Answer to Question #126800 in General Chemistry for Andile

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Question text
Three of the four ions shown below have the same electron configuration but the fourth does not. Identify the one that does not match.


Select one:
a.
Mn2+
b.
Fe2+
c.
Cr+
d.
Fe3+

Answer 1

b. Fe⁺² (Answer)

Electron configuration of four ions is

Mn⁺² (1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵), Fe⁺² (1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶), Cr⁺¹ (1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵) and Fe⁺³ (1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵).