A new take on quicksilver: The elements of Group 12 are generally considered post-transition metals with filled d shells. However, calculations predict d8 HgF4 (see plot of the electron localization function) to be stable. IR spectroscopy in solid neon and argon matrixes gives first experimental evidence for HgF4. As HgIV, mercury would be a true transition metal that fully utilizes its 5d orbitals in bonding.
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Wang et al. (2007) studied this question.
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