Chapter 7, Problem 7.58SP

Interpretation Introduction

(a)

Interpretation:

A formula for an ionic compound should be given using only P, Br and Mg.

Concept introduction:

Ionic bonds form due to the complete loss or gain of one or more electrons resulting in cations and anions. They are held together by electrostatic interactions. In most cases, bonds form between two atoms are not completely ionic but have some covalent character. The magnitude of covalent character and ionic character is determined by the difference between electronegativity of the two atoms. Higher the difference, higher the ionic character.

Interpretation Introduction

(b)

Interpretation:

The formula of the molecular compound having polar covalent bonds needs to be determined. The molecular compound obeys the octet rule and there is no formal charge on it. Concept introduction:

When an atom has a different number of electrons than the number of valence electrons, then the atom has either gained or removed electrons. So, that particular atom bears a formal charge. The formal charge can be calculated by following formula.

$\text{Formal charge = No}\text{. of valence electrons - }\frac{1}{2}\text{ No}\text{. of bonding electrons - No}\text{. of nonbonding electrons}$