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Question

Solve the below for FeandS.

  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

Iron is a bivalent cation and hence, the valency is 2. It means, by losing two electrons the charge becomes +2.

Sulphide is a bivalent anion and hence, the valency is 2. It means, by gaining two electrons the charge becomes -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 Fe2S2.

By using the simplest ratio, then the formula becomes FeS.

The chemical name of the compound is Iron (II) sulphide.


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