Groups and Periods

Question 1

Identify the group.

Answer 1

Group 1

Hydrogen is a unique element that does not fit neatly into any specific group.

It is often placed in Group 1 since it has one valence electron like the alkali metals, but it is not a metal itself.

Question 2

Identify the group.

Answer 2

Group 18

There are a total of 18 groups making up the periodic table, listed from left to right.

Question 3

Identify the group.

Answer 3

Group 1

Lithium belongs to Group 1, known as the alkali metals.

Elements in this group have one valence electron and exhibit similar chemical properties.

Question 4

Identify the group.

Answer 4

Group 2

Beryllium belongs to Group 2, known as the alkaline earth metals.

Elements in this group have two valence electrons and exhibit similar chemical properties.

Question 5

Identify the group.

Answer 5

Group 13

Boron belongs to Group 13 of the periodic table.

Elements in this group have three valence electrons and exhibit more diverse chemical properties.

Question 6

Identify the group.

Answer 6

Group 14

Carbon belongs to Group 14, known as the carbon family (excluding flerovium).

Elements in this group have four valence electrons and exhibit diverse chemical properties.

Question 7

Identify the group.

Answer 7

Group 15

Nitrogen belongs to Group 15 of the periodic table, known as the pnictogens.

Elements in this group have five valence electrons and exhibit diverse chemical properties.

Question 8

Identify the group.

Answer 8

Group 16

Oxygen belongs to Group 16 of the periodic table, known as the chalcogens.

Elements in this group have six valence electrons and exhibit diverse chemical properties.

Question 9

Identify the group.

Answer 9

Group 17

Fluorine belongs to Group 17, known as the halogens.

Elements in this group have seven valence electrons and exhibit similar chemical properties.

Question 10

Identify the group.

Answer 10

Group 18

There are a total of 18 groups making up the periodic table, listed from left to right.

The 18th group are known as the noble gases and have full valence electron shells.

Question 11

Identify the group.

Answer 11

Group 1

Sodium belongs to Group 1, known as the alkali metals.

Elements in this group have one valence electron and exhibit similar chemical properties.

Question 12

Identify the group.

Answer 12

Group 2

Magnesium belongs to Group 2, known as the alkaline earth metals.

Elements in this group have two valence electrons and exhibit similar chemical properties.

Question 13

Identify the group.

Answer 13

Group 13

Aluminium belongs to Group 13 of the periodic table.

Elements in this group have three valence electrons and exhibit diverse chemical properties.

Question 14

Identify the group.

Answer 14

Group 14

Silicon belongs to Group 14, known as the carbon group or ‘family’.

Elements in this group have four valence electrons and exhibit diverse chemical properties.

Question 15

Identify the group.

Answer 15

Group 15

Phosphorus belongs to Group 15 of the periodic table, known as the pnictogens.

Elements in this group have five valence electrons and exhibit diverse chemical properties.

Question 16

Identify the group.

Answer 16

Group 16

Sulphur belongs to Group 16 of the periodic table, known as the chalcogens.

Elements in this group have six valence electrons and exhibit diverse chemical properties.

Question 17

Identify the group.

Answer 17

Group 17

Chlorine belongs to Group 17, known as the halogens.

Elements in this group have seven valence electrons and exhibit similar chemical properties.

Question 18

Identify the group.

Answer 18

Group 18

Argon is located in Group 18 of the periodic table, known as the noble gases.

Elements in this group have a full valence shell.

Question 19

Identify the group.

Answer 19

Group 1

Potassium belongs to Group 1, known as the alkali metals.

Elements in this group have one valence electron and exhibit similar chemical properties.

Question 20

Identify the group.

Answer 20

Group 2

Calcium belongs to Group 2, known as the alkaline earth metals.

Elements in this group have two valence electrons and exhibit similar chemical properties.

Question 21

Identify the group.

Answer 21

Group 3

Scandium belongs to Group 3 of the periodic table, and is part of the transition metals.

Elements in this group have diverse chemical properties.

