Which one of the lanthanoids is radioactive in nature?
A
Cs
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B
Np
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C
Ce
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D
Pm
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Solution
The correct option is D Pm Promethium(Pm) is the only element among lanthanoids which is radioactive in nature. Promethium is relatively unstable in itself and there are other more stable isotopes that it can decay to. Thus, answer is option D.