Cèṭa'an:Infobox element/symbol-to-saw/year-changed

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• Standard atomic weight

Overview: formal value types of the standard atomic weight
Element (E) ​		Ar°(E)	Value type ​	Ar°(E), abridged or conventional	Mass number [most stable isotope]
hydrogen	1H	[1.00784, 1.00811]	interval	1.0080±0.0002
nitrogen	7N	[14.00643, 14.00728]	interval	14.007±0.001
fluorine	9F	18.998403162±0.000000005	number ± uncertainty	18.998±0.001
calcium	20Ca	40.078±0.004	number ± uncertainty	40.078±0.004
technetium	43Tc	(none)	most stable isotope		Tc: [97]

• Data: /symbol-to-saw
• For most stable isotope mass number (Tc, Rf, Uue etc.) see also {{Infobox element/symbol-to-most-stable-isotope}}.

Usage

Use parameter |format=:

{{Infobox element/symbol-to-saw|format=...}}

• |format=standard (default)
• |format=abridged
• |format=formal-short-rounded
• |format=year-changed
• |format=value-type
• |format=gmr-footnote
• |format=source

For 'most stable isotope' value (Tc, Rf, Uue etc.), see also {{Infobox element/symbol-to-most-stable-isotope}}.

|valformat=

sourcing

{{Infobox element/symbol-to-saw/CIAAW-saw-element-page|Hg|format=source}} →

(element).htm "Standard Atomic Weights: Hg: Mercury (element)". CIAAW. 2011. {{cite web}}: Check |url= value (help)

