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what is the ground state electronic configuration of a `_(27)` CO atom in the gas phase ?

A

`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(7)4s^(2)`

B

`1s^(2)2s^(2)2p^(6)3s^(6)3d^(9)`

C

`1s^(2)2s^(2)2p^(6)3s^(6)3d^(8)4s^(1)`

D

`1s^(2)2s^(2)2p^(6)3s^(6)3d^(7)4s^(2)`

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