Exinct Superheavy Element in Meteorites: Attempted Characterization

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Science  03 Mar 1972:
Vol. 175, Issue 4025, pp. 981-983
DOI: 10.1126/science.175.4025.981


If the unexplained fission xenon component in meteorites is due to a volatile superheavy element, this element must have had a heat of vaporization of 54 ± 3 kilocalories per mole and a normal boiling point of 2500° ± 400°K. The prime candidates are elements 111 and 115, followed by 113, 114, 112, and 116. Elements 105 to 110 are not volatile enough and can therefore be excluded.