-
400
Democritus
460B.C.-370B.C.-Atoms comes from atomos meaning uncuttable. He also said all matter consists invisible particles
called atoms -
Dalton
1766-1844- Dalton came up with the atomic theory that we use today and has five main points. -
John Newlands
He was the first to order them by atomic mass and he developed the law of octaves -
Crooke
Crooke discovered thallium and the first reported sample of helium and made crookes tube. -
Mendeleev
He set up the periodic table from lowest atomic mass to highest and it was vertically aligned -
Bohr
He didn't just figure out the electrons float around the nucleus but that they actually have a distinct orbit -
JJ Thomson
He is credited for discovering the electron -
Rutherford
The frist person to split an atom with a particle accelerator and he discovered protons -
Chadwick
He discovered the neutron -
Aristotle
384-322B.C.-Aristotle agreed there was a smallest part but that it wasn’t the atom, he believed in that their were only four elements .
