By virtue of its work in relation with the chemical elements, IUPAC can dispense a periodic table that is up-to-date. IUPAC involvement covers various aspects of the table and data that it unveils, and several reports and recommendations, some quite recent, attest of that input.
In particular, IUPAC is directly involved in the following:
- establishing the criteria for a new element discovery
- defining the structure of a temporary name and symbol
- assessing claims resulting in the validation and assignation of an element discovery
- coordinating the naming of a new element, involving the research laboratory and allowing for public comments
- setting up precise rules for how to name a new element
- defining Group 1-18 and collective names
- determining which elements belong to Group 3
- regularly reviewing standard atomic weights
The latest release of the Periodic Table (dated 4 May 2022) includes the most recent abridged standard atomic weight values released by the IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW), compiled as part of the 2021 Table of Standard Atomic Weights 2021. For elements that lack isotopes with a characteristic isotopic abundance in natural terrestrial samples, the mass number of the nuclide with the longest confirmed half-life is listed between square brackets.
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