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Q.

The electronic configuration of copper Cu 29  is

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a

1s22s22p63s23p63d94s2

b

1s22s22p63s23p63d104s1

c

1s22s22p63s23p64s24p6

d

1s22s22p63s23p63d10

answer is B.

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Detailed Solution

3d subshell filled with 10 electrons (fully-filled) is more stable than that filled with 9 electrons. 1, 4s electrons jumps into 3d. subshe!I for more stability.
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