Question 1

A nuclear particle that has about the same mass as aproton, but with no electrical charge, is called a(n)

Accepted Answer

neutron

Answer

nuclide

Answer

proton

Answer

electron

Question 2

The nucleus of most atoms is composed of

Accepted Answer

protons and neutrons

Answer

protons

Answer

neutrons

Answer

protons and electrons

Question 3

isotopes are atoms of the same element that have different

Accepted Answer

number of neutrons

Answer

masses

Answer

number of protons

Answer

number of electrons

Question 4

Atoms of the same element that have different masses are called

Accepted Answer

isotopes

Answer

nuclides

Answer

neutrons

Answer

moles

Question 5

For an electron in an atom to change from the ground state to an excited state

Accepted Answer

energy must be absorbed

Answer

none of the above

Answer

energy must be released

Answer

radiation must be emitted

Question 6

Most of the volume of an atom is occupied by the

Accepted Answer

nucleus

Answer

Protons

Answer

nuclides

Answer

electron cloud

Question 7

Every atom of a given element does not have the same number of

Accepted Answer

neutrons

Answer

protons

Answer

electrons

Answer

atoms

Question 8

All oxygen atoms have 8 protons. How many neutrons does an oxygen-18 have

Accepted Answer

10

Answer

26

Answer

18

Answer

8

Question 9

_________is a visual model of the most likely locations for the electrons in an atom

Accepted Answer

electron cloud

Answer

nucleus

Answer

atomic radius

Answer

all the answers

Question 10

Two atoms of the same element can have different numbers of protons.

Accepted Answer

False

Answer

True

Question 11

Two different elements can have the same atomic number.

Accepted Answer

false

Answer

true

Question 12

The atomic number of an atom is the sum of the protons and neutrons in the nucleus of that atom

Accepted Answer

false

Answer

true

Question 13

When electrons release energy some of the energy may be released as visible light.

Accepted Answer

true

Answer

false

Question 14

Carbon  has an assigned atomic mass of 12.0000. Its % in nature is 98.93%.  The atomic mass of Carbon-13 is 13.0034. Its % in nature is 1.070%. What is the average atomic mass for Carbon?

Accepted Answer

12.0091

Answer

12

Answer

1.200

Answer

.12009

Question 15

A subatomic particle that has a negative electric charge is a(n)

Accepted Answer

electron

Question 16

A subatomic particle that has a positive charge and that is found in the nucleus of an atom is a(n)

Accepted Answer

proton

Question 17

A subatomic particle that has no charge and is found in the nucleus is a(n)

Accepted Answer

neutron

Question 18

The number of protons in the nucleus of an atom is called the

Accepted Answer

atomic number

Question 19

The sum of the numbers of protons and neutrons of the nucleus of an atom is called the

Accepted Answer

mass number

Question 20

A period on the periodic table

Accepted Answer

is a horizontal row

Answer

is also called a column

Answer

contains metals only

Answer

runs up and down

Question 21

An atomic mass unit is

Accepted Answer

a value that depends on the % in nature & the masses of there isotopes

Answer

a value that shows the number of subatomic particles

Answer

a value that contains the atomic number of the element and its isotope

Answer

a value that defines the element

Question 22

What is a group on the periodic table

Accepted Answer

a column with elements that have similar properties

Answer

a row that consists of metals only

Answer

a horizontal row on the periodic table

Answer

a row that consists of gases only

Question 23

What element does this represent

Accepted Answer

Oxygen

Answer

Nitrogen

Answer

Fluorine

Answer

Sulfur

Question 24

What element does this represent

Accepted Answer

Mg

Answer

Na

Answer

Ca

Answer

Al

Question 25

Elements in group 7 are called

Accepted Answer

Halogens

Answer

Metalloids

Answer

gasses

Answer

Nonmetals

Question 26

Alkaline earth metals are in which goup

Accepted Answer

2

Answer

3

Answer

8

Answer

1

Question 27

Elements with properties that fall between less metallic metals and nonmetals are

Accepted Answer

mettalloids

Answer

nonmetals

Answer

gasses

Answer

metals

Question 28

Elements in group 7 are called

Accepted Answer

Halogens

Answer

Metalloids

Answer

Nonmetals

Answer

gasses

Question 29

Calculate the atomic mass of Mg. Isotope 1- 23.985 amu at 78.99%. Isotope 2- 24.986amu at 10.00% and Isotope 3- 25.982 amu at 11.01%.

Accepted Answer

24.31 amu

Answer

2.431 amu

Answer

2431 amu

Answer

.2431 amu

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