There are subshells around the nucleus. ...

There are subshells around the nucleus.
Which of the following is the outermost electronic configuration of copper?
(Atomic number=29)
`A : 3d^9 4s^2`
`3d^(10) 4s^1`
Justify your answer.

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`B: 3d^(10) 4s^1`
To attain extra stability

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