Cèṭa'an:Standard atomic weight of the elements

Standard atomic weight of the elements (IUPAC 2009–2021^{[ref 1]})
Z	Symbol	Name	A_{r, standard}	Abridged	Year changed
1	H	H: Hydrogen	[1.00784, 1.00811]	1.0080±0.0002	2009
2	He	He: Helium	4.002602±0.000002	4.0026±0.0001	1983
3	Li	Li: Lithium	[6.938, 6.997]	6.94±0.06	2009
4	Be	Be: Beryllium	9.0121831±0.0000005	9.0122±0.0001	2013
5	B	B: Boron	[10.806, 10.821]	10.81±0.02	2009
6	C	C: Carbon	[12.0096, 12.0116]	12.011±0.002	2009
7	N	N: Nitrogen	[14.00643, 14.00728]	14.007±0.001	2009
8	O	O: Oxygen	[15.99903, 15.99977]	15.999±0.001	2009
9	F	F: Fluorine	18.998403162±0.000000005	18.998±0.001	2021
10	Ne	Ne: Neon	20.1797±0.0006	20.180±0.001	1985
11	Na	Na: Sodium	22.98976928±0.00000002	22.990±0.001	2005
12	Mg	Mg: Magnesium	[24.304, 24.307]	24.305±0.002	2011
13	Al	Al: Aluminium	26.9815384±0.0000003	26.982±0.001	2017
14	Si	Si: Silicon	[28.084, 28.086]	28.085±0.001	2009
15	P	P: Phosphorus	30.973761998±0.000000005	30.974±0.001	2013
16	S	S: Sulfur	[32.059, 32.076]	32.06±0.02	2009
17	Cl	Cl: Chlorine	[35.446, 35.457]	35.45±0.01	2009
18	Ar	Ar: Argon	[39.792, 39.963]	39.95±0.16	2017
19	K	K: Potassium	39.0983±0.0001	39.098±0.001	1979
20	Ca	Ca: Calcium	40.078±0.004	40.078±0.004	1983
21	Sc	Sc: Scandium	44.955907±0.000004	44.956±0.001	2021
22	Ti	Ti: Titanium	47.867±0.001	47.867±0.001	1993
23	V	V: Vanadium	50.9415±0.0001	50.942±0.001	1977
24	Cr	Cr: Chromium	51.9961±0.0006	51.996±0.001	1983
25	Mn	Mn: Manganese	54.938043±0.000002	54.938±0.001	2017
26	Fe	Fe: Iron	55.845±0.002	55.845±0.002	1993
27	Co	Co: Cobalt	58.933194±0.000003	58.933±0.001	2017
28	Ni	Ni: Nickel	58.6934±0.0004	58.693±0.001	2007
29	Cu	Cu: Copper	63.546±0.003	63.546±0.003	1969
30	Zn	Zn: Zinc	65.38±0.02	65.38±0.02	2007
31	Ga	Ga: Gallium	69.723±0.001	69.723±0.001	1987
32	Ge	Ge: Germanium	72.630±0.008	72.630±0.008	2009
33	As	As: Arsenic	74.921595±0.000006	74.922±0.001	2013
34	Se	Se: Selenium	78.971±0.008	78.971±0.008	2013
35	Br	Br: Bromine	[79.901, 79.907]	79.904±0.003	2011
36	Kr	Kr: Krypton	83.798±0.002	83.798±0.002	2001
37	Rb	Rb: Rubidium	85.4678±0.0003	85.468±0.001	1969
38	Sr	Sr: Strontium	87.62±0.01	87.62±0.01	1969
39	Y	Y: Yttrium	88.905838±0.000002	88.906±0.001	2021
40	Zr	Zr: Zirconium	91.222±0.003	91.222±0.003	2024
41	Nb	Nb: Niobium	92.90637±0.00001	92.906±0.001	2017
42	Mo	Mo: Molybdenum	95.95±0.01	95.95±0.01	2013
43	Tc	Tc: Technetium	-
44	Ru	Ru: Ruthenium	101.07±0.02	101.07±0.02	1983
45	Rh	Rh: Rhodium	102.90549±0.00002	102.91±0.01	2017
46	Pd	Pd: Palladium	106.42±0.01	106.42±0.01	1979
47	Ag	Ag: Silver	107.8682±0.0002	107.87±0.01	1985
48	Cd	Cd: Cadmium	112.414±0.004	112.41±0.01	2013
49	In	In: Indium	114.818±0.001	114.82±0.01	2011
50	Sn	Sn: Tin	118.710±0.007	118.71±0.01	1983
51	Sb	Sb: Antimony	121.760±0.001	121.76±0.01	1993
52	Te	Te: Tellurium	127.60±0.03	127.60±0.03	1969
53	I	I: Iodine	126.90447±0.00003	126.90±0.01	1985
54	Xe	Xe: Xenon	131.293±0.006	131.29±0.01	1999
55	Cs	Cs: Caesium	132.90545196±0.00000006	132.91±0.01	2013
56	Ba	Ba: Barium	137.327±0.007	137.33±0.01	1985
57	La	La: Lanthanum	138.90547±0.00007	138.91±0.01	2005
58	Ce	Ce: Cerium	140.116±0.001	140.12±0.01	1995
59	Pr	Pr: Praseodymium	140.90766±0.00001	140.91±0.01	2017
60	Nd	Nd: Neodymium	144.242±0.003	144.24±0.01	2005
61	Pm	Pm: Promethium
62	Sm	Sm: Samarium	150.36±0.02	150.36±0.02	2005
63	Eu	Eu: Europium	151.964±0.001	151.96±0.01	1995
64	Gd	Gd: Gadolinium	157.249±0.002	157.25±0.01	2024
65	Tb	Tb: Terbium	158.925354±0.000007	158.93±0.01	2021
66	Dy	Dy: Dysprosium	162.500±0.001	162.50±0.01	2001
67	Ho	Ho: Holmium	164.930329±0.000005	164.93±0.01	2021
68	Er	Er: Erbium	167.259±0.003	167.26±0.01	1999
69	Tm	Tm: Thulium	168.934219±0.000005	168.93±0.01	2021
70	Yb	Yb: Ytterbium	173.045±0.010	173.05±0.02	2015
71	Lu	Lu: Lutetium	174.96669±0.00005	174.97±0.01	2024
72	Hf	Hf: Hafnium	178.486±0.006	178.49±0.01	2019
73	Ta	Ta: Tantalum	180.94788±0.00002	180.95±0.01	2005
74	W	W: Tungsten	183.84±0.01	183.84±0.01	1991
75	Re	Re: Rhenium	186.207±0.001	186.21±0.01	1973
76	Os	Os: Osmium	190.23±0.03	190.23±0.03	1991
77	Ir	Ir: Iridium	192.217±0.002	192.22±0.01	2017
78	Pt	Pt: Platinum	195.084±0.009	195.08±0.02	2005
79	Au	Au: Gold	196.966570±0.000004	196.97±0.01	2017
80	Hg	Hg: Mercury (element)	200.592±0.003	200.59±0.01	2011
81	Tl	Tl: Thallium	[204.382, 204.385]	204.38±0.01	2009
82	Pb	Pb: Lead	[206.14, 207.94]	207.2±1.1	2020
83	Bi	Bi: Bismuth	208.98040±0.00001	208.98±0.01	2005
84	Po	Po: Polonium	-
85	At	At: Astatine	-
86	Rn	Rn: Radon	-
87	Fr	Fr: Francium	-
88	Ra	Ra: Radium	-
89	Ac	Ac: Actinium	-
90	Th	Th: Thorium	232.0377±0.0004	232.04±0.01	2013
91	Pa	Pa: Protactinium	231.03588±0.00001	231.04±0.01	2017
92	U	U: Uranium	238.02891±0.00003	238.03±0.01	1999
93	Np	Np: Neptunium	-
94	Pu	Pu: Plutonium	-
95	Am	Am: Americium	-
96	Cm	Cm: Curium	-
97	Bk	Bk: Berkelium	-
98	Cf	Cf: Californium	-
99	Es	Es: Einsteinium	-
100	Fm	Fm: Fermium	-
101	Md	Md: Mendelevium	-
102	No	No: Nobelium	-
103	Lr	Lr: Lawrencium	-
104	Rf	Rf: Rutherfordium	-
105	Db	Db: Dubnium	-
106	Sg	Sg: Seaborgium	-
107	Bh	Bh: Bohrium	-
108	Hs	Hs: Hassium	-
109	Mt	Mt: Meitnerium	-
110	Ds	Ds: Darmstadtium	-
111	Rg	Rg: Roentgenium	-
112	Cn	Cn: Copernicium	-
113	Nh	Nh: Nihonium	-
114	Fl	Fl: Flerovium	-
115	Mc	Mc: Moscovium	-
116	Lv	Lv: Livermorium	-
117	Ts	Ts: Tennessine	-
118	Og	Og: Oganesson	-

