Periodic table 2

4.1 and 4.2

By Awalters12303
  • 370 BCE

    Democritus

    Democritus
    Was among the first theologists to suggest the existence of atoms

  • John Dalton

    John Dalton
    Created the atomic theory

  • Eugen Goldstein

    Eugen Goldstein
    Found evidenced that proved that positively charged atoms, protons, did exist.

  • J.J. Thomson

    J.J. Thomson
    discovered the electron

  • Robert A. Millikan

    Robert A. Millikan
    Performed experiments to find the measurement of the elementary electric charge

  • Ernest Rutherford

    Ernest Rutherford
    Discovered the atom is empty except for is nucleus which is made up of protons and neurons, and tested the plum- putting model, and composed the gold foil experiment.

  • James Chadwick

    James Chadwick
    Proved the existence of the non- charged particle the neutron