单词 | actinium |
释义 | actinium[æk'tiniəm]n. 锕【化】 锕Ac【医】 锕(89号元素) actinium ac.tin.i.um AHD: [²k-t¹n“¶-…m] D.J. [#k6t!ni8*m]K.K. [#k6t!ni*m]n.Symbol Ac (名词)符号 Ac A radioactive element found in uranium ores, used in equilibrium with its decay products as a source of alpha rays. Its longest lived isotope is Ac 227 with a half-life of 21.7 years. Atomic number 89; melting point 1,050&9{=}C; boiling point (estimated) 3,200&9{=}C; specific gravity (calculated) 10.07; valence 3.See table at element 锕:一种在铀矿中发现的放射性元素,作为阿尔法射线能源增入点用于与其衰变产物的平衡过程中,其最长的活同位素是半衰期为21.7年的锕227。原子序数为89;熔点为1,050摄氏度;(估计的)沸点为3,200摄氏度;(计算出的)比重为10.07;原子价为3参见 element |
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