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Ununtrium

Proposed Name

Atomic Number: 113
Atomic Symbol: Un

History

Here is a brief summary of the isolation of ununtrium. Currently, the identification of element 113 is yet to be confirmed by IUPAC, but the experiments leading to element 113 are now published in a prestigious peer reviewed journal. As only about four atoms of element 113 has ever been made (through decomposition of element 115 nuclei made in nuclear reactions involving fusing calcium nuclei with americium nuclei) isolation of an observable quantity has never been achieved, and may well never be. In the experiments leading to element 115 the following reactions occurred

24395Am + 4820Ca 287115Uup + 4 1n
24395Am + 4820Ca 288115Uup + 3 1n

In these first experiments, three nuclei of the 288Uup isotope were made and one of the 287Uup isotope. All the nuclei formed decayed in less than a second by emitting a-particles. These decays resulted in isotopes of ununtrium, element 113, (mass number 283 or 284, containing 113 protons and either 170 or 171 neutrons). These isotopes of element 113 are also radioactive and underwent further a-decay processes to isotopes of element 111 and so on down to at least element 105 (dubnium). One of the nuclei took over a second to decay to element 111.

287115Uup 283113Uut + 42He (46.6 milliseconds) 279111Uuu + 42He (147 milliseconds)

288115Uup 284113Uut + 42He (80.3 milliseconds) 280111Uuu + 42He (376 milliseconds)

288115Uup 284113Uut + 42He (18.6 milliseconds) 279111Uuu + 42He (1196 milliseconds)

288115Uup 284113Uut + 42He (280 milliseconds) 279111Uuu + 42He (517 milliseconds)




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