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radioaktiivne valge metall, omadustelt aktinoid, keemiline element järjenumbriga 90
hõbevalge, plastne aktiivne metall (ρ 11,72 g/cm3, st 1750 °C), ülijuht alla 1,4 K, a grey radioactive metallic element belonging to the actinoids; a.n. 90; r.a.m. 232.038; r.d. 11.5–11.9 (17°C); m.p. 1740–1760°C; b.p. 4780–4800°C
