Question

The valency of an element is its combining capacity.

• A. True
• B. False

Answer 1

The correct option is A True

• Valency is the combining capacity of an atom or an ion.
• The number of electrons gained, losed or shared to take part in a bond formation is called as valency.
• The oxygen has the atomic number $8$, so the electronic configuration is $2,6$.
• If the number of valence electron is greater than $4$, then valency is $8-6=2$.
• For the element boron whose atomic number $5$ has the electronic configuration $2,3$.
• If the number of valence electron is less than or equal to $4$, then valency is equal to valence electrons. so the valency is $3$.

Therefore, the given statement is true. i.e., the valency of an element is its combining capacity.