Periodic Table Unit 3

Question 1

group 2) are metals with two valence electrons

Answer 1

alkaline earth metals

Question 2

Columns of elements in the periodic table that share similar properties

Answer 2

groups

Question 3

elements, usually solid, with a shiny surface; good conductors of electricity and thermal energy (heat)

Answer 3

metals

Question 4

(group 1 except for Hydrogen) are metals with only one valence electron

Answer 4

alkali metals

Question 5

(group 17) group of elements that are highly reactive; nonmetals; have 7 valence electrons

Answer 5

Halogens

Question 6

(group 18) elements that generally do not react with other elements, and which are all gases; have eight valence electrons, except for helium which has two

Answer 6

Noble gases

Question 7

semimetals, have physical properties of both metals and nonmetal

Answer 7

Metalloids

Question 8

rows of elements in the periodic table arranged by atomic number , energy levels

Answer 8

periods

Question 9

elements that are poor conductors of electricity and heat

Answer 9

nonmetals

Question 10

Characteristics, like size, type, and reactivity of the atoms increase or decrease along a row or column of the periodic table.

Answer 10

periodic trend

Question 11

(groups 3-12) elements that have valence electrons at two different energy levels; do not follow valence rules

Answer 11

Transition Metals

Question 12

the electrons in the outermost energy level of an atom that influence how an element will react with other substances

Answer 12

valence electrons

Question 13

rate at which a chemical substance tends to undergo a chemical reaction

Answer 13

reactivity

Question 14

Elements in the same group have the same number of _____.

Answer 14

valence

Question 15

Elements in the same period have the same number of _____.

Answer 15

energy levels

Question 16

Since elements in the same group have the same valence, they will also have similiar _____ and _____.

Answer 16

properties and reactivity

Question 17

The majority of elements on the periodic table are what type?

Answer 17

metals

Question 18

The elements that are to the right of the zigzag line are called ____.

Answer 18

nonmetals

Question 19

Name the 6 metalloid element symbols.

Answer 19

B, Si, Ge, As, Sb, Te

Question 20

The most NONREACTIVE group is called

Answer 20

Noble Gases

Question 21

Name the two VERY REACTIVE METAL groups

Answer 21

Alkali (1A)

Alkaline Earth Metals (2A)

Question 22

Name the only VERY REACTIVE NONMETAL group.

Answer 22

Halogens (7A)

Question 23

Check the _________ to check an atom’s reactivity.

Answer 23

valence electrons

Question 24

Using a periodic table, decide if this is true or false:

Because Al and Ga are in the same group they will act the same.

Answer 24

True

Question 25

Using a periodic table, decide if this is true or false: Because K and Ca are in the same period, they will act the same.

Answer 25

False. | only elements in the same group act the same.

Question 26

Using a periodic table, decide if this is true or false: Se has more valence electrons than S.

Answer 26

False. They are in the same group so same valence.

Question 27

Using a periodic table, decide if this is true or false: P has fewer protons in its nucleus than S.

Answer 27

True. P has a lower atomic number.

Question 28

Using a periodic table, decide if this is true or false: Te is more like Sb than Se.

Answer 28

False. Te and Se are in the same group, so they are similar. Sb is next door to Te but they have different valence, so different properties.

Question 29

Using a periodic table, decide if this is true or false: Ge and As have the same number of energy levels.

Answer 29

True. They are in the same period.

Question 30

Why is Helium NOT found in group 2 (2A)?

Answer 30

It only has two electrons but that makes the first energy level full, so it is nonreactive and must be found in 8A with the rest of the Noble Gases.

Question 31

Using a periodic table, which choice is most similar to Carbon? Sn, B, Rb, or Ne

Answer 31

Sn - because it is in the same group and will have similar properties and reactivity.

Question 32

Metals are malleable and ductile. What do those words mean?

Answer 32

malleable - can be dented or hammered flat | Ductile - can be pulled into a wire shape