Description
The Commission on Isotopic Abundances and Atomic Weights (CIAAW) is an international scientific committee of IUPAC under its Inorganic Chemistry Division. Since 1899, CIAAW is entrusted with periodic critical evaluation of atomic weights of elements and other cognate data, such as the isotopic composition of elements. CIAAW has been a part of IUPAC since the first General Assembly of IUPAC in 1920. Visit the Commission’s website ciaaw.org for more information.
Subcommittees and Commissions
Activity Reports
Recent releases and publications (full list is available at https://www.ciaaw.org/publications.htm)
- 5 June 2018 – CIAAW recommended changes to the standard atomic weights of 14 chemical elements: Al, Ar, Co, Au, Ho, Ir, Mn, Nb, Pr, Pa, Rh, Tb, Tm, and Y
- 24 August 2015 – CIAAW recommended a change to the standard atomic weight of ytterbium.
– - ATOMIC WEIGHT
– Atomic Weights of the Elements 2013, Pure Appl. Chem., 2016, Vol. 88, No. 3, pp. 265-291, https://doi.org/10.1515/pac-2015-0305 - ISOTOPIC COMPOSITION
– Isotopic Compositions of the Elements 2013, Pure Appl. Chem., 2016, Vol. 88, No. 3, pp. 293-306, https://doi.org/10.1515/pac-2015-0503 - ELEMENT-BY-ELEMENT REVIEW
– Atomic Weights of the Elements. Review 2000, Pure Appl. Chem., 2003, Vol. 75, No. 6, pp. 683-800, https://doi.org/10.1351/pac200375060683 - NATURAL VARIATIONS OF ISOTOPIC COMPOSITION
– Isotope-abundance variations and atomic weights of selected elements: 2016, Pure Appl. Chem., 2016, Vol. 88, No.12, pp. 1203-1224, https://doi.org/10.1515/pac-2016-0302 - OTHER TECHNICAL REPORTS, historical reviews and educational publications
see https://www.ciaaw.org/publications.htm - LINKS to
– Periodic Table of the Elements (IUPAC.org/what-we-do)
– Isotopesmatter.com (IUPAC project 2014-024-1-200)
– IUPAC100 Periodic Table Challenge
– IYPT2019.org