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hrm... another one for expansion later on. For now I've added an example
Two different [[molecule|molecules]] that have the same chemical formula.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
Two [[molecule]]s are '''isomers''' of each other if they have the same [[chemical formula]] but a different [[atom]]ic configuration.
For example, [[propanol]] (CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>OH) has two isomers: ''n-propanol'' and ''iso-propanol''. '''n-propanol''' is a straight chain (CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>OH), with its three carbons and its [[hydroxyl]] group in a line. ''Iso-propanol'', on the other hand, is branched, with two of the [[carbon]]s and the hydroxyl group all bonded to one carbon ((CH<sub>3</sub>)<sub>2</sub>CHOH). Both of these configurations have 3 carbons, 8 [[hydrogen]]s, and 1 oxygen, but since they are isomers they behave differently in chemical reactions.
<references/>
[[Category:Chemistry]]
[[Category:Chemistry]]