Red Seal Hairstylist Practice Exam

Which atom has the electron configuration [Ar] 3d⁵ 4s¹?

V Cr Mn Fe

Correct Answer:

Explanation:

Chromium is an exception to the Aufbau principle; it fills the 4s and 3d subshells with one electron each to achieve a more stable half-filled 3d subshell.

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