alleryIn strong-field octahedral, electron filling order in d-orbitals follows:
ARandom with pairing
BHund's rule fills t2g and eg simultaneously
CRandom
DFills t2g completely first (low spin), then eg
Answer & Solution
Correct answer: D. Fills t2g completely first (low spin), then eg
**Strong-field:** large Δ_oct, so pairing in lower t2g is more favorable than promoting to higher eg.
**Result:** low-spin configurations (e.g., d⁶ as t2g⁶ eg⁰, all paired = diamagnetic).
**Weak-field:** small Δ, Hund's rule favors high-spin.
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