Chapter 7.3, Problem 22PP

Interpretation Introduction

Interpretation:

Formula for ionic compound formed by cesium and nitride needs to be determined.

Concept introduction:

Ionic compounds are formed as the result of formation of positive as well as negative ions. Electrons are basically transformed from one atom to other for formation of rare gas electron structure for each ion.

The atom that forms a positive ion will loses electrons to the atom that basically gains electrons for formation of a negative ion.

Answer to Problem 22PP

Formula is ${\text{Cs}}_{\text{3}}\text{N}$.

Explanation of Solution

Formula for the ionic compounds formed by cesium and nitride is ${\text{Cs}}_{\text{3}}\text{N}$.

The charge on Cs ion is +1 and that on N ion is -3 thus, to from neutral compound, 1 mol of N ion should react with 3 mol of Cs ion.

Chemical equation is represented as follows:

$3{\text{Cs}}^{+}+{\text{N}}^{3-}\to {\text{Cs}}_{\text{3}}\text{N}$

Here, 3 electrons from 3 Cs (1 electron each) are transferred to 1 N atom.

The electronic configuration is represented as follows:

Conclusion

Therefore, ${\text{Cs}}_{\text{3}}\text{N}$ is the required formula.