Question:
Why there is exeption in electronic configuration of cr
Answer:
Electronic configuration of Cr is [Ar]3d5 4s1, instead of the expected [Ar]3d4 4s2.
This is so because half filled d orbitals have extra stability. So in case of Cr, one electron from the 4s orbital goes to the 3d orbital to make it half filled, and Cr attains extra stable state.
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