Democritus - The idea of an atom; Seashell experiment-Divided a seashell into its smallest comp., Dalton - Atoms do exsist;All matter in the universe is made of indestructible, unchangeable atoms, Thomson - The electron;Cathode ray experiment-Cathode ray tubes., Rutherford - Alpha and beta rays; Gold foil experiment- Proposed the nuclear model of the atom., Bohr - A theory for the hydrogen atom Atomic Hydrogen model-electrons do not radiate energy as they orbit the nucleus, but exist in states of constant energy that he called stationary states. , Chadwick - Neutrons; Beryllium bombardmen-Alpha particles did not have enough energy to produce such powerful gamma-rays, Mendeleev - The periodic law; build up a systematic table of all the 70 elements then known,

Atomic Theory

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