Template:Standard atomic weight of the elements

v t e Standard atomic weight of the elements (IUPAC 2009–2021^{[ref 1]})
Z	Symbol	Name	A_{r, standard}	abridged	year changed
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(This list: view • edit )

CIAAW may publish changes to atomic weights (including its precision and derived values). Since 1947, any update this is done in odd years nominally; the actual date of publication may be some time later.

2009 {{CIAAW2009}} (introducing interval notation; Ge):

Template:CIAAW2009

2011 {{CIAAW2011}} (interval for Br, Mg):

Template:CIAAW2011

2013 {{CIAAW2013}} (all elements listed):

Template:CIAAW2013/cite journal

2015 {{CIAAW2015}} (ytterbium changed):

Template:CIAAW2015

2017 {{CIAAW2017}} (14 values changed):

Template:CIAAW2017

2019 (hafnium value changed): Meija, Juris. Standard atomic weight of hafnium revised (2019-12-09)CIAAW. Retrieved 2020-02-25.
2020* (lead value changed): Zhu, Xiang-Kun. Variation of lead isotopic composition and atomic weight in terrestrial materials (IUPAC Technical Report) (1 October 2020). doi:10.1515/pac-2018-0916.

* "2020" is an inconsistent year for change publication: CIAAW maintains that only odd years, changes are publicised.

2021 {{CIAAW2021}} (all elements listed); (4 values changed; introduced new symbol; merge "conventional" into "abridged" columns; change uncertainty notation (use "±")

Template:CIAAW2021
Uncertainty handling

About notation and handling of the uncertainty in the values, including those in [ ] range values:

Possolo, Antonio. Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report) (4 Jan 2018). doi:10.1515/pac-2016-0402. Retrieved 20 Oct 2020.
{{CIAAW2021}}: changing notation (i.e., interpretation, not the value) from 123.45(2) into 123.45±0.02

Outdated references

{{NUBASE 1997}} — Audi
{{NUBASE 2003}} — Audi (used in the 2008 enwiki "Isotopes of <element>" Big Tables)
{{NUBASE 2012}}
{{CIAAW2003}} — De Laeter
{{CIAAW 2005}} — Wieser

{{CRC85}} ({{CRC85|chapter=11}}) &mdsh; Holden
Universal Nuclide Chartnucleonica. -- broken/bad access

See also: {{Isotopes table/references}}

References

This reference list does not appear in the article.

Template documentation[view] [edit] [history] [purge]

Usage

Standard atomic weight, infobox element, isotopes of element.

Data source

All values are as published by CIAAW.

The atomic weight (A_r) specifiers "standard atomic weight", "abridged atomic weight", "conventional atomic weight" are thus named and defined (numerical value as listed here) by IUPAC (CIAAW).^[1]^[2]

Data templates:
{{Infobox element/symbol-to-saw}} (parent template, no data)

|format=standard [default], abridged, formal-short-rounded

{{Infobox element/symbol-to-saw/standard}}, Template:CIAAW2021

Number formatting

Per source, abridged numbers without stated uncertainty have uncertainty (1). So A_{r, abridged}(Be) = 9.0122, reads 9.0122(1).
All numbers are formatted through {{val}}. This introduces the small space as 1000-grouping (per MOS:DIGITS).

CIAAW value updates