Chapter 3.5, Problem 3.13E

(a)

Interpretation Introduction

Interpretation:

The oxidation number for atoms in ${\text{Mg}}_{\text{3}}{\text{N}}_{\text{2}}$ has to be assigned.

Concept introduction:

Oxidation number:

The oxidation number of an element is zero. The oxidation number of a monoatomic ion equals its charge.

The oxidation number is zero for the summation of the oxidation numbers complete atoms in a complete formula.

The charge on the ion is equal to the summation of the oxidation numbers of complete atoms in poly atomic ion.

The oxidation state of alkali metal $(\text{Li, Na, K, Rb, Cs})$ is $+1$, and alkaline earth metal is $\text{(Be, Mg, Ca, Sr, Ba)}$ is $+2$.

The oxidation state of hydrogen is $+1$ (without bonding with metals), the oxidation state of oxygen is $-2$.

(b)

Interpretation Introduction

Interpretation:

The oxidation number for all atoms in ${\text{ClF}}_{\text{3}}$ has to be assigned.

Concept introduction:

Refer to part (a)

(c)

Interpretation Introduction

Interpretation:

The oxidation number for all atoms in ${\text{NH}}_{\text{4}}{\text{NO}}_{\text{3}}$ has to be assigned.

Concept introduction:

Refer to part (a)