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am·er·i·ci·um AHD[ăm'ə-rĭshʹē-əm] D.J.[ˌæməˈrɪʃiːəm]K.K.[ˌæməˈrɪʃiəm]n.Symbol Am （名词）符号 Am - A white metallic transuranic element of the actinide series, having isotopes with mass numbers from 237 to 246 and half-lives from 25 minutes to 7,950 years. Its longest-lived isotopes, Am 241 and Am 243, are alpha-ray emitters used as radiation sources in research. Atomic number 95; specific gravity 11.7; valence 3, 4, 5, 6. See table at element 镅：锕系元素中的一种白色超铀金属元素，其同位素原子序数是从237到246，半衰期从25分钟到7,950年。其寿命最长的同位素镅241和镅243在研究中用作α射线辐射源。原子序数为95；比重11.7；原子价为3,4,5,6 参见 element
- After America 源自 America
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