Isomer

usgb/ˈaɪsəmər/
noun

A compound with the same number and types of atoms as another compound, but arranged in a different way.

Butane and isobutane are isomers - they have the same number of carbon and hydrogen atoms but arranged differently.
Visual representation of "isomer" - A compound with the same number and types of atoms as another compound, but arranged in a different way.

Often appears as...

  • structural isomer
  • stereoisomer

Usage tips

Technical

Definition 1 of 1
Visual representation of "isomer"
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Visualize Molecules

Imagining the spatial arrangement of atoms can help grasp different isomer structures.

Illustration for Visualize Molecules
Picture the isomers of pentane like rearranged puzzle pieces with the same atoms.
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Beware Ambiguity

Isomers share chemical formulas but have unique properties, so specify the type when possible.

Illustration for Beware Ambiguity
When discussing isomers, clarify whether you mean a structural isomer or a stereoisomer.
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Chemistry-Specific

The term isomer is primarily used in chemistry and may confuse if used in other contexts.

Illustration for Chemistry-Specific
In chemistry class, we learned that glucose and fructose are isomers.
Visual representation of the word "Isomer"

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