E Grace Famous Dead Guy

  • 101

    Thales 624 B.C.

    Thought all things were made of water
  • 101

    Democritus-- 400 B.C

    First person to think of the atom. thought it was a solid sphere.
  • 101

    Aristotle-- 384

    Didn't believe in the Atomic Theory. believed all substances were made of fire, water, earth, and air.
  • Newton

    He agreed with Democritus.
  • Dalton

    Atomic theory. First to have experimental evidence.
  • Henri Becquerel

    discovered reactivity, couldn't explain it.
  • Joseph John Thompson

    discovered the electron
  • Ernest Rutherford

    discovered the nucleus
  • Millikan

    Found the charge of an electron
  • Niels Bohr

    thought electrons orbited around the nucleus
  • Erwin Schrodinger

    atomic model was the quantum mechanical model.
  • James Chadwick

    Proved the exsistence of neutrons.