which of the following electron configur...

which of the following electron configurations is correct for copper,(atomic number29)

A

[Ar]`3d^(10)4s^(1)`

B

[Kr]`3d^(9)4s^(1)`

C

[Ar]`3d^(9)4s^(2)`

D

[Kr]`3d^(10)4s^(1)`

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