| 单词 | thorium |
| 释义 | thorium['θəuriəm]n. 钍【化】 钍Th【医】 钍(90号元素) thorium tho.ri.um AHD: [thôr“¶-…m, th½r“-] D.J. [6G%8ri8*m, 6G*&r-]K.K. [6G%ri*m, 6Gor-]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&9{=}C; approximate boiling point 4,500&9{=}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&9{=}C；沸点约为4,500&9{=}C；比重约为11.7；原子价为4 参见 element语源:After Thor 源自 Thor |
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