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The physical properties of carbon vary widely with the allotropic form.

All carbon allotropes are solids under normal conditions, with graphite being the most thermodynamically stable form at standard temperature and pressure.

Graphite is soft enough to form a streak on paper (hence its name, from the Greek verb "γράφειν" which means "to write"), while diamond is the hardest naturally occurring material known.

Graphite is a good electrical conductor while diamond has a low electrical conductivity.

It does not react with sulfuric acid, hydrochloric acid, chlorine or any alkalis.

At elevated temperatures, carbon reacts with oxygen to form carbon oxides and will rob oxygen from metal oxides to leave the elemental metal.

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