Question 22

Identify the group.

Answer 22

Group 4

Titanium belongs to Group 4 of the periodic table, and is part of the transition metals.

Elements in this group have diverse chemical properties.

Question 23

Identify the group.

Answer 23

Group 5

Vanadium belongs to Group 5 of the periodic table, and is part of the transition metals.

Elements in this group have diverse chemical properties.

Question 24

Identify the group.

Answer 24

Group 6

Chromium belongs to Group 6 of the periodic table, and is part of the transition metals.

Elements in this group have diverse chemical properties.

Question 25

# Identify the group.

Answer 25

**Group 7** ## Footnote Manganese belongs to Group 7 of the periodic table, and is part of the *transition metals*. Elements in this group have diverse chemical properties.

Question 26

# Identify the group.

Answer 26

**Group 8** ## Footnote Iron belongs to Group 8 of the periodic table, and is part of the *transition metals*. Elements in this group have diverse chemical properties.

Question 27

# Identify the group.

Answer 27

**Group 9** ## Footnote Cobalt belongs to Group 9 of the periodic table, and is part of the *transition metals*. Elements in this group have diverse chemical properties.

Question 28

# Identify the group.

Answer 28

**Group 10** ## Footnote Nickel belongs to Group 10 of the periodic table, and is part of the *transition metals*. Elements in this group have diverse chemical properties.

Question 29

# Identify the group.

Answer 29

**Group 11** ## Footnote Copper belongs to Group 11 of the periodic table, and is part of the *transition metals*. Elements in this group have diverse chemical properties.

Question 30

# Identify the group.

Answer 30

**Group 12** ## Footnote Zinc is classified as a *transition metal* and belongs to Group 12 of the periodic table. Elements in this group commonly exhibit a +2 oxidation state.

Question 31

# Identify the group.

Answer 31

**Group 13** ## Footnote Gallium is a *post-transition metal* and belongs to Group 13 of the periodic table. Elements in this group have three valence electrons and exhibit both metal and nonmetal properties.

Question 32

# Identify the group.

Answer 32

**Group 14** ## Footnote Germanium is a *metalloid* and belongs to Group 14 of the periodic table. Elements in this group have four valence electrons and can display both metallic and nonmetallic behavior.

Question 33

# Identify the group.

Answer 33

**Group 15** ## Footnote Arsenic is a *metalloid* and belongs to Group 15 of the periodic table. Elements in this group have five valence electrons and can act as either a metal or nonmetal.

Question 34

# Identify the group.

Answer 34

**Group 16** ## Footnote Selenium is a *nonmetal* and belongs to Group 16 of the periodic table, known as the *chalcogens*. Elements in this group have six valence electrons and exhibit diverse chemical properties.

Question 35

# Identify the group.

Answer 35

**Group 17** ## Footnote Bromine belongs to Group 17 of the periodic table, known as the *halogens*. Elements in this group have seven valence electrons and are highly reactive.

Question 36

# Identify the group.

Answer 36

**Group 18** ## Footnote Krypton is a *noble gas* and belongs to Group 18 of the periodic table. Elements in this group have completely filled valence electron shells and exhibit minimal reactivity.

Question 37

# Identify the group.

Answer 37

**Group 1** ## Footnote Rubidium is an *alkali metal* and belongs to Group 1 of the periodic table. Elements in this group have one valence electron and are highly reactive.

Question 38

# Identify the group.

Answer 38

**Group 2** ## Footnote Strontium is an *alkaline earth metal* and belongs to Group 2 of the periodic table. Elements in this group have two valence electrons and are less reactive than the alkali metals.

Question 39

# Identify the group.

Answer 39

**Group 3** ## Footnote Yttrium is a *transition metal* and belongs to Group 3 of the periodic table. Elements in this group exhibit a variety of oxidation states.

Question 40

# Identify the group.

Answer 40

**Group 4** ## Footnote Zirconium is a *transition metal* and belongs to Group 4 of the periodic table. Elements in this group exhibit a variety of oxidation states.

