Atomic Theory Timeline

Front

What is the main conclusion of the Gold Foil Experiment?

Back

Most of the atom is empty space, with a small, dense nucleus at the center.

Front

Who is known for the discovery of the electron?

Back

JJ Thomson.

Front

What device did JJ Thomson use to discover the electron?

Back

The Cathode Ray Tube.

Front

What did Ernest Rutherford propose about the structure of the atom?

Back

The atom has a small, dense nucleus surrounded by mostly empty space.

Front

What is the significance of the nucleus in an atom?

Back

The nucleus contains protons and neutrons, making it the center of mass and positive charge of the atom.

Front

What are the main components of an atom?

Back

Protons, neutrons, and electrons.

Front

What charge do protons carry?

Back

Positive charge.

Front

What charge do electrons carry?

Back

Negative charge.

Front

What is the relative mass of a neutron compared to a proton?

Back

Neutrons and protons have approximately the same mass.

Front

What did Rutherford's model of the atom replace?

Back

The Plum Pudding Model proposed by J.J. Thomson.