#### Question

A metal X is in the first group of the periodic table. What will be the formula of its oxide?

#### Solution

The elements in the first group of the periodic table have a valency of 1. As the metal X is in the first group, its valency is 1. We know that the valency of oxygen is 2 because it needs two electrons to complete its outer shell of 8. From this, we can conclude that two atoms of metal X will combine with one atom of oxygen to form an oxide X_{2}O. Therefore, the formula of the oxide of metal X is X_{2}O.

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Solution A Metal X is in the First Group of the Periodic Table. What Will Be the Formula of Its Oxide? Concept: Periodic Classification of Elements Questions.