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• Standard atomic weight

Overview: formal values of the standard atomic weight
Element (E) ​		Ar, standard(E) Table 1	Value type ​	Ar, std abridged(E) Table 2	Ar, std conventional(E) Table 3	Ar, std formal short(E) Tables 2 and 3	Mass number [most stable isotope]
hydrogen	1H	[1.00784, 1.00811]	interval	[1.0078, 1.0082]	1.008	1.008
nitrogen	7N	[14.00643, 14.00728]	interval	[14.006, 14.008]	14.007	14.007
fluorine	9F	18.998403163(6)	number ± uncertainty	18.998		18.998
calcium	20Ca	40.078(4)	number ± uncertainty	40.078(4)		40.078(4)
technetium	43Tc	(none)	most stable isotope				[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=conventional:
• |format=formal-short:
• |format=formal-short-rounded:
• |format=plain-short-value:
• |format=year-changed:
• |format=value-type:

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

Overview

See also: Overview, and compare with wikidata

Standard atomic weights of the elements overview page (data)
Z	Symbol	Name	Ar, standard Table 1	Type	Abridged Table 2	Conventional Table 3	→ Short Table 2, 3	→ Short- rounded	m.s.i.	Year changed	Note
1	H	hydrogen	[1.00784, 1.00811]	2	[1.0078, 1.0082]	1.008	1.008	1.008		2009[1]
2	He	helium	4.002602(2)	1	4.0026		4.0026	4.0026		1983[2]
3	Li	lithium	[6.938, 6.997]	2	[6.938, 6.997]	6.94	6.94	6.94		2009[3]
4	Be	beryllium	9.0121831(5)	1	9.0122		9.0122	9.0122		2013[4]
5	B	boron	[10.806, 10.821]	2	[10.806, 10.821]	10.81	10.81	10.81		2009[5]
6	C	carbon	[12.0096, 12.0116]	2	[12.009, 12.012]	12.011	12.011	12.011		2009[6]
7	N	nitrogen	[14.00643, 14.00728]	2	[14.006, 14.008]	14.007	14.007	14.007		2009[7]
8	O	oxygen	[15.99903, 15.99977]	2	[15.999, 16.000]	15.999	15.999	15.999		2009[8]
9	F	fluorine	18.998403163(6)	1	18.998		18.998	18.998		2013[9]
10	Ne	neon	20.1797(6)	1	20.180		20.180	20.180		1985[10]
11	Na	sodium	22.98976928(2)	1	22.990		22.990	22.990		2005[11]
12	Mg	magnesium	[24.304, 24.307]	2	[24.304, 24.307]	24.305	24.305	24.305		2011[12]
13	Al	aluminium	26.9815384(3)	1	26.982		26.982	26.982		2017[13]
14	Si	silicon	[28.084, 28.086]	2	[28.084, 28.086]	28.085	28.085	28.085		2009[14]
15	P	phosphorus	30.973761998(5)	1	30.974		30.974	30.974		2013[15]
16	S	sulfur	[32.059, 32.076]	2	[32.059, 32.076]	32.06	32.06	32.06		2009[16]
17	Cl	chlorine	[35.446, 35.457]	2	[35.446, 35.457]	35.45	35.45	35.45		2009[17]
18	Ar	argon	[39.792, 39.963]	2	[39.792, 39.963]	39.95	39.95	39.95		2017[18]
19	K	potassium	39.0983(1)	1	39.098		39.098	39.098		1979[19]
20	Ca	calcium	40.078(4)	1	40.078(4)		40.078(4)	40.078		1983[20]
21	Sc	scandium	44.955908(5)	1	44.956		44.956	44.956		2013[21]
22	Ti	titanium	47.867(1)	1	47.867		47.867	47.867		1993[22]
23	V	vanadium	50.9415(1)	1	50.942		50.942	50.942		1977[23]
24	Cr	chromium	51.9961(6)	1	51.996		51.996	51.996		1983[24]
25	Mn	manganese	54.938043(2)	1	54.938		54.938	54.938		2017[25]
26	Fe	iron	55.845(2)	1	55.845(2)		55.845(2)	55.845		1993[26]
27	Co	cobalt	58.933194(3)	1	58.933		58.933	58.933		2017[27]
28	Ni	nickel	58.6934(4)	1	58.693		58.693	58.693		2007[28]
