Consider the ions Co²⁺,Mn²⁺,and Fe³⁺.Which among them has/have an [Ar]3d⁵ electron configuration? A) Co²⁺ only B) Mn²⁺ only C) Fe³⁺ only D) Co²⁺ and Fe³⁺ E) Mn²⁺ and Fe³⁺

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Quizplus · Accepted Answer

Mn²⁺ (Mn^2+) has a [Ar]3d^5 configuration, losing 2 electrons from the 4s orbital. Fe³⁺ (Fe^3+) loses 3 electrons, 2 from the 4s and 1 from the 3d, resulting in a [Ar]3d^5 configuration. Both match the [Ar]3d^5 configuration.

Consider the Ions Co2+,Mn2+,and Fe3+

Consider the Ions Co²⁺,Mn²⁺,and Fe³⁺