isomer
noun
- molecule with same atoms but different arrangement
- nuclear state
Wiktionary
Pronunciation: /ˈaɪ.sə.mə/ / /ˈaɪ.sə.mɚ/
noun
Etymology: From iso- + -mer.
- Any of two or more compounds with the same molecular formula but with different structure.
- Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties.