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Calculate the number of unpaired electrons in the following gaseous ions: Mn^3+, Cr^3+, V^3+ and Ti^3+. Which one of these is the most stable in aqueous solution?

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Calculate the number of unpaired electrons in the following gaseous ions: Mn3+, Cr3+, V3+ and Ti3+. Which one of these is the most stable in aqueous solution?

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(i) Mn3+, [Ar]3d4 → 4

(ii) Cr3+, [Ar]3d3 → 3

(iii) V3+, [Ar]3d2 → 2

(iv) Ti3+, [Ar]3d1 → 1

Cr3+ is the most stable in aqueous solutions owing to a t2g3 configuration.

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