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francium
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francium
Encyclopedia
理学
放射性元素
释
francium
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天然放射性元素,元素符号Fr,原子序数87,半衰期最长的同位素的质量数223,属周期系ⅠA族,碱金属元素。为纪念发现者M.佩雷[注]的祖国法国(France)而命名。
Astronomy
francium
缩写:Fr。钫
Chemistry
>放射化学与辐射化学>放射性元素化学>释义
francium
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non eXecution(NX) bit technology
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nonferroelectric photore-fractive materials
non-ferromagnetic expansion alloy
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