Question

The occurrence of which of these radioactive element is rarest in nature

Answer 1

Naturally occurring promethium was eventually detected from extremely rare radioactive decays of europium-151 and uranium. Astatine (85) is considered therarest of the natural elements in the Earth's crust. It is aradioactive element with short-lived isotopes.


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Answer 2

Answer:

Uranium I don't know who a uniform so please mark as brain