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Question

Solve the below for AlandS.

  1. Identify the valency.
  2. Crisscross the valency.
  3. 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 Al2S3.

The chemical name of the compound is Aluminium Sulphide.


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