Project Details IUPAC/IUPAP Joint Working Group to Examine the 1991 Criteria used to Verify Claims for the Discovery of New Elements

Project No.:
Start Date:
01 June 2017
End Date:
Division Name:
Inorganic Chemistry Division
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Over twenty-five years have elapsed since the criteria* that are currently used to verify claims for the discovery of a new element were set down. Given the fact that technology and verification methods have changed and improved in the last two decades, it is justified to ask the question if the criteria are still valid. The recent completion of the naming of the one-hundred and eighteen elements in the first seven periods of the Periodic Table of the elements provides a natural opportunity for a necessary expert review of these criteria in the light of the experimental and theoretical advances in the field. It is proposed to set up a project for an IUPAC/IUPAP Joint Working Group (JWG) to examine and update these criteria.

*Wapstra et al “Criteria that must be satisfied for the discovery of a new chemical element to be recognized”, Pure Appl. Chem., Vol. 63, No. 6, pp. 879-886 (1991);


This JWG is set up for the specific task of reviewing and, if necessary, updating the criteria for validation of discoveries of new elements from 1991. This JWG is distinct from the IUPAC/IUPAP Joint Working Parties (JWP) which has and which – later – will evaluate actual claims of discovered new elements. Should the present JWG recommend any changes to these criteria, it will include in its report a recommendation on whether a JWP needs to be appointed to re-examine priorities assigned to any of the recently discovered elements based on these new criteria.


May 2018 – A draft of the technical report has been prepared and is under review.

Page last updated 16 May 2018