Periodic Table - archives - IUPAC | International Union of Pure and Applied Chemistry

Earlier versions of the Periodic Table released since 1999

4 May 2022 [current version]
1 Dec 2018 [pdf file, letter size or A4 or A3 (PDF) version] including the most recent updates released in June 2018 by the IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) (see related News, released 5 June 2018), and specifically for argon, the assignment of an interval for the new standard atomic weight which reflects the common occurrence of variations in the atomic weights of the element in normal terrestrial materials. An interval in square brackets provides the lower and upper bounds of the standard atomic weight for that element. For users needing an atomic-weight value for an unspecified sample with disregard to the uncertainty, the conventional values are provided. No values are listed for elements which lack isotopes with a characteristic isotopic abundance in natural terrestrial samples. See PAC for more details or visit Commission II.1. Reprint as back cover tear off Chemistry International Jan-Mar 2019 issue.
28 Nov 2016 [pdf file, letter size or A4 or A3 (PDF) version] including the added elements 113, 115, 117, and 118 with their names and symbols (see related News), the standard atomic weights 2013 (abridged to five significant digits) and the conventional atomic weights as published in PAC Vol. 88, No.3, pp. 265-291 (https://dx.doi.org/10.1515/pac-2015-0305), and for ytterbium, the standard atomic weight updated following the 2015 review (see related News). An interval in square brackets provides the lower and upper bounds of the standard atomic weight for that element. For users needing an atomic-weight value for an unspecified sample with disregard to the uncertainty, the conventional values are provided. No values are listed for elements which lack isotopes with a characteristic isotopic abundance in natural terrestrial samples; reprint as back cover tear off Chemistry International Jan-Mar 2017 issue.

8 Jan 2016 [pdf file – 109 KB] including Uut, Uup, Uus, and Uuo and following the announcement on 30 Dec 2015 of the discoveries of four new chemical elements. This table includes the recently added elements 113, 115, 117, and 118 with their temporary names and symbols (see related News, released 30 Dec 2015), the standard atomic weights 2013 (abridged to four significant digits and as deduced from PAC 88, No.3 (2016) https://dx.doi.org/10.1515/pac-2015-0305), and for ytterbium, the standard atomic weight updated following the 2015 review (see related News, released 24 Aug 2015).
1 May 2013 [pdf file – 88 KB] including the standard atomic weights 2011 abridged to four significant digits (as published in PAC 85, table 4, p. 1068; doi.org/10.1351/PAC-REP-13-03-02; reprint as back cover tear off Chemistry International Jul-Aug 2013 issue.
11 June 2012 [pdf file – 88KB] including Fl and Lv (The IUPAC recommendations of the names and symbols of the elements with atomic numbers 114 and 116 is to appear in PAC July 2012; https://dx.doi.org/10.1351/PAC-REC-11-12-03); CI tear off Jul-Aug 2012 issue
Jul-Aug 2011 — Periodic Table of the Isotopes — [pdf file – 928KB] – see related Chem Int article ; see Interactive version release 16 Aug 2016
21 January 2011 [pdf file – 135KB] including the standard atomic weights 2009 abridged to four significant digits (as published in PAC 83, table 4, p. 387 [doi.org/10.1351/PAC-REP-10-09-14]) – see related Chem Int feature (Mar-Apr 2011 issue)
19 February 2010 [pdf file – 196KB] including the standard atomic weights 2007 abridged to four significant digits (as published in PAC 81, table 4, p. 2141 [doi:10.1351/PAC-REP-09-08-03]) and the latest named element copernicium > see CI notice
23 August 2007 [pdf file – 201KB] (version date 23 August 2007) including the 2007 revised standard atomic weights of 5 chemical elements > see release published in Chem. Int. Nov 2007
22 June 2007 [pdf file – 28KB] sized to print on A4 and US letter paper, including the 2005 revised standard atomic weights of 16 chemical elements >see release published in Chem. Int. Nov-Dec 2005
3 Oct 2005 [pdf file – 17KB] or see CI tear off version May-June 2006 issue [pdf file – 68KB]
4 Feb 2005 [pdf file – 17KB]; CI tear off Mar-Apr 2005 issue [pdf file – 87KB]
1 Nov 2004 [pdf file – 17KB]
7 Nov 2003 [pdf file – 17KB]; CI Jan-Feb 2004 issue tear-off table [pdf file – 474KB], and a brief historical review of the table, see Chem. Int. 2004, Jan , p. 8

In this version below, each element is keyed to a color matching the time of its discovery

