Atomic Theory

By saradechard

  • John Dalton

    John Dalton
    Proposed that elements consisted of atoms that were identical and had the same mass. Also that compounds were atoms from different elements combined together.

  • J.J. Thomson

    J.J. Thomson
    Determined the charge to mass ratio of electrons

  • Rutherford

    Rutherford
    discovered alpha, beta, and gamma rays in radiation

  • Bohr

    Bohr
    proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit

  • Chadwick

    Chadwick
    found that the nucleus aslo included uncharged, or neutral particles, which he called neutrons. He reasoned that the neutrons were important in holding the positively charged protons together.

  • Current Model

    Current Model
    describes a cloud-like region where the electron is likel to be found