Chapter 4 review Holt physical science

Question 1

Atoms of elements that are in the same group have the same number of

Accepted Answer

valence electrons

Question 2

Noble gaes are nonreactive gaseous elements that are located in group

Accepted Answer

18

Question 3

Which statement about an element's average atomic mass is correct?

Accepted Answer

It is a weighted average

Question 4

Ionization refers to the process of

Accepted Answer

losing or gaining electrons

Question 5

A region in which there is a high probability of finding an electron is called a nucleus

Accepted Answer

False

Question 6

Which statement about the alkali metals is correct?

Accepted Answer

They are located in the far left column of the periodic tabl

Question 7

Removing one valence electron from an element creates a

Accepted Answer

+1 charge

Question 8

Valence electrons determine an atom's

Accepted Answer

chemical properties

Question 9

Dalton's atomic theory was accepted because

Accepted Answer

There was evidence to support it.

Question 10

The nucleus of an atom has a positive electric charge.

Accepted Answer

True

Question 11

Which statement about noble gases is correct?

Accepted Answer

They do not react to form compounds or molecules

Question 12

An atom's mass number equals the number of

Accepted Answer

protons plus the number of neutrons

Question 13

Group 18 noble gases are inert because

Accepted Answer

their outermost energy level is full

Question 14

A lithium ion is much less reactive than a lithium atom because it

Accepted Answer

has a full outermost energy level

Question 15

Semiconductors are elements that

Accepted Answer

can conduct heat and electricity under certain conditions

Question 16

Atoms of elements in the same group(column) have similar properties because they have the same

Accepted Answer

Number of valence electrons

Question 17

According to bohr's theory, an electrons path around the nucleus defines it's

Accepted Answer

Energy Level

Question 18

The ______ are located in the center of the periodic table

Accepted Answer

Transition metals

Question 19

The order of elements in the periodic table is based on

Accepted Answer

number of protons

Question 20

The order of elements on the periodic table is based on the number of protons

Accepted Answer

True

Question 21

Which statement about the atomic nucleus is correct.

Accepted Answer

it is made of protons and neutrons and has a + charge

Question 22

Neutrons and protons are found in the nucleus of an atom.

Accepted Answer

Ture

Question 23

Avogadro's constant is defined as the number of particles in

Accepted Answer

One mole of a pure substance

Question 24

The charge of an electron is

Accepted Answer

-1

Question 25

A mole is an SI base unit that describes the

Accepted Answer

amount of a substance

Question 26

The _____ is the SI unit that is used for counting small particles, such as atoms.

Accepted Answer

Mole

Question 27

Oxygen's atomic number is 8. This means that an oxygen atom has

Accepted Answer

8 protons

Question 28

According to Bohr's model of the atom, electrons behave like

Accepted Answer

planets orbiting the sun

Question 29

Atoms have no electric charge because they

Accepted Answer

have an equal number of electrons and protons

Question 30

The ______ are highly reactive metals located in Group 17 of the periodic table

Accepted Answer

Halogens

Question 31

The word atom comes from a Greek word that means "able to be divided"

Accepted Answer

False

Question 32

Alkali metals are extremely reactive because they

Accepted Answer

have one valence electron that is easily removed.

Question 33

Which of the follow elements is an alkali metal?

Accepted Answer

Sodium

Question 34

According to modern atomic theory, it is nearly impossible to know an electrons exact

Accepted Answer

position

Question 35

Carbon and other nonmetals are found in which area of the periodic table

Accepted Answer

right side

Question 36

Molar mass is defined as

Accepted Answer

the mass in grams of 1 mole of a substance

Question 37

Group 1 of the periodic table consists of the

Accepted Answer

Alkali metals

Question 38

How many valence electrons do Alkaline-earth metals have

Accepted Answer

2

Chapter 4 review Holt physical science

Questions 38

Chapter 4 review Holt physical science

Questions 38