Atomic Theory and Periodic Practice December 11

Front

What did Thomson discover?

Back

Electron

Front

Subatomic particles with a negative charge are called?

Back

Electrons

Front

Which scientist thought all life was made up of four elements?

Back

Aristotle

Front

What is the tiny, dense, positively charged portion of the atom that holds most of the atomic mass?

Back

Nucleus

Front

Why are models used to study atoms?

Back

Because atoms are very small.

Front

What is the center of an atom called?

Back

Nucleus

Front

What are the three main subatomic particles?

Back

Protons, Neutrons, Electrons

Front

What charge do protons carry?

Back

Positive charge

Front

What charge do neutrons carry?

Back

No charge (neutral)

Front

What is the overall charge of an atom?

Back

Neutral, because it has equal numbers of protons and electrons.