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Matter is described by the following
Earth (Solid)
Water (Liquid)
Fire (Energy)
Air (Gas) -
Cathode Ray Tube (CRT)
Generates electrons -
Discoverd elements & compounds
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Discovered radioactivity
Radiation produced spontaneously by unstable atomic nucleus -
Discovered electrons
Plum Pudding or (chocolate chip) model -
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Electrons orbit in energy levels around the protons in the nucleus
Model of the atom looks like a solar system -
Identified neutron
Same mass as proton
No charge
