The condensed electron configuration for ²⁴Cr is

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴
1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵
[Ar] 4s² 3d⁴
[Ar] 4s¹ 3d⁵

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Chromium is an exception to the expected filling order. One electron is promoted from the 4s orbital to the 3d orbital, giving the more stable configuration [Ar] 4s¹ 3d⁵.

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