Superheavy elements are now of considerable interest, particularly because signs of

Chapter 7, Problem 7.23

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Superheavy elements are now of considerable interest, particularly because signs of stability are starting to emerge with element 114, which has recently been made. Shortly before it was (falsely) believed that the first superheavy element had been discovered, an attempt was made to predict the chemical properties of ununpentium (Uup, element 115, O.L. Keller, C.W. Nestor, and B. Fricke, J. Phys. Chem. 78, 1945 (1974)). In one part of the paper the standard enthalpy and entropy of the reaction Uup+(aq) + 12 H2(g) Uup(s) + H+(aq) were estimated from the following data: subH7(Uup) = +1.5 eV, I(Uup) = 5.52 eV, hydH7(Uup+, aq) = 3.22 eV, S 7(Uup+, aq) = +1.34 meV K1, S 7(Uup, s) = 0.69 meV K1. Estimate the expected standard potential of the Uup+/Uup couple.