Democritus - Matter is made of small parts called atoms, which are indivisible, Dalton - Atoms of different elements have different properties, Thomson - The atom is mostly positive, with negative particles found inside (chocolate chip cookie), Rutherford - Atoms have protons in the center and are mostly empty space , Bohr - Said that electrons move around the nucleus in specific layers or orbits , Chadwick - Discovered neutrons, Schrodinger - Electrons move in waves. They live in the "electron cloud" outside of the nucleus,

Atomic Theory

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