-
400
Democristus
500 B.C.
He said that all matter constist of extremly small particles that could NOT be divided.
He came up with it by talking about it with other people. -
450
Aristotle
He said that there was no limit to how many times matter could be divided
He came up with this by talking about this with other people -
John Dalton
He concluded that a gas consists of individual particles
The way he proved this was he did expriments and figured out that no matter wht a gas has a fixed composition -
Ernest Rutherford
He discovered that uranium emits fast moving particles that have fast-moving particles that have a positive charged.
He did an expriment to prove it -
Ernest Marsden
He did the gold foil experiment.He did this experiment to see what the reaction the alpha particles would have to gold foil -
Neils Bohr
He said that electrons move in spherical orbits at a fixed distances from the nucleus. -
J.J. Thomson
He said that the beam was a stream of charged partclies that interacted with the air in the tube and caused the air to glow.
How he came up with this by doing an expriment. In his exprirment he placed a pair of charged metal plates on either side of a glass tube. The plates caused the beam to deflect, or bend, from its striaght path -
Hantaro Nagaoka
He thought that electrons revolve around the positively charged center of the atom like the rings of Saturn. -
Louis de Broglie
He said that moving particles like electrons have some properties of waves. -
Erwin Schrodinger
He devolped mathematical equations to describe the motion of electrons in atoms. -
James Chadwick
He confirms the existence of newtons, wich have no charge.
