
Concept explainers
Interpretation : Three pairs of atoms with polar covalent bonds with difference in their electronegativity values are to be named.
Concept Introduction :
The tendency of an atom to attract shared electrons is called electronegativity. When two atoms with different electronegativity values form a covalent bond with each other, the resultant bond is called polar covalent bond.

Answer to Problem 7E
Three pairs of atoms with polar covalent bonds are:
- CO- It has an electronegativity difference of 0.89
- HF-It has an electronegativity difference of 1.88
- HCl- It has an electronegativity difference of 1.06
Explanation of Solution
When the difference in electronegativity between two atoms is more than 0 and less than 2.1, the bond is polar covalent.
- CO- From the electronegativity scale, electronegativity value of carbon is 2.55 and oxygen is 3.44. Difference in electronegativity value= 3.44-2.55=0.89
- H-F- From the electronegativity scale, electronegativity value of hydrogen is 2.10 and fluorine is 3.98. Difference in electronegativity value=3.98-2.10=1.88
- HCl- From the electronegativity scale, electronegativity value of hydrogen is 2.10 and chlorine is 3.16. Difference in electronegativity value=3.16-2.10=1.06
In a polar molecule one atom is more electronegative than other atom. In polar covalent molecule the difference in electronegativity value is more than 0 and less than 2.1.
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