History of atom

Aristotle

440 BC
440 BC

Democritus

400 BC
400 BC
400 BC
400 BC

John Dalton

1803
1803
1803
1804
1804
1804
1804
1804

Thompson

1897
1897
1897
1897
1897

Millikan

1909
1909
1909

Rutherford

1900
1900
1900
1900
1900
1900

Bohr

1913

Chadwick

1932
1932