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Propene (C3H6).
Propene is commonly represented by the structural formula

and butene - C4H8 (see isomers) by the structural formula

where the double lines between
the carbon atoms
represent a double
covalent bond.
The single lines 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.