German physicist and chemist who formulated the Hückel rule for aromaticity and developed the Hückel molecular orbital method — a foundational contribution to theoretical chemistry.
Hückel rule (4n+2 π electrons for aromaticity): a simple rule predicting whether a cyclic compound is aromatic — one of the most widely applied rules in organic chemistry. Hückel molecular orbital (HMO) method: a simplified quantum mechanical treatment of π-electron systems. Debye-Hückel theory (with Peter Debye): the first successful theory of strong electrolytes.
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