Final answer:
Manganese (II) ions (Mn²⁺) have a high magnetic moment due to their five unpaired electrons, exhibiting a high-spin configuration, which confirms their high magnetic moment value among the given options. The correct answer is option: B. Mn²⁺
Step-by-step explanation:
One of the transition metal ions that shows a higher spin magnetic moment value is Mn²⁺. In the context of transition metals, the magnetic moment is largely determined by the number of unpaired electrons in the d-orbitals of the ion.
For manganese (II) ions, with a d⁵ electron configuration, there are five unpaired electrons, contributing to a high magnetic moment. This is consistent with Mn²⁺ exhibiting a high-spin configuration in most of its complexes. Conversely, ions like Fe³⁺ can show both high and low spin states depending on the ligand field strength.
High-spin complexes have a maximum number of unpaired electrons, therefore a higher magnetic moment, as opposed to low-spin complexes where electrons are paired up whenever possible, resulting in a reduced magnetic moment.