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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
Transitional elements exhibit variable valencies because they release electrons from the following orbits:
  • A
    Ns orbit
  • B
    Ns and np orbits
  • C
    (n−1)d and ns orbits
  • D
    (n−1)d orbit
✓

Answer

  1. (n−1)d and ns orbits

Explanation:

The ability of the transition metals to exhibit variable valency is generally attributed to the availability of more electrons in the (n−1)d orbitals which are closer to the outermost ns orbital in energy levels.

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