John Arnold Cranston
20th century Scottish chemist / From Wikipedia, the free encyclopedia
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Dr John Arnold Cranston FRSE FRIC LLD (15 August 1891 – 25 April 1972) was a Scottish research chemist. He is credited with the development of isotopes and also the co-discovery of protactinium (element 91). However this credit was claimed by others, not himself directly, and only caused controversy in the scientific world after the publishing of his obituary.[1]