Who first proposed the atomic theory of matter? ...
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John Dalton is the answer.
A theory of chemical combination, first stated by John Dalton in 1803. It involves the following postulates:
(1) Elements consist of indivisible small particles (atoms).
(2) All atoms of the same element are identical; different elements have different types of atom.
(3) Atoms can neither be created nor destroyed as they were created at the time of big bang.
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