development of the atomic theory

By steveo.10
  • 1856 BCE

    Democritus

    This is Democritus atomic theory is
    All matter consists of invisible particles called atoms.And it makes everything up
    Atoms are solid but invisible because it is very small to the human eye
  • 1766 BCE

    John Dalton

    He came up that atoms are everything it took a long time to know the existence of atoms.

  • J.J. Thomson

    In 1897 Thomson discovered the electron by experimenting with a Crookes He demonstrated that cathode rays were negatively charged. In addition, he also studied positively charged particles in neon gas.

  • Lord Rutherford

    By 1911 he found that atom has a tiny and heavy nucleus and are radivative

  • Niels Bohr

    In 1913 Niels bohr came up with the theory of the atomic and he say they are angry jumps around nucleus and it s a light

  • Sir James Chadwick

    Sir James Chadwick found that atoms are types of energy and named the radiation neutron in the year of 1932

  • current model

    Schrodinger and Heisenberg atomic Model. the key point about the Bohr model that one person made but is no longer accepted in current models of the atom.