The reliability of the (standard) atomic‐weight (mean atomic mass) values is quantified based on the analysis of changes made from published improved measurements as they become available for each periodic evaluation. This numerical analysis tests the evaluation procedures and the current reliability of the tables published by the International Union of Pure and Applied Chemistry. One instance of faulty evaluation is highlighted. The postfactotestofpastperformanceofevaluationsmightunderappropriateconditionsalsoserveforotherdatasetssuchasthefundamentalconstantsofphysicsorpropertydataforpureelements. §

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