-
300
Greeks
The greeks had a theory that said everything was made up of small particles. -
Dalton
Datlon found out that atoms were solid spheres. This is kind of a theory because nobody can see an atom. -
Rutherfurd
He discovered the nucleus in an atom. He tested this hypothesis when he shot rays through a thin sheet of gold, they bounced back. -
Crooke
Crooke made the C.R.T. Crooke made the C.R.T. that discovered positives and the negtives of an atom. -
Bohr
He said that atoms had orbitz.