Chapter 4.9, Problem 5QQ

Interpretation Introduction

Interpretation:

Among the given options, the variable charge metal has to be chosen.

Concept Introduction:

An ionic compound has two elements one is metal and another one is non-metal.  The metal ion always has positive charge and the non-metal ion always has negative ion called binary compounds.

Example: ${\text{NaCl, CO}}_{\text{2}}$.  Here $\text{NaCl}$ is ionic and carbon dioxide is binary compound.

Depending upon the chemical circumstances metal atoms are able to form more than one type of ion is called variable charge metal.

Example – Fe forms ${\text{Fe}}^{\text{2+}}$ and ${\text{Fe}}^{\text{3+}}$ ion.