MCQ
Transitional elements exhibit variable valencies because they release electrons from the following orbits:
- A$Ns$ orbit
- B$Ns$ and $np$ orbits
- ✓$(n−1)d$ and $ns$ orbits
- D$(n−1)d$ orbit
✓
Answer
Correct option: C.
$(n−1)d$ and $ns$ orbits
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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