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    Untriennium (eka-actinium/dvi-lanthanum) is an unsynthesized chemical element with atomic number 139 and symbol Ute
    The name untriennium is a temporary IUPAC systematic element name



    In a relativistic approximation the speed of an electron in a 1s orbital] v, is estimated to approach the speed of light for 1s orbitals in element 138 At element 139 it is predicted that these electrons will have a speed in excess of c and as such would not have stable electron orbitals
    It is the first element with a filled type G electron shell holding 18 electrons and an electron and the overlaying type F orbital in its ground state

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    See also

    • Actinium
    • Eka-Radium — Eka-Actinium — Eka-Thorium

    • Bohrium
    • Eka-Seaborgium — Eka-Bohrium — Eka-Hassium