Question

An element $A$ combines with oxygen to form an oxide $AO$. The oxide is electrically conducting. Find the number of valence electrons in $A$.

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B 2

The element $A$ combines with oxygen to form an oxide called $AO$.

Valence electrons of oxygen $=2$

Valence electrons of $A$ will also be $=2$, to form oxide $AO$. Therefore, a number of valence in electrons in $A$, will be $2$. This oxide is electrically conducting.