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

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Which of the following is not an actinide
  • A
    Curium
  • B
    Californium
  • C
    Uranium
  • ✓
    Terbium
✓

Answer

Correct option: D.
Terbium
d
(d)Terbium is lanthanide as it belongs to $4f - $series having configuration $[Xe]4{s^9}6{s^2}$. However the remaining members belong to $5f - $series (actinides).

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