atomic timeline

Front

This particle balances the charges from the protons to make the atom neutral

Back

Electron

Front

Nuclear model proposed by which scientist?

Back

Rutherford

Front

J.J. Thomson provided evidence that an atom contains what?

Back

Negatively charged particles

Front

Who discovered the electron?

Back

Thomson

Front

These particles are found in the nucleus: protons and electrons, nucleus and neutrons, protons and neutrons, or electrons and neutrons?

Back

Protons and neutrons

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 model describes the atom as having a dense nucleus surrounded by electrons?

Back

Rutherford's model

Front

Who proposed the planetary model of the atom?

Back

Bohr