What is the maximum number of unpaired electrons in an octahedral complex of a transition metal ion?

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Consider the question about the maximum number of unpaired electrons in an octahedral complex of a transition metal ion, which centers on the d-electron configuration in an octahedral field.
Option a: '6' would require an ion to have six unpaired electrons. In an octahedral field, a maximum of five unpaired electrons can be accommodated in the d-orbitals (one per orbital in the five d-orbitals) if every orbital is singly occupied. However, due to electron pairing tendencies and the specific splitting between t2g and eg sets, reaching six unpaired electrons is not possible for a single transition metal ion in octahedral coordination under typical ligand field considerations.
Option b: '3' suggests only three unpaired electrons. While some d-electron configurations may yield three unpaired electrons in particular ligand fields or oxidation states, 'three' is not the maximum; we can have configurations with five unpaired electrons (as in high-spin d5), so this option underestimates the potential maximum.
Option c: '8' would imply more unpaired electrons than there are available d-orbitals (there are only five d-orbitals to be singly occupied in the absence of pairing), so eight unpaired electrons is not physically feasible for a single metal ion in an octahedral field.
Option d: '5' corresponds to the maximal situation where each of the five d-orbitals contains one unpaired electron, as can occur for a high-spin d5 configuration in an octahedral field. This is the practical maximum because there are only five d-orbitals to fill, and the most unpaired electrons attainable is one per orbital, giving five.
In summary, the options explore common misconceptions: overshooting the number of d-orbitals, undercounting, or imagining an unphysical scenario. The physically realizable ceiling for unpaired electrons in an octahedral complex is five, achieved in high-spin d5 cases. The other options do not respect the five-orbital limit or the spin-state possibilities inherent to octahedral splitting.

CHM1052 - MUM S2 2025 CHM1052 2022 practice exam 2

What is the maximum number of unpaired electrons in an octahedral complex of a transition metal ion?

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