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理学
放射性元素
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protactinium
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天然放射性元素,元素符号Pa,原子序数91,原子量为231.03588,属周期系ⅢB族,锕系元素。
Astronomy
全称:protactinium。缩写:Pa
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Chemistry
>放射化学与辐射化学>放射性元素化学>释义
protactinium
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