The anomalous ground-state electronic configuration of Chromium () is . This exception to the Aufbau — Atomic Structure Chemistry Question
Question
The anomalous ground-state electronic configuration of Chromium ($Cr, Z=24$) is $[Ar] 3d^5 4s^1$. This exception to the Aufbau principle is primarily driven by:
Answer: A
💡 Solution & Explanation
Configurations that are exactly half-filled ($d^5$) possess maximum spatial symmetry and the maximum possible number of parallel spin exchanges, releasing exchange energy that strongly stabilizes the atom.
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