锝
锝是一种化学元素，渠个原子序数是43，化学符号是Tc。渠个所有同位素侪具有放射性，是原子序最小个非稳定元素。地球上现存个大部分锝侪是人工制造个，自然界中仅有极少量存在。拉铀矿中，锝是一种自发裂变产物；拉钼矿石中，钼经中子俘获后可以生成锝。锝是一种银灰色个金属晶体，渠个化学性质介于锰搭铼之间。
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