Chapter 4 Introduction to Atoms

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

electrons

Question 3

An atom’s central region, which is made up of protons and electrons.

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

Are positively charged particles in the nucleus.

Answer 5

protons

Question 6

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

Answer 6

atomic 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.

Answer 8

atomic number

Question 9

An atom that has the same number of protons and the different number of neutrons.

Answer 9

isotope

Question 10

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

Answer 10

mass number

Question 11

The mass of an atom expressed in atomic mass units.

Answer 11

atomic mass