Isomer

:This article is about chemical isomers. For another use, see nuclear isomer.

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In chemistry, isomers are molecules with the same chemical formula and often with the same kinds of bonds between atoms, but in which the atoms are arranged differently. Many isomers share similar if not identical properties in most chemical contexts.

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A simple example of isomerism is given by propanol: it has the formula C3H8O (or C3H7OH) and the isomers

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Propan-1-ol (n-propyl alcohol; left) Propan-2-ol (isopropyl alcohol; right)

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H H H H H H

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Chemistry: Chemistry (in Greek: χημεία) is the science of matter that deals with the composition, structure, and properties of substances and with the transformations that they undergo. In the study of matter, chemistry also investigates its interactions with energy and itself (se...

Molecule: A molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. The science of molecules is called molecular chemistry or molecular physics, depending on the particular aspect of focus. Molecular chemistry is concerned with the laws gover...

Chemical formula: :See also chemical symbol....