MCQ
Transitional elements exhibit variable valencies because they release electrons from the following orbits:
- ANs orbit
- BNs and np orbits
- C(n−1)d and ns orbits
- D(n−1)d orbit
✓
Answer
- (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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