Among the , , and transition series, the frequency of elements exhibiting anomalous electronic configurations (involving the transfer of electrons to or from -orbitals) is highest in which series?

Question

Among the $3d$, $4d$, and $5d$ transition series, the frequency of elements exhibiting anomalous electronic configurations (involving the transfer of electrons to or from $s$ -orbitals) is highest in which series?

Prashant Kotian · Accepted Answer

Correct answer: B. The series exhibits the maximum number of anomalous configurations (, , , , , ). This happens because the energy difference between the and orbitals is extremely small, making it very easy for electrons to shift in order to maximize exchange energy and attain higher stability.

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