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The electron configuration of copper is
Options:
A .   1s2 , 2s2 2p6, 3s2 3p6 3d8, 4s1 4p
B .   1s2 , 2s2 2p6, 3s2 3p6 3d10, 4s1.
C .   none of above.
D .   1s2 , 2s2 2p6, 3s2 3p6 3d9, 4s2.
Answer: Option B
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