Atomic Theory Review

Match it! Select the correct answer from the pull down...Good luck!

Protons have a charge of

What scientist discovered electrons by completing experiments with electricity in empty tubes?

Isotopes are atoms of the same element that have different number of ____________

The mass number of an atom is equal to the number of ____________ in the atom.

A(n) __________ is the smallest subatomic particle, located outside of the nucleus.

Electrons have a charge of

The __________ is a dense, positively charged mass located near the center of the atom.

Neutrons have a charge of