Question

An element $X$ combines with oxygen to form an oxide $X_{2}O$. This oxide is electrically conducting. How many electrons would be there in the outermost shell of the element $X$?

• A. 1
• B. 2
• C. 3
• D. 0

Answer 1

The correct option is A 1

Whenever the formula is written, the valencies of cations and anions are exchanged. Therefore the valency of $X$ is 1. Therefore, the outermost shell contains 1 electron.