The formula unit for the compound formed when each pairs of ions interact are as mentioned below-
Li⁺ and 0²⁻ forms Li2O
Mg²⁺ and S²⁻ forms Mg S
A1³⁺ and CI⁻ forms AlCl3Na⁺ and
N³⁻ forms Na3N
The formula unit is the smallest unit of an ionic substance that tells us of the ratio in which ions are combined in the ionic compound.
The formula unit for the compounds formed depends on the valency of the combining ions.
Usually, the formula unit is written on the valency of the ions.
The formula unit for the compound formed when each pairs of ions interact are therefore as written-
Li⁺ 0²⁻ forms Li2O
Mg²⁺S²⁻ forms Mg S
A1⁺³ CI⁻ forms AlCl3 and
Na+ N³⁻ forms Na3N.
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