Define valency by taking examples of silicon and oxygen.

Q.7:- Define valency by taking examples of silicon and oxygen.

 

Answer:-

The number of electrons gained, lost or shared so as to complete the octet of electrons in valence shell is called valency.

Valency of silicon: It has electronic configuration → 2,8.4
Thus, 4 electrons are shared with other atoms to complete the octet and so its valency = 4
Valency of oxygen : It has electronic configuration →2,6
Thus, It will gain 2 electrons to complete its octet. So its valency = 2