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John Dalton
Proposed that the elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together. -
JJ Thompson
Determined the charge to mass ratio of electrons. -
Rutherford
Discovered alpha, beta, and gamma rays in radiation. -
Chadwick
DIvided the nucleus into protons and neutrons -
Bohr
Proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit. -
Modern Atomic Stucture
Describes a cloud-like region where the electron is likely to be found.
