Democritus: Atoms can't be cut, Atomos= uncuttable, Atoms are small bits of matter, 430 B.C, John Dalton: All elements made of atoms , Atoms of same element have same mass, Chemical reactions do not change atoms, Compounds , J.J. Thomson: Electrons, Ernest Rutherford: Protons, Nucleus, Niels Bohr: Electrons travel in orbits around nucleus, Each orbit has specific energy level, Cloud Model: Electrons move all directions in cloudlike area, Today's Model: James Chadwick, Neutrons discovered,

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