29	Cu	copper	63.546(3)	1	63.546(3)		63.546(3)	63.546		1969[29]
30	Zn	zinc	65.38(2)	1	65.38(2)		65.38(2)	65.38		2007[30]
31	Ga	gallium	69.723(1)	1	69.723		69.723	69.723		1987[31]
32	Ge	germanium	72.630(8)	1	72.630(8)		72.630(8)	72.630		2009[32]
33	As	arsenic	74.921595(6)	1	74.922		74.922	74.922		2013[33]
34	Se	selenium	78.971(8)	1	78.971(8)		78.971(8)	78.971		2013[34]
35	Br	bromine	[79.901, 79.907]	2	[79.901, 79.907]	79.904	79.904	79.904		2011[35]
36	Kr	krypton	83.798(2)	1	83.798(2)		83.798(2)	83.798		2001[36]
37	Rb	rubidium	85.4678(3)	1	85.468		85.468	85.468		1969[37]
38	Sr	strontium	87.62(1)	1	87.62		87.62	87.62		1969[38]
39	Y	yttrium	88.90584(1)	1	88.906		88.906	88.906		2017[39]
40	Zr	zirconium	91.224(2)	1	91.224(2)		91.224(2)	91.224		1983[40]
41	Nb	niobium	92.90637(1)	1	92.906		92.906	92.906		2017[41]
42	Mo	molybdenum	95.95(1)	1	95.95		95.95	95.95		2013[42]
43	Tc	technetium	-	3					[97]
44	Ru	ruthenium	101.07(2)	1	101.07(2)		101.07(2)	101.07		1983[43]
45	Rh	rhodium	102.90549(2)	1	102.91		102.91	102.91		2017[44]
46	Pd	palladium	106.42(1)	1	106.42		106.42	106.42		1979[45]
47	Ag	silver	107.8682(2)	1	107.87		107.87	107.87		1985[46]
48	Cd	cadmium	112.414(4)	1	112.41		112.41	112.41		2013[47]
49	In	indium	114.818(1)	1	114.82		114.82	114.82		2011[48]
50	Sn	tin	118.710(7)	1	118.71		118.71	118.71		1983[49]
51	Sb	antimony	121.760(1)	1	121.76		121.76	121.76		1993[50]
52	Te	tellurium	127.60(3)	1	127.60(3)		127.60(3)	127.60		1969[51]
53	I	iodine	126.90447(3)	1	126.90		126.90	126.90		1985[52]
54	Xe	xenon	131.293(6)	1	131.29		131.29	131.29		1999[53]
55	Cs	caesium	132.90545196(6)	1	132.91		132.91	132.91		2013[54]
56	Ba	barium	137.327(7)	1	137.33		137.33	137.33		1985[55]
57	La	lanthanum	138.90547(7)	1	138.91		138.91	138.91		2005[56]
58	Ce	cerium	140.116(1)	1	140.12		140.12	140.12		1995[57]
59	Pr	praseodymium	140.90766(1)	1	140.91		140.91	140.91		2017[58]
60	Nd	neodymium	144.242(3)	1	144.24		144.24	144.24		2005[59]
61	Pm	promethium	-	3					[145]
62	Sm	samarium	150.36(2)	1	150.36(2)		150.36(2)	150.36		2005[60]
63	Eu	europium	151.964(1)	1	151.96		151.96	151.96		1995[61]
64	Gd	gadolinium	157.25(3)	1	157.25(3)		157.25(3)	157.25		1969[62]
65	Tb	terbium	158.925354(8)	1	158.93		158.93	158.93		2017[63]
66	Dy	dysprosium	162.500(1)	1	162.50		162.50	162.50		2001[64]
67	Ho	holmium	164.930328(7)	1	164.93		164.93	164.93		2017[65]
68	Er	erbium	167.259(3)	1	167.26		167.26	167.26		1999[66]
69	Tm	thulium	168.934218(6)	1	168.93		168.93	168.93		2017[67]
70	Yb	ytterbium	173.045(10)	1	173.05		173.05	173.05		2015[68]
71	Lu	lutetium	174.9668(1)	1	174.97		174.97	174.97		2007[69]
72	Hf	hafnium	178.486(6)	1	178.49		178.49(2)	178.49		2019[70]
73	Ta	tantalum	180.94788(2)	1	180.95		180.95	180.95		2005[71]
74	W	tungsten	183.84(1)	1	183.84		183.84	183.84		1991[72]
75	Re	rhenium	186.207(1)	1	186.21		186.21	186.21		1973[73]
76	Os	osmium	190.23(3)	1	190.23(3)		190.23(3)	190.23		1991[74]
77	Ir	iridium	192.217(2)	1	192.22		192.22	192.22		2017[75]
78	Pt	platinum	195.084(9)	1	195.08		195.08	195.08		2005[76]
