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n.Symbol Cm （名词）符号 Cm A silvery, metallic synthetic radioactive transuranic element. Its longest lived isotope is Cm 247 with a half-life of '.4 million years. Atomic number 9'; melting point (estimated) ,350=C; valence 3.See table at element 锔：一种合成的银色放射性超铀金属元素。其周期最长的同位素是Cm247，该同位素的半衰期为'.4百万年。原子序数9'；熔点（估计值）,350=C；三价参见 element
来源：After &B{Marie} Curie 源自 &B{玛丽} Curie &B{Pierre} Curie &B{皮尔} Curie
