Why the melting point of carbon is higher than the melting point of neon?
Carbon readily forms covalent bonds with its neighboring C atoms
due to its incomplete valence shell of electrons. Neon, being a
noble gas, has a completely filled valence shell and therefore does
not form bonds easily with its neighboring atoms. As a result,
there are no covalent bonds to break in solid Neon and Ne will melt
at the very, very low temperature of 24.5 Kelvins compared to
graphite which melts at 3825 Kelvins.