Which of the following formulas corresponds to the electronic configuration of Cu atom?

Answer options

1. [Ar] 3d7 4s2
2. [Ar] 3d8 4s2
3. [Ar] 3d9 4s2
4. [Ar] 3d10 4s1
5. [Ar] 3d6 4s2

Correct answer

[Ar] 3d10 4s1

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