Why do graphite and diamond have different physical properties?
The answer is C. Graphite and Diamond are examples allotropes, the same element in the same physical state (gas, liquid, or solid), but in different structures, thus lending to their different properties. The carbon atoms in graphite are covalently bonded to three other carbon atoms, forming sheets that are able to slide over and past each other. The carbon atoms in diamond are covalently bonded with four other carbon atoms, thus making the hardest natural substance known to man. Hope this helps!