Question 41

# Identify the group.

Answer 41

**Group 5** ## Footnote Niobium is a *transition metal* and belongs to Group 5 of the periodic table. Elements in this group can exhibit a variety of oxidation states.

Question 42

# Identify the group.

Answer 42

**Group 6** ## Footnote Molybdenum is a *transition metal* and belongs to Group 6 of the periodic table. Elements in this group have six valence electrons and exhibit a variety of oxidation states.

Question 43

# Identify the group.

Answer 43

**Group 7** ## Footnote Technetium is a *transition metal* and belongs to Group 7 of the periodic table. Elements in this group can exhibit a variety of oxidation states.

Question 44

# Identify the group.

Answer 44

**Group 8** ## Footnote Ruthenium is a *transition metal* and belongs to Group 8 of the periodic table. Elements in this group exhibit various oxidation states.

Question 45

# Identify the group.

Answer 45

**Group 9** ## Footnote Rhodium is a *transition metal* and belongs to Group 9 of the periodic table. Elements in this group exhibit a variety of oxidation states.

Question 46

# Identify the group.

Answer 46

**Group 10** ## Footnote Palladium is a *transition metal* and belongs to Group 10 of the periodic table. Elements in this group exhibit a variety of oxidation states.

Question 47

# Identify the group.

Answer 47

**Group 12** ## Footnote Cadmium is classified as a *transition metal* and belongs to Group 12 of the periodic table. Elements in this group have two valence electrons and commonly exhibit a +2 oxidation state.

Question 48

# Identify the group.

Answer 48

**Group 13** ## Footnote Indium is a *post-transition metal* and belongs to Group 13 of the periodic table. Elements in this group have three valence electrons and exhibit both metal and nonmetal properties.

Question 49

# Identify the group.

Answer 49

**Group 14** ## Footnote Tin is a *post-transition metal* and belongs to Group 14 of the periodic table. Elements in this group have four valence electrons and can display both metallic and nonmetallic behavior.

Question 50

# Identify the group.

Answer 50

**Group 15** ## Footnote Antimony is a *metalloid* and belongs to Group 15 of the periodic table. Elements in this group have five valence electrons and can act as either a metal or nonmetal.

Question 51

# Identify the group.

Answer 51

**Group 16** ## Footnote Tellurium is a *metalloid* and belongs to Group 16 of the periodic table. Elements in this group have six valence electrons and can act as either a metal or nonmetal.

Question 52

# Identify the group.

Answer 52

**Group 17** ## Footnote Iodine belongs to Group 17 of the periodic table, known as the *halogens*. Elements in this group have seven valence electrons and are highly reactive.

Question 53

# Identify the group.

Answer 53

**Group 18** ## Footnote Xenon is a *noble gas* and belongs to Group 18 of the periodic table. Elements in this group have completely filled valence electron shells and exhibit minimal reactivity.

Question 54

# Identify the group.

Answer 54

**Group 1** ## Footnote Caesium is an *alkali metal* and belongs to Group 1 of the periodic table. Elements in this group have one valence electron and are highly reactive.

Question 55

# Identify the group.

Answer 55

**Group 2** ## Footnote Barium is an *alkaline earth metal* and belongs to Group 2 of the periodic table. Elements in this group have two valence electrons and are less reactive than the alkali metals.

Question 56

# Identify the group.

Answer 56

**Group 3** ## Footnote This placement of the lanthanides is based on the condensed version of the periodic table. It is represented usually by a single cell like this, with the individual lanthanide elements being placed in a separate row below the main table along with the actinide series.

Question 57

# Identify the group.

Answer 57

**Group 4** ## Footnote Hafnium is a *transition metal* and belongs to Group 4 of the periodic table. Elements in this group exhibit a variety of oxidation states.

Question 58

# Identify the group.

Answer 58

**Group 5** ## Footnote Tantalum is a *transition metal* and belongs to Group 5 of the periodic table. Elements in this group exhibit a variety of oxidation states.

