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actinium
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actinium
Encyclopedia
理学
放射性元素
释
actinium
锕
天然放射性元素,元素符号Ac,原子序数89,半衰期最长的同位素的质量数227。属周期系ⅢB族,锕系元素。其英文名称源自古希腊语中的ακτίς、ακτίνος(aktis、aktinos),意为光线。
Astronomy
actinium
缩写:Ac。锕
Chemistry
>放射化学与辐射化学>放射性元素化学>释义
actinium
锕
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