French 1931 en science Cited by user Mandeville on 25 Apr 2023 * 18 mars : la compagnie Schick met sur le marché le premier rasoir électrique efficace.
English Hückel's rule Cited by user 106.210.233.35 on 14 Sep 2020 In organic chemistry, Hückel's rule estimates whether a planar ring molecule will have aromatic properties.
English Semi-empirical quantum chemistry method Cited by user Forbes72 on 12 Jan 2020 Semi-empirical quantum chemistry methods are based on the Hartree–Fock formalism, but make many approximations and obtain some parameters from empirical data.
German Molekülorbitaltheorie Cited by user Cepheiden on 29 Sep 2019 Die Molekülorbitaltheorie (kurz MO-Theorie) ist neben der Valenzbindungstheorie (VB-Theorie) eine von zwei komplementären Möglichkeiten, die Elektronenstruktur von Molekül…
Romanian Regula lui Hückel Cited by user Alex Nico on 18 Dec 2017 100px|thumb|right|[[Benzenul, una dintre cele mai întâlnite hidrocarburi aromatică, are conforma regulii lui Hückel 6 (4n + 2, unde n = 1) electroni delocalizați.]] În…
Chinese 休克尔规则 Cited by user Makecat on 19 Jun 2011 休克尔规则是有機化學的经验規則。它是指當闭合环状平面型的共轭多烯（輪烯）π电子数为4n+2时，具有芳香性。 例如，苯、18-轮烯具有芳香性，而环丁二烯和环辛四烯不具有芳香性。10-轮烯不具有芳香性，因为所有参与共轭的碳原子不都在同一平面上。 苯是最常见的芳香化合物，有6个（4n+2，n=1）π电子。 该规则的量子力学基础在1931年由物理化…
Japanese ヒュッケル則 Cited by user Akane700 on 13 Jan 2011 ヒュッケル則（ヒュッケルそく、）は、平面環状分子についてその芳香族性を推定する規則で、π電子の数が 4n + 2 （n は0を含めた正の整数）であれば芳香族性を有するというものである。この4n+2をヒュッケル数と言う。1931年にドイツ人物理化学者のエーリヒ・ヒュッケルによって量子力学を基に考案された。簡潔に 4n + 2 ルールと表現した…
Romanian Aromaticitate Cited by user Farmacist on 15 Nov 2009 300px|right|Benzene resonance Caracterul aromatic este un concept în chimia organică ce explică stabilitatea foarte mare a majorității structurilor ciclice.