How would we differentiate graphite, bromine, hydrogen fluoride, lithium fluoride, and hydrogen bromide?
Graphite is a network covalent solid, and lithium fluoride is an ionic solid. Neither substance is molecular, and these would be expected to exhibit exceptionally high melting and boiling points, which reflects the strength of the interparticle bond.
On the other hand,
Hydrogen fluoride features hydrogen bound to a highly electronegative fluorine, and results in an elevated boiling point of