actinium

所屬欄目:英漢雙解化學

A soft silvery -white radioac-tive metallic element that is the first mem-ber of the actinoid series. It occurs in mi-nute quantities in uranium ores and themetal can be obtained by reducing the trif-luoride with lithium. It can be produced byneutron bomb ......(本文共 639 字 )     [閱讀本文] >>


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