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Propane (C₃H₈).

Propane is commonly represented by the structural formula

and butane (C₄H₁₀ see isomers)
is commonly represented by the structural formula

where the single lines between the atoms represent single covalent bonds.

Note that each carbon atom has four bonds (valency 4),
and each hydrogen atom has one bond (valency 1).
Valency is the combining power of an atom.

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Copyright © 2008 Dr. Colin France. All Rights Reserved.