C8 - the periodic table

Question 1

Who developed the Periodic Table?

Answer 1

Dmitri Mendeleev

Question 2

How did Mendeleev initially arrange elements?

Answer 2

By atomic weight

Question 3

What is periodicity?

Answer 3

The repeating patterns in the properties of elements across periods.

Question 4

What do groups in the periodic table represent?

Answer 4

Elements with the same number of valence electrons.

Question 5

What do periods in the periodic table represent?

Answer 5

Elements with the same number of electron shells.

Question 6

What are the three ways to classify elements?

Answer 6

Solids/Liquids/Gases, Metals/Non-Metals, Natural/Synthetic

Question 7

Which two elements are liquids at room temperature?

Answer 7

Mercury and Bromine

Question 8

Where are metals located on the periodic table?

Answer 8

Left and below the stepped line.

Question 9

What is a metalloid?

Answer 9

An element with properties of both metals and non-metals.

Question 10

How does non-metallic character change across a period?

Answer 10

It increases.

Question 11

What trend do elements in the same group show?

Answer 11

Similar chemical properties due to same valence electrons.

Question 12

What trend do elements in the same period show?

Answer 12

Increasing number of outer electrons and changing properties.

Question 13

Which group is known as the alkali metals?

Answer 13

Group I

Question 14

How many valence electrons do alkali metals have?

Answer 14

1

Question 15

How does reactivity change down group I?

Answer 15

Reactivity increases.

Question 16

How does density change down group I?

Answer 16

Density increases.

Question 17

How does melting point change down group I?

Answer 17

Melting point decreases.

Question 18

Why are alkali metals stored under oil?

Answer 18

To prevent reaction with air or water.

Question 19

What gas is produced when alkali metals react with water?

Answer 19

Hydrogen gas

Question 20

What flame color is produced by potassium?

Answer 20

Lilac flame

Question 21

Which group is known as the halogens?

Answer 21

Group VII (7)

Question 22

How many valence electrons do halogens have?

Answer 22

7

Question 23

How does reactivity change down group VII?

Answer 23

Reactivity decreases.

Question 24

How does melting point and density change down group VII?

Answer 24

Both increase.

Question 25

What happens in a halogen displacement reaction?

Answer 25

A more reactive halogen displaces a less reactive one.

Question 26

What is the state and color of chlorine?

Answer 26

Green gas

Question 27

What is the state and color of bromine?

Answer 27

Red-brown liquid

Question 28

What is the state and color of iodine?

Answer 28

Purple solid

Question 29

Where are transition metals found?

Answer 29

In the center block of the periodic table.

Question 30

Do transition metals have high or low melting points?

Answer 30

High melting points (except mercury).

Question 31

What is a common property of transition metal compounds?

Answer 31

They are colored.

Question 32

Why are transition metals used as catalysts?

Answer 32

They speed up reactions without being used up.

Question 33

Name one transition metal catalyst and its use.

Answer 33

Iron in the Haber process.

Question 34

Which group contains the noble gases?

Answer 34

Group 8/0 or Group VIII

Question 35

Why are noble gases unreactive?

Answer 35

They have full outer electron shells.

Question 36

What does monatomic mean?

Answer 36

Consisting of single atoms.

Question 37

Name one use of helium.

Answer 37

Filling balloons or MRI machines.

Question 38

Name one use of neon.

Answer 38

In neon signs.

Question 39

Why is argon used in lightbulbs?

Answer 39

It prevents the filament from reacting.