Question 59

# Identify the group.

Answer 59

**Group 6** ## Footnote Tungsten is a *transition metal* and belongs to Group 6 of the periodic table. Elements in this group exhibit a variety of oxidation states.

Question 60

# Identify the group.

Answer 60

**Group 7** ## Footnote Rhenium is a *transition metal* and belongs to Group 7 of the periodic table. Elements in this group exhibit a variety of oxidation states.

Question 61

# Identify the group.

Answer 61

**Group 8** ## Footnote Osmium belongs to Group 8 of the periodic table, and is a *transition metal*. Elements in this group exhibit similar chemical properties.

Question 62

# Identify the group.

Answer 62

**Group 9** ## Footnote Iridium is a *transition metal* and belongs to Group 9 of the periodic table. Elements in this group exhibit a variety of oxidation states.

Question 63

# Identify the group.

Answer 63

**Group 10** ## Footnote Platinum belongs to Group 10 of the periodic table, and is a *transition metal*. Elements in this group exhibit similar chemical properties.

Question 64

# Identify the group.

Answer 64

**Group 11** ## Footnote Gold belongs to Group 11 of the periodic table, and is a *transition metal*. Elements in this group exhibit similar chemical properties.

Question 65

# Identify the group.

Answer 65

**Group 12** ## Footnote Mercury belongs to Group 12 of the periodic table, and is a *transition metal*. Elements in this group have two valence electrons and exhibit similar chemical properties.

Question 66

# Identify the group.

Answer 66

**Group 13** ## Footnote Thallium belongs to Group 13 of the periodic table, and is a *post-transition metal*. Elements in this group have three valence electrons and exhibit similar chemical properties.

Question 67

# Identify the group.

Answer 67

**Group 14** ## Footnote Lead belongs to Group 14 of the periodic table, known sometimes as the *carbon group*. Elements in this group have four valence electrons and exhibit similar chemical properties.

Question 68

# Identify the group.

Answer 68

**Group 15** ## Footnote Bismuth belongs to Group 15 of the periodic table, known as the *pnictogens*. Elements in this group have five valence electrons and exhibit diverse chemical properties.

Question 69

# Identify the group.

Answer 69

**Group 16** ## Footnote Polonium belongs to Group 16 of the periodic table, known as the *chalcogens*. Elements in this group have six valence electrons and exhibit diverse chemical properties.

Question 70

# Identify the group.

Answer 70

**Group 17** ## Footnote Astatine belongs to Group 17 of the periodic table, known as the *halogens*. Elements in this group have seven valence electrons and exhibit diverse chemical properties.

Question 71

# Identify the group.

Answer 71

**Group 18** ## Footnote Radon belongs to Group 18 of the periodic table, known as the *noble gases*. Elements in this group have eight valence electrons and exhibit low chemical reactivity.

Question 72

# Identify the group.

Answer 72

**Group 1** ## Footnote Francium belongs to Group 1 of the periodic table, known as the *alkali metals*. Elements in this group have one valence electron and exhibit highly reactive properties.

Question 73

# Identify the group.

Answer 73

**Group 2** ## Footnote Radium belongs to Group 2 of the periodic table, known as the *alkaline earth metals*. Elements in this group have two valence electrons and exhibit reactivity with water.

Question 74

# Identify the group.

Answer 74

**Group 3** ## Footnote The actinide series belongs to Group 3 of the periodic table, when presented in the condensed form.

Question 75

# Identify the group.

Answer 75

**Group 4** ## Footnote Rutherfordium belongs to Group 4 of the periodic table, and is a *transition metal* but not enough data has been obtained to know its exact properties.

Question 76

# Identify the group.

Answer 76

**Group 5** ## Footnote Dubnium belongs to Group 5 of the periodic table, and is a *transition metal* but not enough data has been obtained to know its exact properties.

Question 77

# Identify the group.

Answer 77

**Group 6** ## Footnote Seaborgium belongs to Group 6 of the periodic table, and is a *transition metal* but not enough data has been obtained to know its exact properties.

