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釙,化學元素也,符號為Po,原子序八十四。屬族十六、氧族,位列主族。反應有類硒、碲。三者之中,其惟金屬。類於左近,鉈、鉛、鉍等。易於衰變,同位素悉不穩,職是之故,幾稀於世。天然之釙,微出於鈾礦,蓋鈾二三八衰變之物也,亦復衰變,每歷百三十八日,半化為鉛。當世之釙,多以中子擊鉍而成,所產甚稀,以毫克計。以衰變故,富放射能,劇毒無比,可斷化學鍵,亦可生熱,遂用諸太空探測器、抗靜電儀、中子源、阿爾法粒子源等。以其量稀,其性俱察於秋毫之末而已。
聲音動静,具錄於維基共享︰釙 |
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