200px stylised lithium atom

Atom Timeline

  • Aristotle
    322

    Aristotle

    384-322 B.C.
    -Stated that empty space cannot exist
    -Had a theory that all matter was made of four elements
    -Elements: Fire, Earth, Water, Air
  • Period: 322 to

    Aristotle

    384-322 B.C.
    -Stated that empty space cannot exist
    -Had a theory that all matter was made of four elements
    -Elements: Fire, Earth, Water, Air
  • Period: 370 to 460

    Democrtius

    460-370 B.C.
    -Came up with the idea of atoms(atomos)
    -Stated that atoms move through empty space
  • Democritus
    400

    Democritus

    460-370 B.C.
    -Came up with the idea of atoms(atomos)
    -Stated that atoms move through empty space
  • John Dalton

    John Dalton

    -Dalton's Atomic Theory
    -6 Statments
    -Stated atoms are indivisble and indestructible
  • Sir William Crookes

    Sir William Crookes

    -Cathode Ray
    -Light came from Cathode Tube
    -Led to the invention of the Television
  • JJ Thomson

    JJ Thomson

    -Founder of the Electron
    -Plum Pudding Model
    -Conducted Experiments with the Cathode Tubes
    -Charge-to-mass ratio
  • Robert Millikan

    Robert Millikan

    -Found out the charge of an Electron is negative
    -The Oil Drop experiment
    -Found the mass of an Electron
  • Ernest Rutherford

    Ernest Rutherford

    -Founder of the Nucleus
    -Gold Foil Experiment
    -Experiment to see how positively charged alpha particles intercated with solid matter.
  • Niels Bohr

    Niels Bohr

    -Quantom Model of the Atom
    -Proposed that Electrons revovle around the Nucleus in stable orbit
  • James Chadwick

    James Chadwick

    -Founder of the Neutron and Proton
    -Refined the concept of the nucleus
    -Showed 2 other subatomic particle, Neutron and Proton, had existed in the nucleus