![]() ![]() In the 5th Step➞ atoms CAN be divided further (3 subatomic particles: protons, electrons, and neutrons). In the 2nd Step ➞ atoms of a given element are NOT always identical (isotopes). Today, some 215 years after John Dalton proposed his Atomic Theory of Matter in 1808, there are just two modifications that must be made: Dalton’s Atomic Theory Modifications: = The Modifications of Dalton’s Atomic Theory He is best known for introducing the atomic theory into chemistry, and for his research into colour blindness, which he had.
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