79	Au	gold	196.966570(4)	1	196.97		196.97	196.97		2017[77]
80	Hg	mercury	200.592(3)	1	200.59		200.59	200.59		2011[78]
81	Tl	thallium	[204.382, 204.385]	2	[204.38, 204.39]	204.38	204.38	204.38		2009[79]
82	Pb	lead	[206.14, 207.94]	1	207.2		207.2	207.2		1969[80]
83	Bi	bismuth	208.98040(1)	1	208.98		208.98	208.98		2005[81]
84	Po	polonium	-	3					[209]
85	At	astatine	-	3					[210]
86	Rn	radon	-	3					[222]
87	Fr	francium	-	3					[223]
88	Ra	radium	-	3					[226]
89	Ac	actinium	-	3					[227]
90	Th	thorium	232.0377(4)	1	232.04		232.04	232.04		2013[82]
91	Pa	protactinium	231.03588(1)	1	231.04		231.04	231.04		2017[83]
92	U	uranium	238.02891(3)	1	238.03		238.03	238.03		1999[84]
93	Np	neptunium	-	3					[237]
94	Pu	plutonium	-	3					[244]
95	Am	americium	-	3					[243]
96	Cm	curium	-	3					[247]
97	Bk	berkelium	-	3					[247]
98	Cf	californium	-	3					[251]
99	Es	einsteinium	-	3					[252]
100	Fm	fermium	-	3					[257]
101	Md	mendelevium	-	3					[258]
102	No	nobelium	-	3					[259]
103	Lr	lawrencium	-	3					[266]
104	Rf	rutherfordium	-	3					[267]
105	Db	dubnium	-	3					[268]
106	Sg	seaborgium	-	3					[269]
107	Bh	bohrium	-	3					[270]
108	Hs	hassium	-	3					[269]
109	Mt	meitnerium	-	3					[278]
110	Ds	darmstadtium	-	3					[281]
111	Rg	roentgenium	-	3					[282]
112	Cn	copernicium	-	3					[285]
113	Nh	nihonium	-	3					[286]
114	Fl	flerovium	-	3					[289]
115	Mc	moscovium	-	3					[290]
116	Lv	livermorium	-	3					[293]
117	Ts	tennessine	-	3					[294]
118	Og	oganesson	-	3					[294]
119	Uue	ununennium	-							[85]
120	Ubn	unbinilium	-							[86]
121	Ubu	unbiunium	-							[87]
122	Ubb	unbibium	-							[88]
124	Ubq	unbiquadium	-							[89]
126	Ubh	unbihexium	-							[90]

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):

"Atomic weights of the elements 2009 (IUPAC Technical Report)". Pure Appl. Chem. 83 (2): 359–396. 12 December 2010. doi:10.1351/PAC-REP-10-09-14.

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

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

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

Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.

• 2015 {{CIAAW2015}} (ytterbium changed):

"Standard Atomic Weight of Ytterbium Revised". Chemistry International. 37 (5–6): 26. October 2015. doi:10.1515/ci-2015-0512. eISSN 0193-6484. ISSN 0193-6484.

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

"Standard atomic weights of 14 chemical elements revised". CIAAW. 2018-06-05.

• 2019 (hafnium value changed): Meija, Juris; et al. (2019-12-09). "Standard atomic weight of hafnium revised". CIAAW. Retrieved 2020-02-25.

About handling the uncertainty in the values, including the [ ] 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.

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-wikidata}} -- compares values with WD values

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

• {{Infobox element/standard atomic weight}} - {{Infobox element}} (talk) formatter

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