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Q.

Chromium has the electronic configuration  4s13d5 rather than 4s23d4  because

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a

4s and 3d have the same energy

b

4s has a higher energy than 3d

c

4s1  is more stable than   4s2

d

4s13d5  half-filled is more stable than  4s23d4

answer is D.

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Detailed Solution

Cr has [Ar]4s13d5 electronic configuration because half filled orbital are more stable than other orbitals.
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