-
450 BCE
Democratus
He wondered what would happen if you cut a piece of anything smaller and smaller and discovered the "Atom-Atomos". -
Period: 450 BCE to
History of the Atom
-
John Dalton
John Dalton showed that a compound always consists of the same elements in the same ratio. Dalton also showed different compounds always consist of different elements or ratios. -
JJ Thomson
Thomson’s experiments showed that an electric current consists of flowing, negatively charged particles. -
Ernest Rutherford
Rutherford Discovered the nucleus. In 1911, he used alpha particles to study atoms. He aimed a beam of alpha particles at a very thin sheet of gold foil. Outside the foil, he placed a screen of material that glowed when alpha particles struck it.
