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Ground state electronic configuration of chromium is against to
The Aufbau order would give Cr as $$[\text{Ar}]3d^4 4s^2$$, but the actual configuration is $$[\text{Ar}]3d^5 4s^1$$ because a half-filled $$d$$ subshell is extra stable. This violates the Aufbau principle, while Hund's rule and Pauli's principle are still obeyed.
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