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A Writer's Dictionary:

isomer Definition


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isomer
noun
    1. chem.
      One of two or more chemical compounds that have the same chemical formula, ie the same molecular composition, but different three-dimensional structures.
    2. physics.
      One of two or more atomic nuclei with the same atomic number and mass number, but with different energy states and radioactive properties, eg different half-lives.
Derivative: isomeric
adj
    Etymology: 19c: from Greek isomeres having equal parts.



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