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Exinct Superheavy Element in Meteorites: Attempted Characterization

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.