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perioodilisustabeli rühm, mis sisaldab nii lühikeste kui ka pikkade perioodide elemente
подгруппa А . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/%D0%BF%D0%BE%D0%B4%D0%B3%D1%80%D1%83%D0%BF%D0%BFa%20%D0%90/1/rus (18.08.2026)