Question 78

# Identify the group.

Answer 78

**Group 7** ## Footnote Bohrium belongs to Group 7 of the periodic table, and is a *transition metal* but not enough data has been obtained to know its exact properties.

Question 79

# Identify the group.

Answer 79

**Group 8** ## Footnote Hassium belongs to Group 8 of the periodic table, and is a *transition metal* but not enough data has been obtained to know its exact properties.

Question 80

# Identify the group.

Answer 80

**Group 9** ## Footnote Meitnerium belongs to Group 9 of the periodic table, and is considered a *transition metal* but not enough data has been obtained to know its exact properties.

Question 81

# Identify the group.

Answer 81

**Group 10** ## Footnote Darmstadtium belongs to Group 10 of the periodic table, and is considered a *transition metal* but not enough data has been obtained to know its exact properties.

Question 82

# Identify the group.

Answer 82

**Group 11** ## Footnote Roentgenium belongs to Group 11 of the periodic table, and is considered a *transition metal* but not enough data has been obtained to know its exact properties.

Question 83

# Identify the group.

Answer 83

**Group 12** ## Footnote Not enough data has been obtained to know its exact properties.

Question 84

# Identify the group.

Answer 84

**Group 13** ## Footnote Not enough data has been obtained to know its exact properties.

Question 85

# Identify the group.

Answer 85

**Group 14** ## Footnote Not enough data has been obtained to know its exact properties.

Question 86

# Identify the group.

Answer 86

**Group 15** ## Footnote Not enough data has been obtained to know its exact properties.

Question 87

# Identify the group.

Answer 87

**Group 16** ## Footnote Not enough data has been obtained to know its exact properties.

Question 88

# Identify the group.

Answer 88

**Group 17** ## Footnote Not enough data has been obtained to know its exact properties.

Question 89

# Identify the group.

Answer 89

**Group 18** ## Footnote Not enough data has been obtained to know its exact properties.

Question 90

# Identify the period.

Answer 90

**Period 1** ## Footnote Hydrogen is located in Period 1 of the periodic table. Elements in this period have their first energy level occupied by electrons.

Question 91

# Identify the period.

Answer 91

**Period 1** ## Footnote Helium is located in Period 1 of the periodic table. Elements in this period have their first energy level occupied by electrons.

Question 92

# Identify the period.

Answer 92

**Period 2** ## Footnote Lithium is located in Period 2 of the periodic table. Elements in this period have their second energy level occupied by electrons.

Question 93

# Identify the period.

Answer 93

**Period 2** ## Footnote Beryllium is located in Period 2 of the periodic table. Elements in this period have their second energy level occupied by electrons.

Question 94

# Identify the period.

Answer 94

**Period 2** ## Footnote Boron is located in Period 2 of the periodic table. Elements in this period have their second energy level occupied by electrons.

Question 95

# Identify the period.

Answer 95

**Period 2** ## Footnote Carbon is located in Period 2 of the periodic table. Elements in this period have their second energy level occupied by electrons.

Question 96

# Identify the period.

Answer 96

**Period 2** ## Footnote Nitrogen is located in Period 2 of the periodic table. Elements in this period have their second energy level occupied by electrons.

Question 97

# Identify the period.

Answer 97

**Period 2** ## Footnote Oxygen is located in Period 2 of the periodic table. Elements in this period have their second energy level occupied by electrons.

Question 98

# Identify the period.

Answer 98

**Period 2** ## Footnote Fluorine is located in Period 2 of the periodic table. Elements in this period have their second energy level occupied by electrons.

Question 99

# Identify the period.

Answer 99

**Period 2** ## Footnote Neon is located in Period 2 of the periodic table. Elements in this period have their second energy level occupied by electrons.

Question 100

# Identify the period.

Answer 100

**Period 3** ## Footnote Sodium is located in Period 3 of the periodic table. Elements in this period have their third energy level occupied by electrons.

Question 101

# Identify the period.

Answer 101

**Period 3** ## Footnote Magnesium is located in Period 3 of the periodic table. Elements in this period have their third energy level occupied by electrons.

