释义 |
tho·ri·um AHD[thôrʹē-əm, thōrʹ-] D.J.[ˈθɔːriːəm, ˈθəʊr-]K.K.[ˈθɔriəm, ˈθor-]n.Symbol Th (名词)符号 Th - A radioactive silvery-white metallic element that is recovered commercially from monazite. Its longest-lived isotope, the only one that occurs naturally, is Th 232 with a half-life of 1.41 × 1010 years. It is used in magnesium alloys, and isotope 232 is a source of nuclear energy. Atomic number 90; atomic weight 232.038; approximate melting point 1,750°C; approximate boiling point 4,500°C; approximate specific gravity 11.7; valence 4. See table at element 钍:一种商业上从独居石中提取的放射性银白色金属元素,其自然界中寿命最长的同位素是钍232,半衰期为141×1010年。用于镁合金,同位素232是核能的来源。原子序数90;原子量232.038;熔点约为1,750°C;沸点约为4,500°C;比重约为11.7;原子价为4 参见 element
- After Thor 源自 Thor
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