IUPAC votes to change standard atomic weights of 19 elements

The International Union of Pure and Applied Chemistry (IUPAC) voted to change the standard atomic weight for 19 elements to make the weight more exact. The IUPAC has controlled changes in the Periodic Table of Elements since 1919. When these changes are used in the Elements, it is said that the format and changes will be made in the Periodic Table of Elements. Exact weights help archaeologists get better examples for the element, and these changes will take place sometime next year.