Question

Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.

Answer 1

Upto the element Mn, the oxidation state leading to the maximum stability corresponds to value equal to sum of s-a nd d-electron i.e, the group number. For Example,
`[Sc(III)O_(2)]^(-),[Ti(IV)O_(3)]^(2-),[V(V)O_(4)]^(2-),[Mn(VII)O_(4)]^(-)`
However, for the remaining elements, the oxidation states are not related to their group numbers.