Chapter 8, Problem 79A

Interpretation Introduction

Interpretation:

Covalent bond formation is needs to be explained.

Concept introduction:

Nonionic compounds share electrons. The bond which results from the formation of electron sharing is termed as covalent bond. In this bonding, the shared pair of electrons are taken from the outermost energy level.

Answer to Problem 79A

To form covalent bonds, two atoms share a pair of electrons.

Explanation of Solution

In covalent bond formation, sharing of electrons take place. Due to this, shared electron pair both the atom to complete their octet. To see the covalent bond formation of molecule, consider ${\text{F}}_{\text{2}}$ molecules. Electron configuration of F is $1s^{2}2s^{2}2p^5$. Each F has 7 outermost electrons and needs one electron each to occur completely filled octet. Covalent bond in ${\text{F}}_{\text{2}}$ molecule is shown below.

Conclusion

Thus, to form covalent bonds, two atoms share a pair of electrons.