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tuuma moodustavate prootonite ja neutronite arvude summa, tähis: A
tuuma massiarv . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/tuuma%20massiarv/1/est (08.07.2026)
