Atomic Theory Review

Front

What did Niels Bohr prove about electrons?

Back

Electrons are in energy levels.

Front

What determines the identity of an atom?

Back

Protons.

Front

Who claimed that matter was made of small, hard particles called 'atomos'?

Back

Democritus.

Front

What was the conclusion of Rutherford's gold-foil experiment?

Back

Most of the atom is empty.

Front

What did J.J. Thomson prove about atoms?

Back

There are electrons.

Front

What is the nucleus of an atom?

Back

The central part of an atom that contains protons and neutrons.

Front

What are isotopes?

Back

Atoms of the same element with different numbers of neutrons.

Front

What is the charge of a proton?

Back

Positive.

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.