The Modifications of Dalton’s Atomic Theory
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:
In the 2nd Step ??? atoms of a given element are NOT always identical (isotopes).
In the 5th Step??? atoms CAN be divided further (3 subatomic particles: protons, electrons, and neutrons).