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Solution: Which of these ions has the smallest number of unpaired electrons?V2+Cr2+Ni2+Co2+Fe3+

Problem

Which of these ions has the smallest number of unpaired electrons?

V2+

Cr2+

Ni2+

Co2+

Fe3+

Solution

To determine the number of unpaired electrons in an atom, let’s first write its electron configuration.


You can determine the ground-state electron configuration of electrons by referring to the periodic table and locating their position in the periodic table.

Ground-state means that the element is in its lowest energy form (not in excited state). 


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