Question 102

# Identify the period.

Answer 102

**Period 3** ## Footnote Aluminium is located in Period 3 of the periodic table. Elements in this period have their third energy level occupied by electrons.

Question 103

# Identify the period.

Answer 103

**Period 3** ## Footnote Silicon is located in Period 3 of the periodic table. Elements in this period have their third energy level occupied by electrons.

Question 104

# Identify the period.

Answer 104

**Period 3** ## Footnote Phosphorus is located in Period 3 of the periodic table. Elements in this period have their third energy level occupied by electrons.

Question 105

# Identify the period.

Answer 105

**Period 3** ## Footnote Sulphur is located in Period 3 of the periodic table. Elements in this period have their third energy level occupied by electrons.

Question 106

# Identify the period.

Answer 106

**Period 3** ## Footnote Chlorine is located in Period 3 of the periodic table. Elements in this period have their third energy level occupied by electrons.

Question 107

# Identify the period.

Answer 107

**Period 3** ## Footnote Argon is located in Period 3 of the periodic table. Elements in this period have their third energy level occupied by electrons.

Question 108

# Identify the period.

Answer 108

**Period 4** ## Footnote Potassium is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 109

# Identify the period.

Answer 109

**Period 4** ## Footnote Calcium is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 110

# Identify the period.

Answer 110

**Period 4** ## Footnote Scandium is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 111

# Identify the period.

Answer 111

**Period 4** ## Footnote Titanium is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 112

# Identify the period.

Answer 112

**Period 4** ## Footnote Vanadium is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 113

# Identify the period.

Answer 113

**Period 4** ## Footnote Chromium is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 114

# Identify the period.

Answer 114

**Period 4** ## Footnote Manganese is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 115

# Identify the period.

Answer 115

**Period 4** ## Footnote Iron is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 116

# Identify the period.

Answer 116

**Period 4** ## Footnote Cobalt is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 117

# Identify the period.

Answer 117

**Period 4** ## Footnote Nickel is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 118

# Identify the period.

Answer 118

**Period 4** ## Footnote Copper is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 119

# Identify the period.

Answer 119

**Period 4** ## Footnote Zinc is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 120

# Identify the period.

Answer 120

**Period 4** ## Footnote Gallium is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 121

# Identify the period.

Answer 121

**Period 4** ## Footnote Germanium is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 122

# Identify the period.

Answer 122

**Period 4** ## Footnote Arsenic is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 123

# Identify the period.

Answer 123

**Period 4** ## Footnote Selenium is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 124

# Identify the period.

Answer 124

**Period 4** ## Footnote Bromine is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 125

# Identify the period.

Answer 125

**Period 4** ## Footnote Krypton is located in Period 4 of the periodic table. Elements in this period have their fourth energy level occupied by electrons.

Question 126

# Identify the period.

Answer 126

**Period 5** ## Footnote Rubidium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 127

# Identify the period.

Answer 127

**Period 5** ## Footnote Strontium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 128

# Identify the period.

Answer 128

**Period 5** ## Footnote Yttrium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 129

# Identify the period.

Answer 129

**Period 5** ## Footnote Zirconium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 130

# Identify the period.

Answer 130

**Period 5** ## Footnote Niobium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 131

# Identify the period.

Answer 131

**Period 5** ## Footnote Molybdenum is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 132

# Identify the period.

Answer 132

**Period 5** ## Footnote Technetium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 133

# Identify the period.

Answer 133

**Period 5** ## Footnote Ruthenium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 134

# Identify the period.

Answer 134

**Period 5** ## Footnote Rhodium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 135

# Identify the period.

Answer 135

**Period 5** ## Footnote Palladium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 136

# Identify the period.

Answer 136

**Period 5** ## Footnote Cadmium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 137

# Identify the period.

Answer 137

**Period 5** ## Footnote Indium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 138

# Identify the period.

Answer 138

**Period 5** ## Footnote Tin is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 139

# Identify the period.

Answer 139

**Period 5** ## Footnote Antimony is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 140

# Identify the period.

Answer 140

**Period 5** ## Footnote Tellurium is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 141

# Identify the period.

Answer 141

**Period 5** ## Footnote Iodine is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 142

# Identify the period.

Answer 142

**Period 5** ## Footnote Xenon is located in Period 5 of the periodic table. Elements in this period have their fifth energy level occupied by electrons.

