Chapter 4, Problem 4A

Interpretation Introduction

Interpretation: In a nomenclature of ionic compound, which element is named first has to be explained.

Concept introduction: An ionic compound that contains only two elements, one present as a cation and one as an anion, is called a binary ionic compound.

Answer to Problem 4A

Cation name is placed first in nomenclature of ionic compounds.

Explanation of Solution

Cations are formed when metals oxidize. Oxidation of metal is as follows:

  $\text{M}\to {\text{M}}^{\text{n+}}+{\text{ne}}^{-}$

Where,

  $\text{M}$ is metal.

  ${\text{M}}^{\text{n+}}$ is metal ion

  $\text{n}$ is oxidation state of metal ion or number of electron lost.

As per the rules for nomenclature, cation name is placed first.

Conclusion

Cation name is placed first in nomenclature of ionic compounds.