Atom

Scientest

By taylorajeffries
  • 400

    Democritus

    Democritus
    400 B.C

    he made first model of atom .
  • 400

    Aristotle

    Aristotle
    400 B.C
    he opposed Democritus' theory . he thought only 4 elements were in everything . ( earth , fire , air, water , )
  • 500

    Leucippus

    500 BC . He thought everything was made up of something .

  • Isaac Newton

    Isaac Newton
    3 laws of motion

  • John Dalton

    John Dalton
    1. All matter is made of atoms
    2. all atoms of the same element are the same , atoms made of different elements are different
    3. Atoms combine to make compounds
    4. Atoms are rearrange .

  • JJ Thomson

    JJ Thomson
    discovered the electron and made the plum pudding model
    he used the cathode ray tube to discover electron .

  • Ernest Rutherford

    Ernest Rutherford
    said atoms have positive charges in a small , dense nucleus .
    'gold foil experiment'

  • Niels Bohr

    Niels Bohr
    said electrons travel on rings , the more the rings , the higher the energy level . they can move from ring to ring but it takes energy .

  • Schroedinger

    Schroedinger
    Described a cloud - like region where an electron is likely to be found

  • John Chadwick

    John Chadwick
    Discovered the Nuetron .

  • Thales of Miletus

    585 BC . Thales noticed static , which paved for future discoveries .