钫
钫（Francium）是一种化学元素，化学符号为Fr，原子序为87，曾被叫作 eka-caesium。钫是一种放射性极高个金属。渠最稳定个同位素，钫-223（拉渠出现拉自然衰变链之前原本被叫作actinium K）个半衰期仅22分钟。钫个电负性仅高于铯。
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