Question

define valency by taking example of silicon and oxygen​

Answer 1

Answer:

The valency of an element is the combining capacity of that element. The valency is determined by the number of valence electrons present in the atom of that element.

Example :-

For example, the atom of silicon has four valence electrons. Thus, the valency of silicon is four. Thus, the valency of oxygen is two.

Answer 2

Answer:

Definition: Valency is defined as the combining capacity of the element. It is determined by the number of valence shell electrons present in the atom.  

If the number of valence electrons is less than or equal to 4 so the valency is the same as the number of electrons present.  

If the number of valence electrons is more than 4 then the valency is 8-(the number of valence shell electrons).

Example:

(1)Silicon has atomic number 14. The electronic configuration of silicon is 2, 8, 4. The number of valence electrons is 4. So the valency is 4.

(2)Oxygen has an atomic number 8. The electronic configuration is 2, 6. The valency is (8-6)=2.