Answer:
A polar covalent bond is defined as the bond which is formed when there is a low difference of electronegativities between the two non metals. Example: Phosphorous and chlorine, Nitrogen and hydrogen
Non-polar covalent bond is defined as the bond which is formed when there is no difference of electronegativities between the atoms. Example: Oxygen and oxygen
Ionic bond is formed when there is complete transfer of electron from a highly electropositive metal to a highly electronegative non metal. The electronegative difference between the elements is high. Example: Potassium and chlorine
