In solid argon,the atoms are held together by

Total number of molecules which have cation-anion pair out of $I_{2(s)}$,dry ice $(CO_{2(s)})$,$PCl_{5(s)}$,$N_2O_{5(s)}$,$PBr_{5(g)}$ is

Which has the weakest bond?

Give reasons: Graphite is used as a lubricant.

In a diamond,how many other $C$ atoms is each $C$ atom bonded to?

The dipole-dipole interaction energy between stationary polar molecules and rotating polar molecules,respectively,is proportional to: [$r$ is the distance between the polar molecules]