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| In 1803: |
John Dalton (England) formulated the modern version of the atomic theory. In his model:
- Matter is made up of small indivisible particles, called atoms.
- All atoms in a given chemical element are exactly alike, while the atoms of different elements differ by atomic weight.
- Atoms can neither be created nor destroyed.
- A chemical reaction is just a simple rearrangement of atoms and the same number of atoms must be present before and after the reaction.
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