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the group of radioactive elements of atomic number 89 to 103 of the periodic system; namely actinium, thorium, potactinum, uranium, plutonium, radioaktiivsed elemendid aatomnumbriga 89 kuni 103 perioodilises süsteemis; nimelt Ac, Th, Pa, U, Pu jt
aktiniidid . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/aktiniidid/1/est (24.07.2026)
