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Dalton
Pioneered the atomic wieghts of elements -
Nagaoka
Developed an early "planetary model" of the atom. -
Thompson
Suggested a model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces. -
Rutherford
Discovered that atoms have thier positive charge concentrated in a very small neucleus. -
Chadwick
Proved the existence of neutrons in atoms. -
Bohr
Investegated the structure of atoms and the radiation they eminate
