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unnilpentium |
2 definitions found From WordNet r 1.6 [wn]: unnilpentium n : a transuranic element that has not been found in nature [syn: {unnilquintium}, {Unp}, {hahnium}, {element 105}, {atomic number 105}] From Elements database 20001107 [elements]: unnilpentium Symbol: Unp Atomic number: 105 Atomic weight: (262) Radioactive transactinide element. Half-life of 1.6s. Discovered in 1970 by Berkeley researchers. So far seven isotopes have been discovered.
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