↑

(This list: )

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):

Cèṭa'an:CIAAW2009

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

"Atomic weights of the elements 2011 (IUPAC Technical Report)". Pure and Applied Chemistry. 85 (5): 1047–1078. 29 April 2013. doi:10.1351/PAC-REP-13-03-02.

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

Cèṭa'an:CIAAW2013

2015 {{CIAAW2015}} (ytterbium changed):

Cèṭa'an:CIAAW2015

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

Cèṭa'an:CIAAW2017

2019 (hafnium value changed): Meija, Juris; et al. (2019-12-09). "Standard atomic weight of hafnium revised". CIAAW. Retrieved 2020-02-25.
2020* (lead value changed): Zhu, Xiang-Kun; Benefield, Jacqueline; Coplen, Tyler B.; Gao, Zhaofu; Holden, Norman E. (1 October 2020). "Variation of lead isotopic composition and atomic weight in terrestrial materials (IUPAC Technical Report)". 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 "±")

Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry (in Inggris). doi:10.1515/pac-2019-0603. ISSN 1365-3075.
Uncertainty handling

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

Possolo, Antonio; van der Veen, Adriaan M.H.; Meija, Juris; et al. (4 Jan 2018). "Interpreting and propagating the uncertainty of the standard atomic weights (IUPAC Technical Report)". 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 Chart". nucleonica. -- broken/bad access

See also: {{Isotopes table/references}}

Sombher

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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).Cèṭa'an:CIAAW2016^[1]

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

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

{{Infobox element/symbol-to-saw/standard}}, ^[2]

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 ).

CIAAW value updates