law·ren·ci·um /lɔˈrɛn(t)siəm/
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 law·ren·ci·um /lɔˈrɛn(t)sɪəm/ 名詞
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 lawrencium
      n : a radioactive transuranic element synthesized from
          californium [syn: Lw, atomic number 103]


 lawrencium
 Symbol: Lr
 Atomic number: 103
 Atomic weight: (262)
 Appearance unknown, however it is most likely silvery-white or grey
 and metallic. Lawrencium is a synthetic rare-earth metal. There are
 eight known radioisotopes, the most stable being Lr-262 with a half-life
 of 3.6 hours. Due to the short half-life of lawrencium, and its
 radioactivity, there are no known uses for it. Identified by Albert Ghiorso
 in 1961 at Berkeley. It was produced by bombarding californium with boron
 ions. The name is temporary IUPAC nomenclature, the origin of the name
 comes from Ernest O. Lawrence, the inventor of the cyclotron. If sufficient
 amounts of lawrencium were produced, it would pose a radiation hazard.