Question

Select correct statements.

• A. The delocalised electrons in the $\pi$orbitals of graphite cause this allotropic form to conduct electricity.
• B. Pauling assigns "metallic valences" equal to their group number to the elements of IA to VIA.
• C. Diatomic lithium molecules $L{i}_2$ are stable towards dissociation.
• D. All of the above are correct statements.

Answer 1

The correct option is D All of the above are correct statements.

All are correct. Carbon conducts electricity due to the presence of free electron in the pi orbital. The electrons present in the outermost shell of an atom are called valence electrons and the number of these electrons determine the valency of the element.

For $L{i}_2$, electronic configuration is $1s^2\ast 1s^{2}2s^2$

Bond Order = $\frac{2-0}{2}$ = 1. It is a stable compound.