CBSE Class 10 Answered

Covalent bonds are formed by sharing of electrons between two atoms.

Polar covalent bonds are formed between atoms with difference in electronegativities. The more electronegative atom attracts the shared pair of electrons towards itself and hence acquires a partial negative charge whereas the atom with lesser electronegativity acquires a partial positive charge. Eg - H-Cl , H-Br, etc

Non - polar covalent bonds are formed between atoms with same electronegativities. Hence the shared pair of electrons is shared equally by both the atoms. Eg - H-H , Cl-Cl, O=O etc