Why do metals mostly form ionic compounds where as nonmetals form covalent compounds...does it have any link with the electronic configuration... if possible plz give an e.g using its electron configuration...?

Metals being more electropositive than non metals they form ionic bond.Non-metals are more electronegative than metals.So when two electronegative atom join they form covalent bond.
Remember these thing
(1)electronegative atom +electronegative-----covalent bond
(2)electronegative +electropositive gives ionin bond
(3)two electropositive atom will form metallic bond
The basic reason non-metals are more electronegative than metal