-
460B.C.-370B.C.-Atoms comes from atomos meaning uncuttable. He also said all matter consists invisible particles
called atoms -
1766-1844- Dalton came up with the atomic theory that we use today and has five main points.
-
He was the first to order them by atomic mass and he developed the law of octaves
-
Crooke discovered thallium and the first reported sample of helium and made crookes tube.
-
He set up the periodic table from lowest atomic mass to highest and it was vertically aligned
-
He didn't just figure out the electrons float around the nucleus but that they actually have a distinct orbit
-
He is credited for discovering the electron
-
The frist person to split an atom with a particle accelerator and he discovered protons
-
He discovered the neutron
-
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 .
