Periodic Table of the Elements

with relative atomic masses 1993 according to IUPAC

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18
(I)  (II)  (III) (IV) (V) (VI) (VII) (VIII)
1  2
H  He
1.00794  4.002602

3 4 Atomic number

5 6 7 8 9

10

Li  Be  Symbol  B  C  N  O  F  Ne

6.941 9.012182

Relative atomic mass^{∗}

10.811

12.011

14.00674

15.9994

18.9984032

20.1797
11  12  13  14  15  16  17  18
Na  Mg  Al  Si  P  S  Cl  Ar
22.989768 24.3050  26.981539 28.0855 30.973762 32.066  35.4527  39.948
19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36
K  Ca  Sc  Ti  V  Cr  Mn  Fe  Co  Ni  Cu  Zn  Ga  Ge  As  Se  Br  Kr
39.0983  40.078 44.955910 47.867  50.9415  51.9961 54.93805  55.845  58.93320 58.6934 63.546  65.39  69.723  72.61 74.92159 78.96  79.904  83.80
37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54
Rb  Sr  Y  Zr  Nb  Mo  Tc  Ru  Rh  Pd  Ag  Cd  In  Sn  Sb  Te  I  Xe
85.4678  87.62  88.90585  91.224  92.90638  95.94  (98)  101.07  102.90550 106.42 107.8682 112.411 114.818 118.710 121.760 127.60 126.90447 131.29
55  56  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86
Cs  Ba  La–  Hf  Ta  W  Re  Os  Ir  Pt  Au  Hg  Tl  Pb  Bi  Po  At  Rn
132.90543 137.327  Lu  178.49  180.9479  183.84  186.207  190.23  192.217 195.08 196.96654 200.59 204.3833 207.2 208.98037 (209)  (210)  (222)
87  88  104  105  106  107  108  109  ∗∗
Fr  Ra  Ac–  Db  Jl  Rf  Bh  Hn  Mt
(223)  (226)  Lr  (261)  (262)  (263)  (262)  (265)  (266)
57  58  59  60  61  62  63  64  65  66  67  68  69  70  71
La  Ce  Pr  Nd  Pm  Sm  Eu  Gd  Tb  Dy  Ho  Er  Tm  Yb  Lu
138.9055 140.115  140.90765  144.24  (145)  150.36  151.965 157.25 158.92534 162.50 164.93032 167.26 168.93421 173.04  174.967
89  90  91  92  93  94  95  96  97  98  99  100  101  102  103
Ac  Th  Pa  U  Np  Pu  Am  Cm  Bk  Cf  Es  Fm  Md  No  Lr
(227)  (232.0381) (231.03588) (238.0289) (237)  (239)  (243)  (247)  (247)  (251)  (252)  (257)  (258)  (259)  (262)

∗ Relative atomic mass based on A_{r}(^{12}C) ≡ 12 (after IUPAC “Atomic Weights of the Elements 1993”, Pure and Applied Chemistry, 1994, 66(12), 2423-

2444). For elements which lack stable isotope(s) is the mass number for the most stable isotope given in parentheses, or for Th, Pa and U the relative atomic mass given by IUPAC for the isotopic mixture present on Earth.

∗∗ Chemical symbols for elements 104 – 109 according to IUPAC “Names and Symbols of Transfermium Elements (IUPAC Recommendations 1994)”, Pure

and Applied Chemistry, 1994, 66(12), 2419-2421.

Copyright \begin{matrix}c \\ ◯ \end{matrix} 1995 - 1997 by Mats Dahlgren.