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The d & f Block Elements — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
Which of the following is not an actinide?
  • A
    Uranium
  • B
    Curium
  • C
    Californium
  • D
    Erbium
✓

Answer

  1. Erbium

Explanation:

Erbium with atomic number 68, electronic configuration [Xe]4f126s2 belongs to lanthanides.

$\therefore$ Erbium is not an actinide.

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