23 oct 1803 año - John Dalton
Descripción:
John Dalton takes what Democritus said about the atom and says that:Elements are made of extremely small particles called atoms.
Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
Atoms cannot be subdivided, created, or destroyed.
Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
In chemical reactions, atoms are combined, separated, or rearranged.
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23 oct 1803 año
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~ 222 years ago