History of the Atom

Front

All matter is made of?

Back

Atoms

Front

What is a particle with one negative charge called?

Back

Electron

Front

What is the center of an atom called?

Back

Nucleus

Front

What did J.J. Thomson discover about atoms?

Back

Atoms contain negatively charged particles.

Front

What is the charge of a proton?

Back

Positive

Front

What is the charge of a neutron?

Back

Neutral

Front

What is the charge of an electron?

Back

Negative

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus.

Front

What is an isotope?

Back

Atoms of the same element with different numbers of neutrons.