Question

Condition for the formation of a covalent bond :

• A. atoms should have two or more electron in their outermost shell
• B. atoms should have four or more electrons in their outermost shell
• C. atoms should have three or more electrons in their outermost shell.
• D. None of the above

Answer 1

The correct option is B atoms should have four or more electrons in their outermost shell

For the formation of covalent bond, each of the two combing atoms should have $5,6$ or $7$ electrons in their valence shells or the outermost shells.

In such cases, both the atoms achieve the stable octet by sharing $3,2$ or $1$ electron pair respectively.

The nonmetals of groups $VA,VIA$ and $VIIA$ respectively satisfy this condition and hence they are capable of covalent-bond formation.

Hence the correct option is B.