Time
of Discovery

Before
1800

1800-1849

1850-1899

1900-1949

1950-1999

1
H
1.0079

2
He
4.0026

3
Li
6.941

4
Be
9.0122

5
B
10.811

6
C
12.011

7
N
14.007

8
O
15.999

9
F
18.998

10
Ne
20.180

11
Na
22.990

12
Mg
24.305

13
Al
26.982

14
Si
28.086

15
P
30.974

16
S
32.065

17
Cl
35.453

18
Ar
39.948

19
K
39.098

20
Ca
40.078

21
Sc
44.956

22
Ti
47.867

23
V
50.942

24
Cr
51.996

25
Mn
54.938

26
Fe
55.845

27
Co
58.933

28
Ni
58.693

29
Cu
63.546

30
Zn
65.38

31
Ga
69.723

32
Ge
72.64

33
As
74.922

34
Se
78.96

35
Br
79.904

36
Kr
83.798

37
Rb
85.468

38
Sr
87.62

39
Y
88.906

40
Zr
91.224

41
Nb
92.906

42
Mo
95.96

43
Tc
–

44
Ru
101.07

45
Rh
102.91

46
Pd
106.42

47
Ag
107.87

48
Cd
112.41

49
In
114.82

50
Sn
118.71

51
Sb
121.76

52
Te
127.60

53
I
126.90

54
Xe
131.29

55
Cs
132.91

56
Ba
137.33

57-71

72
Hf
178.49

73
Ta
180.95

74
W
183.84

75
Re
186.21

76
Os
190.23

77
Ir
192.22

78
Pt
195.08

79
Au
196.97

80
Hg
200.59

81
Tl
204.38

82
Pb
207.2

83
Bi
208.98

84
Po
–

85
At
–

86
Rn
–

87
Fr
–

88
Ra
–

89-103

104
Rf
–

105
Db
–

106
Sg
–

107
Bh
–

108
Hs
–

109
Mt
–

110
Ds
–

111
Rg
–

112
Cn
–

113
Nh
–

114
Fl
–

115
Mc
–

116
Lv
–

117
Ts
–

118
Og
–

La 150.36

La
150.36

57
La
138.91

58
Ce
140.12

59
Pr
140.91

60
Nd
144.24

61
Pm
–

62
Sm
150.36

63
Eu
151.96

64
Gd
157.25

65
Tb
158.93

66
Dy
162.50

67
Ho
164.93

68
Er
167.26

69
Tm
168.93

70
Yb
173.05

71
Lu
174.97

La 150.36

La
150.36

89
Ac
–

90
Th
232.04

91
Pa
231.04

92
U
238.03

93
Np
–

94
Pu
–

95
Am
–

96
Cm
–

97
Bk
–

98
Cf
–

99
Es
–

100
Fm
–

101
Md
–

102
No
–

103
Lr
–

Notes

– Standard atomic weights last revised based on the 2005 review published in Pure Appl. Chem. 78(11), 2051-2066, 2006 (doi.org/10.1351/pac200678112051) and Aug 2007 release (also in Chem. Int. Nov 2007), and here reported to 5 significant figures. Elements with no reported values in the table above have no stable nuclides (alternative tables might display mean relative atomic masses or mass numbers for an arbitrarily selected unstable nuclide of that chemical element). However, three such elements -Th, Pa, and U- have a characteristic terresterial isotopic composition, and for these an atomic weight is tabulated.

A similar table, commemorative of IUPAC 80 Years of Service to Chemistry was produced as a laminated postcard and distributed with the Nov. 2000 issue of Chemistry International

Symbol	name	Symbol	name	Symbol	name
Ac	actinium	Gd	gadolinium	Pd	palladium
Ag	silver*	Ge	germanium	Pm	promethium
Al	aluminium⁺	H	hydrogen	Po	polonium
Am	americium	He	helium	Pr	praseodymium
Ar	argon	Hf	hafnium	Pt	platinum
As	arsenic	Hg	mercury*	Pu	plutonium
At	astatine	Ho	holmium	Ra	radium
Au	gold*	Hs	hassium	Rb	rubidium
B	boron	I	iodine	Re	rhenium
Ba	barium	In	indium	Rf	rutherfordium
Be	beryllium	Ir	iridium	Rg	roentgenium
Bh	bohrium	K	potassium*	Rh	rhodium
Bi	bismuth	Kr	krypton	Rn	radon
Bk	berkelium	La	lanthanum	Ru	ruthenium
Br	bromine	Li	lithium	S	sulfur
C	carbon	Lr	lawrencium	Sb	antimony*
Ca	calcium	Lu	lutetium	Sc	scandium
Cd	cadmium	Lv	livermorium	Se	selenium
Ce	cerium	Mc	moscovium	Sg	seaborgium
Cf	californium	Md	mendelevium	Si	silicon
Cl	chlorine	Mg	magnesium	Sm	samarium
Cm	curium	Mn	manganese	Sn	tin*
Cn	copernicium	Mo	molybdenum	Sr	strontium
Co	cobalt	Mt	meitnerium	Ta	tantalum
Cr	chromium	N	nitrogen	Tb	terbium
Cs	caesium⁺	Na	sodium*	Tc	technetium
Cu	copper*	Nb	niobium	Te	tellurium
Db	dubnium	Nd	neodymium	Th	thorium
Ds	darmstadtium	Ne	neon	Ti	titanium
Dy	dysprosium	Nh	nihonium	Tl	thallium
Er	erbium	Ni	nickel	Tm	thulium
Es	einsteinium	No	nobelium	Ts	tennessine
Eu	europium	Np	neptunium	U	uranium
F	fluorine	O	oxygen	V	vanadium
Fe	iron*	Og	oganesson	W	tungsten*
Fl	flerovium	Os	osmium	Xe	xenon
Fm	fermium	P	phosphorus	Y	yttrium
Fr	francium	Pa	protactinium	Yb	ytterbium
Ga	gallium	Pb	lead*	Zn	zinc
				Zr	zirconium

* Some element symbols derive from ancient names; Ag derives from argentum, Au from aurum, Cu from cuprum, Fe from ferrum, Hg from hydrargyrum, K from kalium, Na from natrium, Pb from plumbum, Sb from stibium, Sn from stannum, and W from wolfram.
+ Alternative spellings commonly used are: ‘aluminum’ for Al and ‘cesium’ for Cs.

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