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460
Democritus
.Leucippus and corried his atomist through further devoping it rather exten sively.
all matter consists of invisble particles atoms differ in size shap mass positon and arrangemnt. -
Dalton
That it was more changes than it was chargers. -
Thomson
electron and used cathaderay tubes to deternine the charge to mass ratice of an electron to be 1.759 coulembs. -
Rutherford
Is a model of the atom devisedby ernest Rutherford directed the famous. -
Bohr
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Heisenberg and Schrodiger
develop auantum mechanics