History of Atoms timeline.

490 BCE

Democritus

Democritus was an important figure in history because he created the idea of an atom and lead to further discovery.
Period: Dec 18, 1856 to Nov 18, 1962

John Dalton

John Dalton proposed that all matter is composed of atoms. Also all atoms of a given element are identical in mass and properties
Period: Dec 18, 1856 to Aug 30, 1940

J. J Thomson

In 1897, J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube.
Period: Aug 30, 1871 to Oct 19, 1937

Ernest Rutherford

Rutherford discovered that the atomy has a tiny and heavy nucleus
Period: Oct 7, 1885 to Nov 18, 1962

Neils Bohr

Neils Bohr came up with the concept of electrons.
Period: Oct 20, 1891 to Jul 24, 1974

James Chadwick

In 1932 James Chadwick discovered that neutrons have no specific charge and can be found at the core of an atom.

Democritus