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Q.

The electronic configuration of Cr(Z =24) is taken as 1s22s22p63s23p63d54s1 instead of 1s22s22p63s23p63d44s2 due to the following in the first case

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a

higher exchange energy

b

higher symmetry of electronic distribution

c

smaller coulombic repulsion energy

d

all of the above

answer is A.

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Detailed Solution

As number of unpaired electrons increases , exchange energy increases and stability increases.
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