# of valence electrons on Groups 1, 2, 17 and 18) cations/anions

Question 1

What is the definition of density?

Answer 1

Density is the mass of an object divided by its volume.

Question 2

True or False: Density is a physical property of matter.

Answer 2

True

Question 3

Fill in the blank: The formula for calculating density is ____ = mass/volume.

Answer 3

density

Question 4

What is the unit of measurement for density in the metric system?

Answer 4

grams per cubic centimeter (g/cm³)

Question 5

Which of the following substances has the highest density? A) Water B) Gold C) Air

Answer 5

B) Gold

Question 6

What happens to the density of a substance when it is heated?

Answer 6

Generally, the density decreases as the substance expands.

Question 7

True or False: The density of a substance can change with temperature and pressure.

Answer 7

True

Question 8

What is the density of water at 4°C?

Answer 8

1 g/cm³

Question 9

Short Answer: What is the relationship between mass and volume in terms of density?

Answer 9

Density is directly proportional to mass and inversely proportional to volume.

Question 10

Fill in the blank: A material with a density less than that of water will ____.

Answer 10

float

Question 11

What is the approximate density of air at sea level?

Answer 11

1.225 kg/m³

Question 12

Which property describes a substance’s ability to be hammered into thin sheets?

Answer 12

Malleability

Question 13

True or False: Chemical properties can be observed without changing the substance’s identity.

Answer 13

False

Question 14

What term describes the amount of mass per unit volume?

Answer 14

Density

Question 15

What is the typical density range for metals?

Answer 15

5 to 20 g/cm³

Question 16

Multiple Choice: Which of the following is a chemical property? A) Color B) Reactivity C) Density

Answer 16

B) Reactivity

Question 17

Short Answer: Why do substances with higher densities sink in liquids with lower densities?

Answer 17

Because they displace a smaller volume of liquid than their mass.

Question 18

Fill in the blank: The density of a gas is typically ____ than that of liquids and solids.

Answer 18

lower

Question 19

What is the effect of increasing pressure on the density of gases?

Answer 19

Density increases with increasing pressure.

Question 20

Which physical property describes a substance’s ability to conduct electricity?

Answer 20

Electrical conductivity

Question 21

How many valence electrons do elements in Group 1 have?

Answer 21

1 valence electron

Question 22

What is the number of valence electrons in Group 2 elements?

Answer 22

2 valence electrons

Question 23

True or False: Elements in Group 17 have 7 valence electrons.

Answer 23

True

Question 24

Fill in the blank: Elements in Group 18 have ___ valence electrons.

Answer 24

8 valence electrons

Question 25

Which group has elements that are known as noble gases?

Answer 25

Group 18

Question 26

What is the common characteristic of elements in Group 1?

Answer 26

They all have 1 valence electron.

Question 27

Multiple Choice: How many valence electrons do halogens (Group 17) have? A) 5 B) 6 C) 7 D) 8

Answer 27

C) 7

Question 28

Short Answer: Why do Group 18 elements typically not react with other elements?

Answer 28

They have a full set of valence electrons (8).

Question 29

True or False: Alkali metals are found in Group 2.

Answer 29

False

Question 30

What is the term for the outermost electrons in an atom?

Answer 30

Valence electrons

Question 31

How do the number of valence electrons affect the chemical properties of an element?

Answer 31

They determine how an element will react with other elements.

Question 32

Fill in the blank: The elements in Group 2 are called ___ metals.

Answer 32

alkaline earth

Question 33

Multiple Choice: Which group contains elements that are highly reactive nonmetals? A) Group 1 B) Group 2 C) Group 17 D) Group 18

Answer 33

C) Group 17

Question 34

What is the maximum number of valence electrons an element can have?

Answer 34

8 valence electrons

Question 35

True or False: All elements in Group 1 are metals.

Answer 35

True

Question 36

How many valence electrons do alkaline earth metals (Group 2) have?

Answer 36

2 valence electrons

Question 37

Short Answer: What do elements in Group 1 and Group 2 have in common?

Answer 37

They are both metals and have fewer than 4 valence electrons.

Question 38

Multiple Choice: Which group is least reactive? A) Group 1 B) Group 2 C) Group 17 D) Group 18

Answer 38

D) Group 18

Question 39

Fill in the blank: The elements in Group 1 are known as ___ metals.

Answer 39

alkali

Question 40

True or False: Valence electrons are important for determining the stability of an atom.

Answer 40

True