Chemistryhard · Past Paper
What is the correct subshell electronic configuration for Copper (At. No. 29)?
A[Ar] 4s2 3d9
B[Ar] 4s1 3d10
C[Ar] 4s2 3d10
D[Ar] 4s0 3d11
✓ Correct Answer: B — [Ar] 4s1 3d10
Copper has an exceptional configuration where an electron moves from 4s to 3d to achieve a completely filled d-subshell.
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