Electronic Configuration

Mediumchemistry

The number of unpaired electrons in Fe²⁺ (Z = 26) is:

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Subject: chemistry
Chapter: atomic structure
Topic: electronic configuration
Difficulty: Medium
Year: 2025

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Correct Answer:

Neutral Atom $F e$ ( $Z = 26$ ): $[A r] 3 d^{6} 4 s^{2}$
Ion $F e^{2 +}$ : Electrons are always removed first from the outermost shell ( $n = 4$ ).

$F e^{2 +} = [A r] 3 d^{6}$

Distribution in 3d subshell: Applying Hund's Rule (occupy degenerate orbitals singly first):

$d_{x y}^{2} d_{yz}^{1} d_{z x}^{1} d_{x^{2} - y^{2}}^{1} d_{z^{2}}^{1}$
Orbitals with single electrons: 4
Thus, number of unpaired electrons is 4.

This medium difficulty chemistry question is from the chapter atomic structure, covering the topic of electronic configuration. It appeared in the 2025 exam.

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Electronic Configuration

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