am·er·i·ci·um /ˌæməˈrɪʃiəm, si-/
 □


 am·er·i·ci·um /ˌæməˈrɪs(h)ɪəm/ 名詞
 鋂


 americium
      n : a radioactive transuranic metallic element; discovered by
          bombarding uranium with helium atoms [syn: Am, {atomic
          number 95]


 americium
 Symbol: Am
 Atomic number: 95
 Atomic weight: (243)
 Radioactive metallic transuranic element, belongs to the actinoids. Ten
 known isotopes. Am-243 is the most stable isotope, with a half-life of
 7.95*10^3 years. Discovered by Glenn T. Seaborg and associates in 1945, it
 was obtained by bombarding uranium-238 with alpha particles.