钷
钷是一种化学元素，符号为Pm，原子序61，属于镧系元素搭稀土元素，渠所有个同位素侪带有放射性。钷拉自然界极其罕见，拉任意给定个辰光内，地球地壳中自然产生个钷只有500-600克。拉原子序82铅以前只有两个元素没稳定个同位素，其中一个即为钷，另一个是锝。拉化学上，钷是一种镧系元素，会搭其他元素形成盐类。
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