John Dalton (1 ene 1766 año – 1 ene 1844 año)

Descripción:

John Dalton was an English philosopher that lived from 1766-1844. Dalton's Atomic Theory (1808) stated that elements are pure (one-of-a-kind) and consist of atoms; that all atoms of an element have the same mass; and that all elements are different. Additionally, he defined "compound" and said they have a fixed ratio of atoms and that chemical reactions involve rearranging of combination of atoms.

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