Chapter 4, Problem 48QP

Give the oxidation numbers for the underlined atoms in the following molecules and ions: ${\text{(a) Mg}}_{\text{3}}{\underset{\_}{\text{N}}}_{\text{2}}\text{, (b) Cs}{\underset{\_}{\text{O}}}_{\text{2}}\text{,(c)Ca}{\underset{\_}{\text{C}}}_{\text{2}}\text{,(d)}\underset{\_}{\text{C}}{\text{O}}_{\text{3}}^{\text{2-}}\text{, (e) }{\underset{\_}{\text{C}}}_{\text{2}}{\text{O}}_{\text{4}}^{\text{2-}}\text{, (f) Zn}{\underset{\_}{\text{O}}}_{\text{2}}^{\text{2-}}\text{, (g) Na}\underset{\_}{\text{B}}{\text{H}}_{\text{4}}\text{, (h) }\underset{\_}{\text{W}}{\text{O}}_{\text{4}}^{\text{2-}}$