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The Models of the Atom • 400 B.C.- Democritus - matter could not be divided - he used the Greek word atomos which means indivisible •384-322 B.C. – Aristotle- believed in the four elements of air, earth, water and fire. Aristotle felt that regardless of the number of times you cut a form of matter in half, you would always have a smaller piece of that matter. This view held for 2000 years primarily because Aristotle was the tutor of Alexander the Great. • 1800-1900 – Dalton- according to his Dalton Atomic Theory he came up with the Billiard Ball Model – atoms are solid and indivisible •1900 – Thompson – Plum pudding model (raisin bun) – negative electrons in a positive framework • 1910- Rutherford – atoms are mostly empty space- negative electrons orbit a positive nucleus Watch movie clip Bohr - electrons orbit the nucleus in shells, and electrons can be bumped up to a higher shell if energized