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JJ Thompson • Cathode Ray Tube • Provided evidence of electron seven of his research assistants and his son won Nobel Prizes in physics
Ernest Rutherford • Discovered protons jammed together in center of mass • Gold Foil Experiment
Atomic Mass • Protons plus neutrons • 1 proton = 0.00000000000000000000000166053886 g 1 electron = 0.0000000000000000000000000001675g • 1 proton = 1 amu • 1 electron = 0amu • Mass of proton = mass of neutron
Charges • Electron has charge of -1 • Proton has charge of +1 • How many protons and electrons does a neutral atom have?