砹
砹（Astatine）是一种具有极高放射性个化学元素，符号为At，原子序为85。地球上所有个砹侪是更重个元素衰变过程中产生个。渠个同位素寿命侪咾短，其中最稳定个是砹-210，半衰期为8.5小时。
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