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The History of the Atom

By savannah_gibson
  • Period: 450 to

    THE HISTORY OF THE ATOM

  • J.J Thompson

    J.J Thompson
    He discovered that atoms contained negatively and positively charged particles called electrons.

  • Dalton

    Dalton
    All matter consists of tiny particles called atoms
    Atoms could not be divided.
    Atoms of the same element were alike.
    Atoms combined in simple whole number ratios.

  • Rutherford

    Rutherford
    Rutherford proposed that the atom consisted mostly of empty space and a dense nucleus containing positive charges
    Negative charges orbited around the nucleus

  • Bohr

    Bohr
    Bohr modified the model of the atom by suggesting that electrons orbit the nucleus at different energy levels.

  • Chadwick

    Chadwick
    The nucleus contained protons and neutrons and the electrons spun around the outside. he also found that Neutrons are neutral.

  • Democritus

    Democritus
    Democritus suggested that that all substances were made of tiny particles called atoms.
    Essentially, Democritus discovered matter. Democritus believed that atoms made up everything and between atoms was invisible space.