or as |format=ref

Overview

Tèngghu kèya: Overview, and compare with wikidata

Standard atomic weights of the elements overview page (data)
Z	Symbol	Name	Ar°(E) 2021: Table 1, columns 4, 5	Type	Abridged columns 7, 8	g, m, r	m.s.i.	Year changed
1	H	H: Hydrogen	[1.00784, 1.00811]	2	1.0080±0.0002	m	H:	2009
2	He	He: Helium	4.002602±0.000002	1	4.0026±0.0001	g, r	He:	1983
3	Li	Li: Lithium	[6.938, 6.997]	2	6.94±0.06	m	Li:	2009
4	Be	Be: Beryllium	9.0121831±0.0000005	1	9.0122±0.0001		Be:	2013
5	B	B: Boron	[10.806, 10.821]	2	10.81±0.02	m	B:	2009
6	C	C: Carbon	[12.0096, 12.0116]	2	12.011±0.002		C:	2009
7	N	N: Nitrogen	[14.00643, 14.00728]	2	14.007±0.001	m	N:	2009
8	O	O: Oxygen	[15.99903, 15.99977]	2	15.999±0.001	m	O:	2009
9	F	F: Fluorine	18.998403162±0.000000005	1	18.998±0.001		F:	2021
10	Ne	Ne: Neon	20.1797±0.0006	1	20.180±0.001	g, m	Ne:	1985
11	Na	Na: Sodium	22.98976928±0.00000002	1	22.990±0.001		Na:	2005
12	Mg	Mg: Magnesium	[24.304, 24.307]	2	24.305±0.002		Mg:	2011
13	Al	Al: Aluminium	26.9815384±0.0000003	1	26.982±0.001		Al:	2017
14	Si	Si: Silicon	[28.084, 28.086]	2	28.085±0.001		Si:	2009
15	P	P: Phosphorus	30.973761998±0.000000005	1	30.974±0.001		P:	2013
16	S	S: Sulfur	[32.059, 32.076]	2	32.06±0.02		S:	2009
17	Cl	Cl: Chlorine	[35.446, 35.457]	2	35.45±0.01	m	Cl:	2009
18	Ar	Ar: Argon	[39.792, 39.963]	2	39.95±0.16		Ar:	2017
19	K	K: Potassium	39.0983±0.0001	1	39.098±0.001		K:	1979
20	Ca	Ca: Calcium	40.078±0.004	1	40.078±0.004	g	Ca:	1983
21	Sc	Sc: Scandium	44.955907±0.000004	1	44.956±0.001		Sc:	2021
22	Ti	Ti: Titanium	47.867±0.001	1	47.867±0.001		Ti:	1993
23	V	V: Vanadium	50.9415±0.0001	1	50.942±0.001		V:	1977
24	Cr	Cr: Chromium	51.9961±0.0006	1	51.996±0.001		Cr:	1983
25	Mn	Mn: Manganese	54.938043±0.000002	1	54.938±0.001		Mn:	2017
26	Fe	Fe: Iron	55.845±0.002	1	55.845±0.002		Fe:	1993
27	Co	Co: Cobalt	58.933194±0.000003	1	58.933±0.001		Co:	2017
28	Ni	Ni: Nickel	58.6934±0.0004	1	58.693±0.001	r	Ni:	2007
29	Cu	Cu: Copper	63.546±0.003	1	63.546±0.003	r	Cu:	1969
30	Zn	Zn: Zinc	65.38±0.02	1	65.38±0.02	r	Zn:	2007
31	Ga	Ga: Gallium	69.723±0.001	1	69.723±0.001		Ga:	1987
32	Ge	Ge: Germanium	72.630±0.008	1	72.630±0.008		Ge:	2009
33	As	As: Arsenic	74.921595±0.000006	1	74.922±0.001		As:	2013
34	Se	Se: Selenium	78.971±0.008	1	78.971±0.008	r	Se:	2013
35	Br	Br: Bromine	[79.901, 79.907]	2	79.904±0.003		Br:	2011
36	Kr	Kr: Krypton	83.798±0.002	1	83.798±0.002	g, m	Kr:	2001
37	Rb	Rb: Rubidium	85.4678±0.0003	1	85.468±0.001	g	Rb:	1969
38	Sr	Sr: Strontium	87.62±0.01	1	87.62±0.01	g, r	Sr:	1969
39	Y	Y: Yttrium	88.905838±0.000002	1	88.906±0.001		Y:	2021
40	Zr	Zr: Zirconium	91.222±0.003	1	91.222±0.003	g	Zr:	2024
41	Nb	Nb: Niobium	92.90637±0.00001	1	92.906±0.001		Nb:	2017
42	Mo	Mo: Molybdenum	95.95±0.01	1	95.95±0.01	g	Mo:	2013
43	Tc	Tc: Technetium	-	3			Tc: [97]
44	Ru	Ru: Ruthenium	101.07±0.02	1	101.07±0.02	g	Ru:	1983
45	Rh	Rh: Rhodium	102.90549±0.00002	1	102.91±0.01		Rh:	2017
46	Pd	Pd: Palladium	106.42±0.01	1	106.42±0.01	g	Pd:	1979
47	Ag	Ag: Silver	107.8682±0.0002	1	107.87±0.01	g	Ag:	1985
48	Cd	Cd: Cadmium	112.414±0.004	1	112.41±0.01	g	Cd:	2013
49	In	In: Indium	114.818±0.001	1	114.82±0.01		In:	2011
50	Sn	Sn: Tin	118.710±0.007	1	118.71±0.01	g	Sn:	1983
51	Sb	Sb: Antimony	121.760±0.001	1	121.76±0.01	g	Sb:	1993
52	Te	Te: Tellurium	127.60±0.03	1	127.60±0.03	g	Te:	1969
53	I	I: Iodine	126.90447±0.00003	1	126.90±0.01		I:	1985
54	Xe	Xe: Xenon	131.293±0.006	1	131.29±0.01	g, m	Xe:	1999
55	Cs	Cs: Caesium	132.90545196±0.00000006	1	132.91±0.01		Cs:	2013
56	Ba	Ba: Barium	137.327±0.007	1	137.33±0.01		Ba:	1985
57	La	La: Lanthanum	138.90547±0.00007	1	138.91±0.01	g	La:	2005
58	Ce	Ce: Cerium	140.116±0.001	1	140.12±0.01	g	Ce:	1995
59	Pr	Pr: Praseodymium	140.90766±0.00001	1	140.91±0.01		Pr:	2017
60	Nd	Nd: Neodymium	144.242±0.003	1	144.24±0.01	g	Nd:	2005
61	Pm	Pm: Promethium		3			Pm: [145]
62	Sm	Sm: Samarium	150.36±0.02	1	150.36±0.02	g	Sm:	2005
63	Eu	Eu: Europium	151.964±0.001	1	151.96±0.01	g	Eu:	1995
64	Gd	Gd: Gadolinium	157.249±0.002	1	157.25±0.01	g	Gd:	2024
65	Tb	Tb: Terbium	158.925354±0.000007	1	158.93±0.01		Tb:	2021
66	Dy	Dy: Dysprosium	162.500±0.001	1	162.50±0.01	g	Dy:	2001
67	Ho	Ho: Holmium	164.930329±0.000005	1	164.93±0.01		Ho:	2021
68	Er	Er: Erbium	167.259±0.003	1	167.26±0.01	g	Er:	1999
69	Tm	Tm: Thulium	168.934219±0.000005	1	168.93±0.01		Tm:	2021
70	Yb	Yb: Ytterbium	173.045±0.010	1	173.05±0.02	g	Yb:	2015
71	Lu	Lu: Lutetium	174.96669±0.00005	1	174.97±0.01	g	Lu:	2024
72	Hf	Hf: Hafnium	178.486±0.006	1	178.49±0.01	g	Hf:	2019
73	Ta	Ta: Tantalum	180.94788±0.00002	1	180.95±0.01		Ta:	2005
74	W	W: Tungsten	183.84±0.01	1	183.84±0.01		W:	1991
75	Re	Re: Rhenium	186.207±0.001	1	186.21±0.01		Re:	1973
76	Os	Os: Osmium	190.23±0.03	1	190.23±0.03	g	Os:	1991
77	Ir	Ir: Iridium	192.217±0.002	1	192.22±0.01		Ir:	2017
78	Pt	Pt: Platinum	195.084±0.009	1	195.08±0.02		Pt:	2005
79	Au	Au: Gold	196.966570±0.000004	1	196.97±0.01		Au:	2017
80	Hg	Hg: Mercury (element)	200.592±0.003	1	200.59±0.01		Hg:	2011
81	Tl	Tl: Thallium	[204.382, 204.385]	2	204.38±0.01		Tl:	2009
82	Pb	Pb: Lead	[206.14, 207.94]	2	207.2±1.1		Pb:	2020
83	Bi	Bi: Bismuth	208.98040±0.00001	1	208.98±0.01		Bi:	2005
84	Po	Po: Polonium	-	3			Po: [209]
85	At	At: Astatine	-	3			At: [210]
86	Rn	Rn: Radon	-	3			Rn: [222]
87	Fr	Fr: Francium	-	3			Fr: [223]
88	Ra	Ra: Radium	-	3			Ra: [226]
89	Ac	Ac: Actinium	-	3			Ac: [227]
90	Th	Th: Thorium	232.0377±0.0004	1	232.04±0.01	g	Th:	2013
91	Pa	Pa: Protactinium	231.03588±0.00001	1	231.04±0.01		Pa:	2017
92	U	U: Uranium	238.02891±0.00003	1	238.03±0.01	g, m	U:	1999
93	Np	Np: Neptunium	-	3			Np: [237]
94	Pu	Pu: Plutonium	-	3			Pu: [244]
95	Am	Am: Americium	-	3			Am: [243]
96	Cm	Cm: Curium	-	3			Cm: [247]
97	Bk	Bk: Berkelium	-	3			Bk: [247]
98	Cf	Cf: Californium	-	3			Cf: [251]
99	Es	Es: Einsteinium	-	3			Es: [252]
100	Fm	Fm: Fermium	-	3			Fm: [257]
101	Md	Md: Mendelevium	-	3			Md: [258]
102	No	No: Nobelium	-	3			No: [259]
103	Lr	Lr: Lawrencium	-	3			Lr: [266]
104	Rf	Rf: Rutherfordium	-	3			Rf: [267]
105	Db	Db: Dubnium	-	3			Db: [268]
106	Sg	Sg: Seaborgium	-	3			Sg: [267]
107	Bh	Bh: Bohrium	-	3			Bh: [270]
108	Hs	Hs: Hassium	-	3			Hs: [271]
109	Mt	Mt: Meitnerium	-	3			Mt: [278]
110	Ds	Ds: Darmstadtium	-	3			Ds: [281]
111	Rg	Rg: Roentgenium	-	3			Rg: [282]
112	Cn	Cn: Copernicium	-	3			Cn: [285]
113	Nh	Nh: Nihonium	-	3			Nh: [286]
114	Fl	Fl: Flerovium	-	3			Fl: [289]
115	Mc	Mc: Moscovium	-	3			Mc: [290]
116	Lv	Lv: Livermorium	-	3			Lv: [293]
117	Ts	Ts: Tennessine	-	3			Ts: [294]
118	Og	Og: Oganesson	-	3			Og: [294]
119	Uue	Uue: Ununennium	-				Uue:
120	Ubn	Ubn: Unbinilium	-				Ubn:
121	Ubu	Ubu: Unbiunium	-				Ubu:
122	Ubb	Ubb: Unbibium	-				Ubb:
124	Ubq	Ubq: Unbiquadium	-				Ubq:
126	Ubh	Ubh: Unbihexium	-				Ubh:

