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unnilseptium |
2 definitions found From WordNet r 1.6 [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.
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