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AQUO
Frederick Soddy
Frederick Soddy (1877-1956)
proposed the idea of isotopes in
1912 (note this was close to 30 years after Dalton's original idea)
Isotopes are atoms of the same element having
different masses, due to varying numbers of
neutrons.
Soddy won the Nobel Prize in
Chemistry in 1921 for his work with
isotopes and radioactive materials.