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Which of the following species would contain the greatest number of unpaired electrons?

1. A tetrahedral d6 ion
2. [Co(H2O)6]3+
3. A square-planar d7 ion
4. A coordination compound having a magnetic moment of 5.92 B.M.

Correct answer: A coordination compound having a magnetic moment of 5.92 B.M.

Solution

The magnetic moment of 5.92 B.M. indicates the presence of five unpaired electrons, which is the maximum for a transition metal complex, confirming that this option has the greatest number of unpaired electrons compared to the others.

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