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keemilise elemendi rühma number perioodilisustabelis; A-rühmade elementidel võrdub väliskihi elektronide arvuga elemendi aatomis
rühmanumber . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/r%C3%BChmanumber/1/est (03.07.2026)
