Atomic Theory Review

The name Democritus gave us the smallest possible particle of matter is

• molecule

• atom

• electron

• proton

J.J. Thomson discovered the negative charged subatomic particle called the

• neutron

• nucleus

• electron

• proton

The small dense center of the atom is called the

• neutron

• nucleus

• electron

• proton

The nucleus of an atom contains

• neutrons, only

• electrons and neutrons

• protons, only

• protons and neutrons

The positive subatomic particles in the nucleus of an atom are called the

• neutrons

• electrons

• protons

• isotope

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

• mass number

• atomic mass

• configuration

• atomic number

Atoms with the same number of protons, but different number of neutrons are called

• isotopes

• neutral

• ions

• isolines

The sum of the protons and neutrons in an atom is called the

• atomic number

• atomic mass

• mass number

• isotope number

The number of protons in an atomic with an atomic number of 17 is

• 17

• 34

• 18

• 8

Niels Bohr found that electrons move in definite orbits around the

• element

• atom

• nucleus

• sun