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4. d and f- block elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Which one of the following is radioactive lanthanide :-
  • A
    $Pu$
  • B
    $Lu$
  • C
    $Eu $
  • ✓
    $ Pm$
✓

Answer

Correct option: D.
$ Pm$
d
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 $D.$

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