Which among the following elements is radioactive?

Which among the following elements is radioactive?
  1. Lu
  2. Nd
  3. Eu
  4. $\mathrm{Pm}$

Solution

Promethium $(\mathrm{Pm})$ is the only radioactive lanthanide.

Asked in: MHT CET 2020 (20 Oct Shift 1)

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