Question:
The Aufbau principle is not correctly obeyed in the ground state electronic configuration of the pair:
The Aufbau principle is not correctly obeyed in the ground state electronic configuration of the pair:
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Half filled and fully filled d subshells give extra stability.
Updated On: Jul 3, 2026
- Cu, Ar
- Cu, Cr
- Cr, Ar
- Co, Zn
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The Correct Option is B
Solution and Explanation
Step 1: Cr predicted [Ar]3d4 4s2, actual [Ar]3d5 4s1 (half-filled stability).
Step 2: Cu predicted [Ar]3d9 4s2, actual [Ar]3d10 4s1 (fully-filled stability).
Step 3: Ar, Co, Zn all match predictions.
\[\boxed{\text{Cu, Cr}}\]Was this answer helpful?
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