Chapter 4

Question 1

The smallest unit of an element that maintains the properties of that element.

Answer 1

Atom

Question 2

A subatomic particle that has a negative charge

Answer 2

Electron

Question 3

In physical science, an atom’s central region, which is made up of protons and neutrons.

Answer 3

Nucleus

Question 4

A region around the nucleus of an atom where electrons are likely to be found.

Answer 4

Electron Cloud

Question 5

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

Answer 5

Protons

Question 6

A unit of mass that describe the mass of an atom or molecule.

Answer 6

Atom Mass Unit

Question 7

A subatomic particle that has no charge and that is found in the nucleus of an atom.

Answer 7

Neutron

Question 8

The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element.

Answer 8

Atomic Number

Question 9

An atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons (and thus a different atomic mass)

Answer 9

Isotope

Question 10

The sum of the number of proton and neutrons in the nucleus of an atom.

Answer 10

Mass Number

Question 11

The mass of an atom expressed in atomic mass units.

Answer 11

Atomic Mass