The electronic configuration of Chromium (Cr, Z=24) is an exception to the Aufbau principle. Its actual configuration is 3d⁵4s¹. What is the reason for this exception?

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To achieve a half-filled 3d subshell, which provides extra stability.

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The electronic configuration of Chromium (Cr, Z=24) is an exception to the Aufbau principle. Its actual configuration is 3d⁵4s¹. What is the reason for this exception?

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