a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
francium 片语
片语
francium oxide氧化钫
francium compounds钫化合物
Fr Francium钫
francium compound[无化]
eka francium类钫
Isotopes of franciumFrancium (Fr) has no stable isotope A standard atomic mass cannot be give
Francium Carbide钫碳化物
francium isotope[核]
francium 例句
英汉例句
Gallium is solid at room temperature but will melt if held in your hand, caesium (Cs), and francium (Fr) ?the second rarest naturally occurring element, can also be liquid at or near room temperature.