A chemical bond is formed to stabilize the outermost shell in an element. The outermost shell is destabilized mainly of two reasons –
a) Either the number of electrons are in excess of the minimum required electron
b) Or the number of electrons are lesser than the minimum required electron
When the electrons in an element are more than the required, a bond is formed with other element which has deficiency of electron and in case when electrons are less in numbers the vice versa happens. Such kind of chemical bonds are known as ionic bond. And in some case both the elements share the electrons among them to form the covalent bond.
