Easy
The electronic configuration of chromium ($Cr$,$Z=24$) is:
- A$[Ar] 3d^4 4s^2$
- B$[Ar] 3d^5 4s^1$
- C$[Ar] 3d^6 4s^0$
- D$[Ar] 3d^3 4s^2 4p^1$
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