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)