-
Democritus is the first man to theorize that everything is made up of atoms.
-
John Dalton brings back the atomic theory.
-
A famous experiment is performed by Crooke. He discovered that cathode rays travel in straight lines and omit heat when they hit certain materials.
-
Becquerel discovers radioactivity when working with Uranium.
-
J.J Thomson discovers electrons and invents the Plum Pudding Model of an atom.
-
Ernest Rutherford's gold foil experiment showed that there is a nucleus inside of an atom, containing a positive charge. All the mass of the atom is found within the nucleus.
-
Discovered by James Chadwick, neutrons are neutral atoms found within the nucleus. He bombarded the alpha rays on Beryilium and came to discover neutrons.
