Question

The valency shell of element A contains 3 electrons while the valency shell of element B contains 6 electrons. If A combines with B, the probable formula of the compound formed will be:

• A. AB\(_2\)
• B. A\(_2\)B
• C. A\(_2\)B\(_3\)
• D. A\(_3\)B\(_2\)

Hint:

Use valency crossover method to predict empirical formulas.

Answer 1

The Correct Option is A

Step 1: Element A has valency 3, element B has valency 2.
Step 2: Cross-multiplying valencies gives formula AB\(_2\).