Calculate the number of unpaired electrons in the following gaseous ions
`i) Mn^(3+) ii) Cr^(3+) iii) V^(3+) iv) Ti^(3+)`
Which one of these is the most stable in aqueous solution ?

Explanation

`Cr^(3+)` is the most stable in aqueous solution because it has half filled level (i.e., `t_2 g^3`).