g	Geological and biological materials are known in which the element has an isotopic composition outside the limits for normal material. The difference between the atomic weight of the element in such materials and that given in the table may exceed the stated uncertainty.
m	Modified isotopic compositions may be found in commercially available material because the material has been subjected to some undisclosed or inadvertent isotopic fractionation. Substantial deviations in atomic weight of the element from that given in the table can occur.
r	Range in isotopic composition of normal terrestrial material prevents a more precise standard atomic weight being given; the tabulated value and uncertainty should be applicable to normal material.

References

Updates

  (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}}

Data templates to update

• {{Infobox element/symbol-to-saw}} -- meta

data

{{CIAAW2021}}

• {{Infobox element/symbol-to-saw/standard}}
• {{Infobox element/symbol-to-saw/abridged}}
• {{Infobox element/symbol-to-saw/formal-short-rounded}}

secondary data

• {{Infobox element/symbol-to-saw/formal-short-rounded}} -- uncertainties removed; informal (e.g., in periodic table)
• {{Infobox element/symbol-to-saw/year-changed}} -- by CIAAW
• {{Infobox element/symbol-to-saw/value-type}}
• {{Infobox element/symbol-to-saw/gmr-footnote}}

See also

• {{Standard atomic weight of the elements}} - list, mainspace
• {{Infobox element/standard atomic weight/value illustration}} - illustrative table with 6 examples, mainspace

• {{Infobox element/symbol-to-saw/overview}}
• {{Infobox element/symbol-to-saw/overview-compare-wikidata}} -- compares values with WD values

• {{Infobox element/symbol-to-most-stable-isotope}}

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