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Carbon and hydrogen are two of the most abundant elements in the universe, and they form the basis of all organic molecules. Carbon has four valence electrons, which means that it can form four covalent bonds with other atoms. Hydrogen has one valence electron, which means that it can form one covalent bond with another atom. When carbon and hydrogen atoms bond together, they can form a variety of different compounds, including alkanes, alkenes, and alkynes. Alkanes are saturated hydrocarbons, which means that all of the carbon atoms are bonded to four other atoms. Alkenes are unsaturated hydrocarbons, which means that at least one carbon atom is bonded to two other carbon atoms. Alkynes are also unsaturated hydrocarbons, but they have at least one carbon-carbon triple bond.