Atomic Theory

Democitus

360

Born- 460 BC
Died-370 BC
Career-Philosopher
What contribution was ?The atoms in Democritus theory themselves remain unchanged, but move about in space to combine in various ways to form all macroscopic objects.

Atomic Theory

Oct 7, 1800

John Dalton

Jul 27, 1844

Born- September 6, 1766
Died- July 27, 1844
Career- He discovered the certain gases
How they came to this conclusion?
Dalton came up with this theory as a result of his research into gases

J.J. Thomson

Dec 18, 1856

Born-December 18, 1856
Died-August 30, 1940
Career-J.J. Thomson's insights led to the discovery of the electron and other breakthroughs related to atomic structure.
What contributuon was? J.J. Thomson discovered the electron
How they came to there conclusion?
Thomson came to many of the same conclusions before he did.

Bohr

Oct 7, 1885

Born- October 7, 1885
Died- November 18, 1962
What contribution was? His contribution to the field of physics has received remarkable praise from many
How they came to this conclusion-He came to this conclusion by using a cathode ray scope