Atomic Theory

Front

What is the basic unit of matter?

Back

Atoms

Front

What is the central region of an atom called?

Back

Nucleus

Front

Who discovered the electron?

Back

J.J. Thomson

Front

What are the two types of particles found in the nucleus of an atom?

Back

Neutrons and protons

Front

What is the charge of an electron?

Back

Negatively charged

Front

What is the charge of a proton?

Back

Positively charged

Front

What is the charge of a neutron?

Back

Neutral (no charge)

Front

Which scientist proposed the first atomic theory?

Back

John Dalton

Front

What is the significance of Ernest Rutherford's gold foil experiment?

Back

It provided evidence for the existence of a nucleus in the atom.

Front

What model of the atom did Niels Bohr propose?

Back

The Bohr model, which describes electrons orbiting the nucleus in fixed paths.