In chemistry, the occurrence of a compound having the same empirical formula as another but a different molecular weight and structure.
From Greek 'allo-' (other) + '-merism' (from 'meros,' part); a 19th-century chemistry term for structural diversity with different atomic compositions.
Allomerism is like having ingredients that look the same on a label but make completely different dishes—acetylene (C₂H₂) and benzene (C₆H₆) are allomers of each other, and they're almost opposite in behavior!
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