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Ptable. com Periodic Table For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses
Contact - Ptable Atomic weight is the official term used by IUPAC to refer to the relative atomic masses published specifically for inclusion in periodic tables The term is used because they are weighted averages Isn't it supposed to be Lanthan ide , not - oid ? No, not according to IUPAC [PDF] (IR-3 5) The electron configuration for an element is wrong
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Ptable. com Wide Periodic Table For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses
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