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.

Explanation

(i) Vanadate, `VO_(3)^(-)`
Oxidation state of V is + 5.
(ii) Chromate, `CrO_(4)^(2-)`
Oxidation state of Cr is + 6.
(iii) Permanganate, `MnO_(4)^(-)`
Oxidation state of Mn is + 7.