Unnilseptium

2 definitions found

From WordNet (r) 2.0 [wn]:

  unnilseptium
       n : a transuranic element that has not been found in nature
           [syn: {Uns}, {element 107}, {atomic number 107}]

From Elements database 20001107 [elements]:



  unnilseptium
  Symbol:
  Atomic number: 107
  Atomic weight: (262)
  Radioactive transition metal. Half-life of approximately 1/500 s.
  Discovered by the Joint Institute for Nuclear Research at Dubna (U.S.S.R.)
  in 1976. Confirmed by West German physicists at the Heavy Ion Research
  Laboratory at Darmstadt.