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Carbon is also found in coal, petroleum, and natural gas. Carbon is one of the most important elements on the periodic table (at least from the perspective of organic chemists!).
Adventures in Energy. Introduction. Oil and natural gas are naturally occurring chemicals that are made up of just two elements -- carbon and hydrogen. The class of chemicals based on carbon and hydrogen are called hydrocarbons. The simplest hydrocarbon, methane, is made up of one carbon atom and four hydrogen atoms.