CHEMISTRY|CLASS11|CHEMICAL BONDING 1

Chemical bond:

The force which holds atoms  together within  a molecule is called a chemical bond.

 WHY ATOMS COMBINE?

*The atoms of different element combine with each other in order to complete their octet.(eight electron in their outer most orbit ).It is LEWIS- KOSSEL approach in chemical bonding.

MODES OF CHEMICAL COMPOSITION:

THIS CAN BE DONE IN TWO WAYS 

1 . By complete transfer of one or more electron from one atom to another it is called  electrovalency  ,   and chemical bond formed termed as electrovalent or ionic bond.


2. By sharing of electron ,it can be done in two ways


*  when shared electron are contributed equally by both atoms,bond formed known as covalent bond.
 
*  when shared electron contributed by one atom of the bond, bond formed known as coordinate bond.