Standard Atomic Weights Revised
Standard Atomic Weights Revised
Following its meeting, held 10-11 August 2005 at the 43rd IUPAC General Assembly, the Commission on Isotopic Abundances and Atomic Weights (II.1) released the changes to the standard atomic weights of 16 chemical elements. The following changes are based on new determinations of isotopic abundances and reviews of previous isotopic abundances and atomic masses:
| From | To | |
| Aluminium | 26.981 538 (2) | 26.981 5386 (8) |
| Bismuth | 208.980 38 (2) | 208.980 40 (1) |
| Caesium | 132.905 45 (2) | 132.905 4519 (2) |
| Cobalt | 58.933 200 (9) | 58.933 195 (5) |
| Gold | 196.966 55 (2) | 196.966 569 (4) |
| Lanthanum | 138.9055 (2) | 138.905 47 (7) |
| Manganese | 54.938 049 (9) | 54.938 045 (5) |
| Neodymium | 144.24 (3) | 144.242 (3) |
| Phosphorus | 30.973 761 (2) | 30.973 762 (2) |
| Platinum | 195.078 (2) | 195.084 (9) |
| Samarium | 150.36 (3) | 150.36 (2) |
| Scandium | 44.955 910 (8) | 44.955 912 (6) |
| Sodium | 22.989 770 (2) | 22.989 769 28 (2) |
| Tantalum | 180.9479 (1) | 180.947 88 (2) |
| Terbium | 158.925 34 (2) | 158.925 35 (2) |
| Thorium | 232.0381 (1) | 232.038 06 (2) |
These changes in the atomic weights will be published in a new Table of Standard Atomic Weights 2005, which will be submitted for publication in Pure and Applied Chemistry* by the end of 2005. The commission also continued its review of publications of variations in the natural isotopic abundances. The commission also continued its review of publications of the variation in the natural isotopic abundances. For more details about the Commission meeting in Beijing, see Division Roundups (in print on page 7).
For more information, contact Michael E. Wieser <mwieser@ucalgary.ca>, secretary of the IUPAC Commission on Isotopic Abundances and Atomic Weights.
* IUPAC Technical Report as Pure Appl. Chem. 78(11), 2051-2066, 2006
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- Contents
- Reflections at the End of a Presidency
- A Wrap-Up of the General Assembly
- Division Roundups
- Thanks to its Enduring Corrosion Resistance, an Indian Historical Artifact’s Appearance Belies its Age
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- Standard Atomic Weights Revised
- New CAs Join IUPAC
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- Fullerene Nomenclature–An Addendum to IUPAC History
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- Nanotechnology: Science and Application
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- Electrical and Related Properties of Organic Solids and Polymers
- Physical Chemistry: Education and Challenges
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- Mark Your Calendar
- Index for 2005
Articles in the same Issue
- Masthead
- From the Editor
- Contents
- Reflections at the End of a Presidency
- A Wrap-Up of the General Assembly
- Division Roundups
- Thanks to its Enduring Corrosion Resistance, an Indian Historical Artifact’s Appearance Belies its Age
- Where is there Wisdom to be Found in Ancient Materials Chemistry?
- IUPAC–Samsung Education Prize for 2005
- IUPAC-Richter Prize in Medicinal Chemistry
- Standard Atomic Weights Revised
- New CAs Join IUPAC
- IUPAC Poster Prizes Awarded in Denmark
- Fullerene Nomenclature–An Addendum to IUPAC History
- Emerging Issues in Developing Countries
- JCAMP-DX for Electron Magnetic Resonance
- XML-Based IUPAC Standard for Experimental, Predicted, and Critically Evaluated Thermodynamic Property Data Storage and Capture (ThermoML)
- Critical Evaluation of Stability Constants of Metal Complexes of Complexones for Biomedical and Environmental Applications (IUPAC Technical Report)
- Round Robin Test on the Molecular Characterization of Epoxy Resins by Liquid Chromatography
- Organic Synthesis–PAC Special Topic Issue
- Nomenclature of Inorganic Chemistry – IUPAC Recommendations 2005
- Analogue-Based Drug Discovery
- Measurement of the Thermodynamic Properties of Multiple Phases
- Polymer Chemistry, Reactions and Processes
- The Periodic Table: Into the 21st Century
- Nanotechnology: Science and Application
- Heterocyclic Conference
- Electrical and Related Properties of Organic Solids and Polymers
- Physical Chemistry: Education and Challenges
- Neurotoxic Metals: Lead, Manganese, and Mercury– From Research to Prevention
- Polymers and Organic Chemistry
- Biodiversity and Natural Products
- Green Chemistry
- Aromatic Compounds
- Organometallic Chemistry
- Biotechnology: Milestones towards Sustainability of Human Society
- Mark Your Calendar
- Index for 2005
