The correct ground state electronic configuration of chromium atom is

Chemistry · JEE Advanced · NTA Exams — Atomic Structure

[Ar] 3d⁵ 4s¹
[Ar] 3d⁴ 4s²
[Ar] 3d⁶ 4s⁰
[Ar] 4d⁵ 4s¹

Answer
(A) [Ar] 3 d 5 4 s 1

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