Tom Johnstons Atom

By johnst
  • 470

    Democritus

    Democritus
    Democritus claimed that everything is made up of atoms and the atoms are physically but not geometrically indivisible.
    And the atoms are indestructible
  • john Dalton

    john Dalton
  • Sir Joseph John Thomson

    Sir Joseph John Thomson
    he discovered electrons and isotopes and he invented the mass spectrometer. In 1905 he discovered the radioactivity of potassium.In 1906 Thomson demonstrated that hydrogen had only one electron in per atom.
  • Ernest Ruthorford

    Ernest Ruthorford
    His atomic theory was he proved that radioactivity involved the transmutation of one chemical element to another. He also believed that atoms have their charge concentrated in a very small nucleus.
  • Erwin Shrodinger

    Erwin Shrodinger
    His theory was that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.
  • niels Bohr

    niels Bohr
    His atomic theory was the bohr model of an atom with the atomic nucleus at the Centre and electrons in orbit around it which he compared to planets orbiting the sun.
  • James Chadwick

    James Chadwick
    His atomic theory was he made a fundamental discovery in the doorman of nuclear science he proved the existence of neutrons.