The electron configuration for chromium is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁴

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4d⁴

1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 4d⁵

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