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  • In chemistry, isomers (from Greek ισομερης, isomerès; isos = "equal", méros = "part") are compounds with the same molecular formula but different structural formulas.[1] Isomers do not necessarily share similar properties, unless they also have the same functional groups. — “Isomer - Wikipedia, the free encyclopedia”,
  • In general, such isomers contain double bonds, which cannot rotate, but they can also arise from ring structures, wherein the rotation of bonds is greatly restricted. Cis and trans isomers occur both in organic molecules and in inorganic coordination complexes. — “Cis–trans isomerism - Wikipedia, the free encyclopedia”,
  • A nuclear isomer is a metastable state of an atomic nucleus caused by the excitation of one or more of its nucleons (protons or neutrons) As a result, the term "metastable" is usually restricted to refer to isomers with half-lives of 10−9 seconds or longer. — “Nuclear isomer - Wikipedia, the free encyclopedia”,


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