Q.

The electronic configurations of Cr24  and  Cu29 are abnormal

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a

Due to extra stability of exactly half filled and exactly fully filled sub shells

b

Because they belong to d-block

c

Both 1 and 2

d

None of the above

answer is A.

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Detailed Solution

Cr24−1s22s22p63s23p64s23d4(original configuration)but - d5 - it's half-filled state and that is most stable state than other state.Cr24−1s22s22p63s23p64s13d5Cu−1s22s22p63s23p64s23d9  (original configuration)but 1s22s22p63s23p64s13d10  (Full filled state that is most stable than other state)
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The electronic configurations of Cr24  and  Cu29 are abnormal