-
460
Democritus (460- 370 B.C.)
Thought of the Atomic Theory, thought that everything was made of something (atoms). -
Jan 1, 600
Thales (600 B.C.)
He thought that everything was made of something (water). -
Issacc Newton
All atoms moved -
Dalton
Water exists in the air as an independent gas.
1.) Element made of atom
2.) same atom same characteristic, differ atoms differ size
3.)atoms are indestructable
4.) combine in whole # ratios to form chemical compounds
5.) chemical reactions, combined, seperated, and rearranged. -
Antwan herni Becqueral
Discovered radioactivity
Uranium Expirement -
J.J. Thompson
Had the Cathode Rays tube to help in experiment
discovered the Electron, and the fact that atoms are not solid -
Ernest Ruthford
Discovered the nucleus is made of protons surronded by electrons -
Robert Milikan
Determined teh charge and the mass of a nuetron -
Gold Foil Experiment
Alpha particle + nuetron = scattered -
Bohr
Electrons are on fixed paths -
Francis Aston
Discovered Isotopes mass, Spectometer -
Schrondinger
The quantum Model; probability of an Electron path by math electrons -
James Chadwick
evidence towards the existence of Nuetrons -
Aristotle (384-322 B.C.)
Denied the atomic theory. thought that everything was made up of Earth, Wind, Fire, and Water