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Question 24

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?

Answer
  Gaseous ions Number of unpaired electrons
(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 t32g configuration.

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