Atomic Timeline JJDS

By WarrenSMS
  • 340

    Aristolte

    Aristolte
    Matter is composed of the elements: Earth, Fire, Air or Water
  • 440

    democitus

    democitus
    atoms are 'uncuttable'

  • Dalton

    Dalton
    Atoms of different elements are different

  • Dalton

    Dalton
    He conducted experiments in combining elements and found they combine in specific ratios

  • J.J. Thomson

    J.J. Thomson
    There are small, negatively charged particles inside an atom

  • Thomson

    Thomson
    He conducted the cathode-ray tube experiment.

  • Rutherford

    Rutherford
    Most of an atom's mass is in the nucleus

  • Rutherford

    Rutherford
    There is a small, dense, positively charged nucleus.

  • Rutherford

    Rutherford
    Atoms contain mostly empty space

  • Bohr

    Bohr
    Electrons can jump from a path in one level to a path in another level.

  • bohr

    bohr
    electrons travel in certain paths, or energy levels.

  • James Chadwick

    James Chadwick
    Confirmed the presence of a neutral particle in the nucelus.