Q.

Which of the following electron configurations is correct for copper (atomic number 29)?

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a

[Ar]3d104s1

b

[Kr]3d94s1

c

[Ar]3d94s2

d

[Kr]3d104s1

answer is A.

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Detailed Solution

The anomalous electronic configurations of copper (atomic number 29) is[Ar] 3d104s1
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