Periodic Table – archives

Earlier versions of the Periodic Table released since 1999

 


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 18
1
H
1.0079
2 13 14 15 16 17 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
3 4 5 6 7 8 9 10 11 12 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 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 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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