Solve the below for $Al and S$ .
Identify the valency.
Crisscross the valency.
Write the formula and name of the compound

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Solution

Step 1: Identifying the valency
Aluminium is a trivalent cation and hence, the valency is $3$ .
Sulphide is a bivalent anion and hence, the valency is $- 2$ .
Step 2: Crisscrossing the valency
Step 3: Formula and name of the compound
By crisscrossing the valency with the symbol above, the formula is derived as ${Al}_{2} S_{3}$ .
The chemical name of the compound is Aluminium Sulphide.

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