“francium”的概念、定义、翻译、参考文献-科学参考

单词	francium
释义	francium [`fran·sē·ǝm] ^CHEMISTRY A radioactive alkali-metal element, symbol Fr, atomic number 87, atomic weight distinguished by nuclear instability; exists in short- lived radioactive forms, the chief isotope being francium- 223.
随便看	baryte Barytheriidae Barytherioidea barytine barytocalcite barytropic gas basal basal arkose basal body basal-cell carcinoma basal-cell epithelioma basal cleavage basal complex basal conglomerate basal coplane basal disc basal ganglia basal groundwater basalia basalis basal lamina basal membrane basal metabolic rate basal metabolism basal orientation

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