Question 143

# Identify the period.

Answer 143

**Period 6** ## Footnote Caesium is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 144

# Identify the period.

Answer 144

**Period 6** ## Footnote Barium is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 145

# Identify the period.

Answer 145

**Period 6** ## Footnote The lanthanide series is located in Period 6 of the periodic table, but is visually represented in a separate row below the rest of the table along with the actinide series. Elements in this period have their sixth energy level occupied by electrons.

Question 146

# Identify the period.

Answer 146

**Period 6** ## Footnote Hafnium is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 147

# Identify the period.

Answer 147

**Period 6** ## Footnote Tantalum is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 148

# Identify the period.

Answer 148

**Period 6** ## Footnote Tungsten is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 149

# Identify the period.

Answer 149

**Period 6** ## Footnote Rhenium is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 150

# Identify the period.

Answer 150

**Period 6** ## Footnote Osmium is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 151

# Identify the period.

Answer 151

**Period 6** ## Footnote Iridium is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 152

# Identify the period.

Answer 152

**Period 6** ## Footnote Platinum is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 153

# Identify the period.

Answer 153

**Period 6** ## Footnote Gold is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 154

# Identify the period.

Answer 154

**Period 6** ## Footnote Mercury is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 155

# Identify the period.

Answer 155

**Period 6** ## Footnote Thallium is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 156

# Identify the period.

Answer 156

**Period 6** ## Footnote Lead is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 157

# Identify the period.

Answer 157

**Period 6** ## Footnote Bismuth is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 158

# Identify the period.

Answer 158

**Period 6** ## Footnote Polonium is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 159

# Identify the period.

Answer 159

**Period 6** ## Footnote Astatine is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 160

# Identify the period.

Answer 160

**Period 6** ## Footnote Radon is located in Period 6 of the periodic table. Elements in this period have their sixth energy level occupied by electrons.

Question 161

# Identify the period.

Answer 161

**Period 7** ## Footnote Francium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 162

# Identify the period.

Answer 162

**Period 7** ## Footnote Radium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 163

# Identify the period.

Answer 163

**Period 7** ## Footnote The actinide series is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 164

# Identify the period.

Answer 164

**Period 7** ## Footnote Rutherfordium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 165

# Identify the period.

Answer 165

**Period 7** ## Footnote Dubnium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 166

# Identify the period.

Answer 166

**Period 7** ## Footnote Seaborgium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 167

# Identify the period.

Answer 167

**Period 7** ## Footnote Bohrium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 168

# Identify the period.

Answer 168

**Period 7** ## Footnote Hassium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 169

# Identify the period.

Answer 169

**Period 7** ## Footnote Meitnerium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 170

# Identify the period.

Answer 170

**Period 7** ## Footnote Darmstadtium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 171

# Identify the period.

Answer 171

**Period 7** ## Footnote Roentgenium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 172

# Identify the period.

Answer 172

**Period 7** ## Footnote Copernicium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 173

# Identify the period.

Answer 173

**Period 7** ## Footnote Nihonium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 174

# Identify the period.

Answer 174

**Period 7** ## Footnote Flerovium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 175

# Identify the period.

Answer 175

**Period 7** ## Footnote Moscovium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 176

# Identify the period.

Answer 176

**Period 7** ## Footnote Livermorium is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 177

# Identify the period.

Answer 177

**Period 7** ## Footnote Tennessine is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.

Question 178

# Identify the period.

Answer 178

**Period 7** ## Footnote Oganesson is located in Period 7 of the periodic table. Elements in this period have their seventh energy level occupied by electrons.