First slide

Quantum mechanical model of the atom

Question

Which of the following species has/have five unpaired electrons?

Moderate

A

Cr
B

Cr³⁺
C

Mn²⁺
D

Fe³⁺

Solution

Mn=1s² 2s²2p⁶ 3s²3p⁶4s² 3d⁵
Mn⁺²=1s² 2s² 2p⁶3s² 3p6 4s⁰3d⁵ =5 unpaired electrons
Fe=1s² 2s² 2p⁶3s2 3p⁶ 4s2 3d⁶
Fe⁺³ =1s2 2s²2p6 3s² 3p⁶ 4s⁰ 3d⁵ =5 unpaired electrons

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