Atomic Theory Through the Ages

By MikeandLeti234
  • Aug 25, 1000

    Democritus

    Democritus
    Democritus suggested matter could not be infinitely divided.
    Came up with the term "atom"
    (460-370 B.C.)
  • Aug 25, 1001

    Aristotle

    Aristotle
    Disagreed with Democritus' idea that atoms move through empty space.
    Denied existence of atoms due to personal beliefs
    (384-322 B.C.)

  • John Dalton

    John Dalton
    "Atoms are the smallest particles of matter and are indevisible and indestructable"

  • J.J. Thompson

    J.J. Thompson
    Needs to determine the mass of single cathode ray particle
    Concludes that the mass of the particle was much less than the Hydrogen atom, which disproved Dalton's theory that atoms were indivisible.
    Discovers electons
    (1856-1940)

  • Robert Milikan

    Robert Milikan
    Develops oil drop apparatus to determine the charge of the electron
    discovers that and elecron is equal to -1
    (1868- 1953)

  • Ernest Rutherford

    Ernest Rutherford
    Concludes that there is a nucleus
    Discovers Protons and Neutrons