Engineering Materials in EE
The electron configuration of copper is

 1s2 , 2s2 2p6, 3s2 3p6 3d9, 4s2.
 1s2 , 2s2 2p6, 3s2 3p6 3d10, 4s1.
 none of above.
 1s2 , 2s2 2p6, 3s2 3p6 3d8, 4s1 4p

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