English chemist who received the Nobel Prize for Chemistry in 1921
for investigating radioactive substances and for elaborating the theory
of isotopes. He is credited, along with others, with the discovery of
the element protactinium in 1917.
Soddy did work with Rutherford on the disintegration of radioactive
elements. He was among the first to conclude in 1912 that certain elements
might exist in forms that differ in atomic weight while being indistinguishable
and inseparable chemically. These, upon a suggestion by Margaret Todd,
he called isotopes. In Science and Life (1920) he pointed out their
value in determining geologic age.
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