20 gen 1803 anni - John Dalton "Dalton's Law"

Descrizione:

1. "Elements are made of extremely small particles called atoms.
2. "Atoms of a given element are identical in size, mass and other properties; atoms of different elements differ in size, mass and other properties.
3. "Atoms cannot be subdivided, created or destroyed.
4. "Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
5. "In chemical reactions, atoms are combined, separated or rearranged."

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