Which pair of atoms forms a nonpolar covalent bond? which pair of atoms forms a nonpolar covalent bond? na and cl c and o n and cl b and o?

Types of Bonds can be predicted by calculating the difference in electronegativity.

If, Electronegativity difference is,

                Less than 0.4 then it is Non Polar Covalent

                Between 0.4 and 1.7 then it is Polar Covalent 

                Greater than 1.7 then it is Ionic

For Na and Cl,

                    E.N of Chlorine       =   3.16

                    E.N of Sodium        =   0.93

                    E.N Difference             2.23          (Ionic Bond)

For C and O,

                    E.N of Oxygen       =   3.44

                    E.N of Carbon        =   2.55

                    E.N Difference             0.89          (Polar Covalent Bond)

For N and Cl,

                    E.N of Chlorine      =   3.16

                    E.N of Notrogen     =   3.04

                    E.N Difference             0.12           (Non-Polar Covalent Bond)

For B and O,

                    E.N of Oxygen        =   3.44

                    E.N of Boron           =   2.04

                    E.N Difference             1.40          (Polar Covalent Bond)

what are the two models

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