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

Atomic Theory

Found small particles inside the atom thus atoms could be divided into smaller parts

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

Suggested that electrons travel around the nucleus in definite paths. States that electrons can jump between levels

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

contains protons (+) and neutrons (neutral).

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

represents the number of protons or electrons an element has

represents the mass of the protons + neutrons

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