A) Uranium
B) Thorium
C) Aluminium
D) Polonium
Correct Answer: C
Solution :
Aluminium does not exhibit natural radioactivity. Radioactivity occurs in unstable atomic nuclei, the ones that don?t have enough binding energy to hold the nucleus together due to excess of either protons or neutrons. Polonium, Thorium and Uranium are all radioactive elements.You need to login to perform this action.
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