Atomic History

Front

Who proposed that the atom is a small, dense, solid sphere?

Back

John Dalton

Front

Who was the first to propose the idea of atoms?

Back

Democritus

Front

What experiment did J.J. Thomson perform to discover the electron?

Back

The Cathode Ray Experiment.

Front

What experiment did Ernest Rutherford conduct to discover the nucleus?

Back

The Gold Foil Experiment.

Front

Who discovered the electron?

Back

J.J. Thomson

Front

What is the main idea of Dalton's Atomic Theory?

Back

All matter is made of atoms, which are indivisible and indestructible.

Front

What did Democritus believe about atoms?

Back

He believed that atoms are the smallest units of matter and are indivisible.

Front

What did Rutherford's Gold Foil Experiment demonstrate?

Back

It demonstrated that atoms have a small, dense nucleus.

Front

What particle did J.J. Thomson discover?

Back

The electron.

Front

What is the significance of the Cathode Ray Experiment?

Back

It led to the discovery of the electron and the understanding of atomic structure.