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with its homolog tellurium, and at roughly the same time, Ernest Rutherford identified the same activity in his analysis of the uranium decay chain and named it radium F (originally radium E). By 1905, Rutherford concluded that all these observations were due to the same substance, ²¹⁰Po. Further discoveries and the concept of isotopes, first proposed in 1913 by Frederick Soddy, firmly placed ²¹⁰Po

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