Determine whether the bond between each of the following pairs of atoms is purely covalent, polar covalent, or ionic. 1. O and O 2. Li and O 3. C and N 4. N and S Solution Pure covalent bond- when both the participating atoms are having same electronegativity value (i.e- for homonuclear molecules) Exp - O and O polar covalent bond- both particiapting atoms share equal number of electrons to form coavalent bond, however, the shared electron pair remains more towards the more electronegative atoms. Exp- C and N (electronegativity of N is more than C, the share electron pair remains towards the nitrogen. carbon bears partial positive charge and nitrogen bears partial negative charge) N and S (electronegativity of N is more than S, the share electron pair remains towards the nitrogen. sulfur bears partial positive charge and nitrogen bears partial negative charge) Ionic bond - one atom is highly electronegative and the other atom is highly electropositive EXp- Li and O .

1. Determine whether the bond between each of the following pairs of atoms is purely covalent,
polar covalent, or ionic.
1. O and O
2. Li and O
3. C and N
4. N and S
Solution
Pure covalent bond- when both the participating atoms are having same electronegativity value
(i.e- for homonuclear molecules) Exp - O and O
polar covalent bond- both particiapting atoms share equal number of electrons to form
coavalent bond, however, the shared electron pair remains more towards the more
electronegative atoms.
Exp- C and N (electronegativity of N is more than C, the share electron pair remains towards the
nitrogen. carbon bears partial positive charge and nitrogen bears partial negative charge)
N and S (electronegativity of N is more than S, the share electron pair remains towards the
nitrogen. sulfur bears partial positive charge and nitrogen bears partial negative charge)
Ionic bond - one atom is highly electronegative and the other atom is highly electropositive
EXp- Li and O