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2 definitions found
 for americium
From WordNet (r) 3.0 (2006) :

  americium
      n 1: a radioactive transuranic metallic element; discovered by
           bombarding uranium with helium atoms [syn: americium,
           Am, atomic number 95]

From The Elements (07Nov00) :

  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.
  

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