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

$Mn{O}_4^{-}:$ Mn has +7 oxidation number and group number is 7.

$Cr{O}_4^{2-}:$ Cr has +6 oxidation state and group number is 6.

${VO}_3^{-}:$ V has +5 oxidation state and the group number is 5.