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...is due to the presence of a filled 4f shell. An f shell poorly screens the nuclear charge that increases the attractive [[Coulomb's law|Coulomb interaction]] ...an a day. {{chem|199|Hg}} and {{chem|201|Hg}} are the most often studied [[Nuclear magnetic resonance|NMR]]-active nuclei, having spins of {{frac|2}} and {{fr

...e. Its four stable isotopes have 82 [[proton]]s, a "magic number" in the [[nuclear shell model]] of [[atomic nuclei]]. ...es|title = The NUBASE Evaluation of Nuclear and Decay Properties|journal = Nuclear Physics A|volume = 729| pages = 3–128| publisher = Atomic Mass Data Cente