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465
Democritus
http://www.iep.utm.edu/democrit/
In 465BC he created his hypothesis. Hiws hypothesis said that atoms cannot created or destroyed and that they differ in size. He made his first atom theory in 492BC. -
John Dalton
http://www.biography.com/people/john-dalton-9265201
John is known for his early work in the development of the modern atomic theory. He said that all matter is made of atoms. He uncovered the fact that atoms cannot be created or destroyed. He also created the first chart of atomic weights. -
Joesph Jon Thomson
http://www.biography.com/people/jj-thomson-40039
Joesph performed a series of experiments in 1897. He discovered the electron. -
Ernest Rutherford
http://www.biography.com/people/ernest-rutherford-39099
Known as the Father of nuclear physics. He discovered a series of discoveries in the fields of radioactivity and nuclear physics. He postulated the nuclear structure of the atom. He did lots of experiments. One showed that when alpha particles are fired into gas atoms, a few are violently deflected.
