The element carbon has the highest melting point around 4200 degree Celsius this high melting point is found in the carbon allotrope called diamond it is and crystalline allotrope of carbon and it has a perfectly defined the internal crystal structure.and also diamond is one of the hardest substances with hardness in mohs scale as 10 ten .diamond is so hard that it cannot be scratched and diamond can be cut or scratched only by the other diamond or lasers. Diamond is one of the hardest substance known to humans. The diamond has a tetrahedral geometry. Carbon also has highest catenation propert,it is a non metal which is belonging to the group 14 of the modern periodic table. All the elements in this group carbon family have a property of catenationexample of elements which are found in this carbon family are carbon silicon germanium tin , lead (plumbum) and very radioactive element flerovium.