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Question

Which of the following species has (have) five unpaired electrons?

A
Cs
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B
Mn
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C
Mn2+
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D
Fe2+
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Solution

The correct options are
A Mn
B Mn2+
Mn=1s22s22p63s23p63d54s2
Mn2+=1s22s22p63s23p63d5
Both Mn and Mn2+ have five unpaired electrons because the two electrons removed from Mn2+ is from 4s orbital
Hence, options B & C are correct.

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