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The electronic configuration of Cu (atomic number 29) is:

1. 1s2, 2s2 2p6, 3s2 3p6, 4s2 3d9
2. 1s2, 2s2 2p6, 3s2 3p6 3d10, 4s1
3. 1s2, 2s2 2p6, 3s2 3p6, 4s2 4p6, 5s2 5p1
4. 1s2, 2s2 2p6, 3s2 3p6, 4s2 4p6 3d9

Correct answer: 1s2, 2s2 2p6, 3s2 3p6 3d10, 4s1

Solution

Copper (Cu) has an exceptional electronic configuration due to the stability of a fully filled 3d subshell. Instead of 4s2 3d9, it adopts 4s1 3d10.

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