Chapter 10 Vocabulary

Question 1

Atom

Answer 1

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

Question 2

Electron

Answer 2

A subatomic particle that has a negative charge and is found outside of the nucleus.

Question 3

Nucleus

Answer 3

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

Question 4

Electron Cloud

Answer 4

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

Question 5

Proton

Answer 5

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

Question 6

Atomic Mass Unit

Answer 6

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

Question 7

Neutron

Answer 7

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

Question 8

Atomic Number

Answer 8

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

Question 9

Isotope

Answer 9

Two atoms that have the same number of protons(the same atomic number) as the other but a different number of neutrons(and thus a different atomic mass),…

Question 10

Mass number

Answer 10

The sum of the numbers of protons and neutrons in the nucleus of an atom.

Question 11

Atomic Mass

Answer 11

The mass of an atom expressed in atomic mass units.