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天然放射性元素。元素符号Th,原子序数90,原子量232.0381,锕系放射性元素。
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放射性元素
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天然放射性元素,元素符号Th,原子序数90,原子量232.0377。属周期系ⅢB族,锕系元素。以北欧神话中的雷神托尔(Thor)命名。
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