31 янв 1800 г. до нашей эры - Dalton

Описание:

1766-1844
-Each element is composed of atoms.
-Atoms are neither created or destroyed.
-Atoms can't be subdivided or changed of any other element.
-Atoms of one element differ from mass and other properties from atoms of other elements.
-All atoms of the same element are identical in mass and size.
Atoms of different elements combine in simple whole number ratios.

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