Chapter U1.21, Problem 3E

Interpretation Introduction

Interpretation:

Whether the given compounds are possible or not must be explained.

Concept introduction:

A compound is formed such that the overall charge on the compound is neutral.

Answer to Problem 3E

LiCl₂ and MgCl are not possible. LiCl and AlCl₃ are possible.

Explanation of Solution

Aluminium belongs to group 13 with three valence electrons. So it will definitely form Al³ + ion with a valency of 3.

On the other hand, chlorine belongs to halogen family with one valence electron. So it will produce Cl - ion with a valency 1. Thus the compound will be AlCl₃ (aluminium chloride).

Lithium belongs to group 1. It has one valence electron and thus it is expected to form Li + ion. Magnesium belongs to group 2. It has two valence electrons and thus it is expected to form Mg² + ion with valency 2.

Thus expected formula of chloride will be MgCl₂ and LiCl.

A compound must be charge neutral.

Thus LiCl₂ and MgCl will not be formed as there are residual charges.

Conclusion

Thus LiCl₂ and MgCl are not possible. LiCl and AlCl₃ are possible.