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Science - The Contributions of Different Scientists to Atomic Theory

By l33la
  • 400 BCE

    Democritus

    Democritus
    the first discovery of the atom

  • John Dalton

    John Dalton
    Found that each element consisted of its own brand of indivisible atom

  • JJ Thompson

    JJ Thompson
    Discovered that atoms were made up of smaller components, which he called ‘corpuscles’ (that later became known as ‘electrons’)

  • Ernest Rutherford

    Ernest Rutherford
    Found that the atom is mostly empty space, with nearly all of its mass concentrated in a central tiny nucleus

  • Niels Bohr

    Niels Bohr
    Produced a model of the atom in which the electron was able to occupy only certain orbits around the nucleus.

  • James Chadwick

    James Chadwick
    the discovery of a neutron