🌐EnglishEnglishDeutschFrançaisItalianoPolskiPortuguêsРусскийالعربيةहिन्दी한국어中文日本語EntityQ570412· pop 16· linked from 115 articlesselection ruleAlso known as transition ruleformal constraint on the possible transitions of a system from one quantum state to anotherAvailable in 16 languagesFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةहिन्दीBelarusianCatalanConnectionshydrogen chlorideEntityeven and odd functionsEntityCategoriesNuclear magnetic resonanceQuantum mechanicsSpectroscopy