Abstract
At the time of writing (1986), the heaviest known element is that with atomic number 109. Isotopes of elements in this uppermost region have half-lives in the millisecond range and are produced, as the result of heavy-ion bombardments, with extremely small yield (one atom per week of bombardment for element 109). Nevertheless it should perhaps be possible to synthesize and identify isotopes of elements 110 and 111, and additional isotopes of elements 107–109. using methods similar to those already employed, but this will be difficult and very time-consuming.
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Seaborg, G.T., Lewin Keller, O. (1986). Future Elements. In: Katz, J.J., Seaborg, G.T., Morss, L.R. (eds) The Chemistry of the Actinide Elements. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3155-8_17
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DOI: https://doi.org/10.1007/978-94-009-3155-8_17
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