A molecule of a binary salt contains two metal atoms and one sulphur atom. Determine the number of metal atoms present in one molecule of the binary salt formed by that metal and nitrogen? Give reasons in support of your answer.

Explanation

To determine the number of metal atoms present in one molecule of the binary salt formed by that metal and nitrogen, we can follow these steps:

### Step 1: Understand the Composition of the Binary Salt
The question states that the binary salt contains two metal atoms and one sulfur atom. We can represent the metal as "M" and sulfur as "S". Therefore, the formula for this binary salt can be written as:
\[ M_2S \]

### Step 2: Determine the Valency of Sulfur
Sulfur typically has a valency of -2. This means that in the compound \( M_2S \), the total positive charge from the metal atoms must balance the -2 charge from the sulfur atom to make the compound neutral.
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