Among the following series of transition metal ions, the one...

Among the following series of transition metal ions, the one where all metal ion have $3 \mathrm{~d}^{2}$ electronic configuration is a. $\mathrm{Ti}^{3+}, \mathrm{V}^{2-}, \mathrm{Cr}^{3+}, \mathrm{Mn}^{4+}$ b. $\mathrm{Ti}^{+}, \mathrm{V}^{4+}, \mathrm{Cr}^{6+}, \mathrm{Mn}^{7+}$ c. $\mathrm{Ti}^{4+}, \mathrm{V}^{3+}, \mathrm{Cr}^{2+}, \mathrm{Mn}^{3+}$ d. $\mathrm{Ti}^{2+}, \mathrm{V}^{3+}, \mathrm{Cr}^{4+}, \mathrm{Mn}^{5+}$

Among the following series of transition metal ions, the one where all metal ion have $3 \mathrm{~d}^{2}$ electronic configuration is
a. $\mathrm{Ti}^{3+}, \mathrm{V}^{2-}, \mathrm{Cr}^{3+}, \mathrm{Mn}^{4+}$
b. $\mathrm{Ti}^{+}, \mathrm{V}^{4+}, \mathrm{Cr}^{6+}, \mathrm{Mn}^{7+}$
c. $\mathrm{Ti}^{4+}, \mathrm{V}^{3+}, \mathrm{Cr}^{2+}, \mathrm{Mn}^{3+}$
d. $\mathrm{Ti}^{2+}, \mathrm{V}^{3+}, \mathrm{Cr}^{4+}, \mathrm{Mn}^{5+}$

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Key Concepts

d-Orbital Electron Count

The d-electron count in a transition metal ion is crucial for predicting its chemical behavior, magnetic properties, and color. By accounting for the number of electrons removed during ionization, one can determine if a series of ions has a uniform d-electron configuration, as required in some problems.

Order of Electron Removal

When transition metals form ions, electrons are generally removed first from the 4s orbital and then from the 3d orbitals. This reversal relative to the filling order is a key concept that affects the resulting d-electron count in the ion.

Electronic Configuration

Electronic configuration describes how electrons are arranged in the orbitals of an atom. For transition metals, the configuration is particularly significant because the partially filled 3d orbitals are responsible for many of their unique chemical and physical properties.

Ionization and Oxidation States

The process by which an atom loses electrons to form a cation is closely tied to its oxidation state. In transition metals, the oxidation state indicates the number of electrons removed from the neutral atom, which in turn determines the number of electrons remaining in the 3d orbitals.

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