1 янв 1803 г. - John Dalton Discovery

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He introduced the idea that
- matter is made up of atoms
- atoms are indivisible and indestructible
- All atoms of an element are identical
- Atoms of different elements have different weights and different chemical properties
- Atoms cannot be created or destroyed. When a compound decomposes, the atoms are unchanged.
Experiments with gases that first became possible in the 19th century, led him to propose a modern theory of the atom.

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