Preview warning: unknown parameter "electron configuration"
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Preview warning: unknown parameter "image name 2"
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Preview warning: unknown parameter "oxidation states comment"
Unbitrium (pronounced /uːnˈbaɪtriəm/ ), also known as eka-protactinium or element 123, is the possible chemical element in the periodic table that has the temporary symbol Ubt and has the atomic number 123. Calculations have shown that 326 Ubt would be the most stable isotope. The closed neutron shells say that 307 Ubt and 319 Ubt would be the most stable isotopes.
As of February 2021, no attempt has ever been made to make element 123.
↑ Pyykkö, Pekka (2011). "A suggested periodic table up to Z ≤ 172, based on Dirac–Fock calculations on atoms and ions". Physical Chemistry Chemical Physics . 13 (1): 161–8. Bibcode :2011PCCP...13..161P . doi :10.1039/c0cp01575j . PMID 20967377 .