Atoms scientists

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Stated that electrons do not travel in definite paths, in fact the exact path of a moving electron cannot be predicted. Predicted regions called electron clouds

represents the number of protons or electrons an element has

represents the mass of the protons + neutrons

contains protons (+) and neutrons (neutral).

orbit the nucleus of the atom. Electrons have a negative charge

Atomic Theory

“Atomic Shooting Gallery” He aimed positively charged particles at a thin sheet of gold foil.

Proposed that you would end up with an “uncuttable” particle. He called this particle an atom (from the greek word atomos – meaning indivisible)