Chapter 2, Problem 91RQ

Interpretation Introduction

Interpretation:

The formulas for the ionic compounds formed between the pair of given elements are to be written.

Concept Introduction:

An ionic compound consists of ions that have electrostatic interaction between them which is termed as ionic bonding.

The element symbols and subscripts in an ionic compound are represented by a chemical formula.

While writing the chemical formula for an ionic compound, the symbol of the metal is written first, which is followed by the symbol of the non-metal.

Formal charge equation can be given as:

$\begin{array}{l}\text{Formal charge }=\text{ number of valence electrons }-\text{1}/\text{2 number of shared electrons}\\ - \text{number of unshared electrons}\end{array}$ or

$F=Z-\left(\text{1}/\text{2}\right)S-\text{ U}$

where $F$ is the formal charge, $Z$ is the group number of the element, $S$ equals the number of shared electrons, and $\text{U}$ is the number of unshared electrons.

The arithmetic sum of all the formal charges in a molecule or ion will equal the overall charge on the molecule or ion.