Graphite is an allotrope of carbon, which is a non-metal. While most non-metals are poor conductors of electricity, graphite is an excellent conductor due to its unique atomic structure with free electrons. Sulphur, Oxygen, and Hydrogen are all non-metals, but they are insulators and do not conduct electricity. Therefore, graphite is the exceptional non-metal that conducts electricity. (2 marks = ~50 words)