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Elements table


The following table gives the atomic mass of the most abundant or most stable isotope for each element, together with a few others. The percentage abundance or decay mode and half life are also listed.

Proton number Nucleon number Symbol Name Atomic mass
(u)
Half life % or
decay mode
    e Electron 0.000548    
1 1 p Proton 1.007276    
1 1 n Neutron 1.008665 15 mins (free) β-
1 1 H Hydrogen 1.007825   99.985
1 2 D Deuterium 2.014102    
1 3 T Tritium 3.016049 12.3 a β-
2 3 He Helium 3.016030    
2 4 He Helium 4.002 604   ~100
2 5 He Helium 5.012 224 7.6x10-22s n
3 7 Li Lithium 7.016005   92.58
4 8 Be Beryllium 8.005308 ~6x10-17s
4 9 Be Beryllium 9.012 186   100
5 11 B Boron 11.009305   80.4
6 11 C Carbon 11.01143 20.5 mins β+
6 12 C Carbon 12.000000   98.89
6 14 C Carbon 14.003242 5570 a β-
7 13 N Nitrogen 13.005739 10.1 mins β+
7 14 N Nitrogen 14.003074   99.63
8 15 O Oxygen 15.003 066 122 s β+
8 16 O Oxygen 15.994915   99.76
9 18 F Fluorine 18.000 93 6486 s β+ (97%)
9 19 F Fluorine 18.998 40   100
10 20 Ne Neon 19.992440   90.51
10 22 Ne Neon 21.991384   9.22
11 23 Na Sodium 22.989773   100
11 24 Na Sodium 23.99097 15 hours β-
12 24 Mg Magnesium 23.985045   78.7
13 27 Al Aluminium 26.981 635    
14 28 Si Silicon 27.97693    
15 31 P Phosphorus 30.973763    
15 32 P Phosphorus 31.973908 14.5 days β-
16 32 S Sulphur 31.927072   95.0
17 35 Cl Chlorine 34.96885    
18 40 Ar Argon 39.962 384   95.0
19 39 K Potassium 38.96371   93.26
19 40 K Potassium 39.96401 1.3x109 a β-
19 41 K Potassium 38.96371    
19 42 K Potassium 41.9624 12.5 hours β-
20 40 Ca Calcium 39.96259   96.97
20 45 Ca Calcium 44.95619 165 days β-
20 47 Ca Calcium 46.9545 4.7 days β-
21 45 Sc Scandium 44.99592    
22 48 Ti Titanium 47.94795    
23 51 V Vanadium 50.94398    
24 52 Cr Chromium 51.94051    
25 55 Mn Manganese 54.938 88    
26 54 Fe Iron 53.93962   5.82
26 56 Fe Iron 55.934 93   91.66
26 57 Fe Iron 56.93539   2.19
27 59 Co Cobalt 58.933 19   100
27 60 Co Cobalt 59.93381 5.29 a g
28 58 Ni Nickel 57.93534   100
29 63 Cu Copper 62.929 59   69.1
30 64 Zn Zinc 63.92915   48.89
31 69 Ga Gallium 68.9257    
32 74 Ge Germanium 73.9212    
33 75 As Arsenic 74.921    
34 80 Se Selenium 79.91651    
35 79 Br Bromine 78.9184   50.54
35 81 Br Bromine 80.9163   49.46
35 85 Br Bromine 84.938   50.54
36 84 Kr Krypton 83.91150   49.46
37 85 Rb Rubidium 84.911 7    
38 88 Sr Strontium 87.9056   82.6
38 89 Sr Strontium 88.907 51 days β-
38 90 Sr Strontium 84.9117 28 days β-
39 89 Y Yttrium 88.905    
40 90 Zr Zirconium 89.9043    
41 93 Nb Niobium 92.9060    
42 98 Mo Molybdenum 97.906    
43 99 Tc Technetium 98.906* 6 hours γ
43 101 Tc Technetium 100.9059    
44 102 Ru Ruthenium 101.9037    
45 103 Rh Rhodium 102.9048    
46 106 Pd Palladium 105.9036    
47 107 Ag Silver 106.905   54.1
47 111 Ag Silver 110.9052 7.5 days β-
48 114 Cd Cadmium 113.9036    
49 113 In Indium 112.9043    
49 115 In Indium 114.9041 6x1014 a β-
50 120 Sn Tin 119.902    
51 121 Sb Antimony 120.903   57.25
52 122 Te Tellurium 121.903    
53 127 I Iodine 126.90435   100
53 128 I Iodine 127.90583 25 mins β-
53 131 I Iodine 130.906 13 8.04 days β-
53 132 I Iodine 131.907997 138 mins β-
54 129 Xe Xenon 128.904779   26.44
54 132 Xe Xenon 131.90416   26.89
54 133 Xe Xenon 132.9056 5.3 days β-
55 133 Cs Caesium 132.905 1    
55 137 Cs Caesium 136.9068 28 a β-
56 138 Ba Barium 137.9050   71.66
56 139 Ba Barium 138.908 6 85 mins β-
56 140 Ba Barium 139.910 5 12.8 days β-
57 139 La Lanthanum 138.9061   99.91
57 148 La Lanthanum 147.961    
58 140 Ce Cerium 139.9053    
59 141 Pr Praseodymium 140.9074    
60 142 Nd Neodymium 141.9075    
61 147 Pm Promethium 146.9149 2.6 a β-
62 152 Sm Samarium 151.9195    
63 151 Eu Europium 150.919 6    
64 158 Gd Gadolinium 157.9241    
65 159 Tb Terbium 158.925 0    
66 164 Dy Dysprosium 163.9384    
67 165 Ho Holmium 164.9303    
68 166 Er Erbium 165.9304    
69 169 Tm Thulium 168.934    
70 174 Yb Ytterbium 173.9390    
71 175 Lu Lutetium 174.940 9    
72 180 Hf Hafnium 179.9468    
73 181 Ta Tantalum 180.9408    
74 184 W Tungsten 183.9510    
75 185 Re Rhenium 184.953    
76 190 Os Osmium 189.958 3   26.4
76 192 Os Osmium 191.1614   41.0
77 193 Ir Iridium 192.963 3    
78 194 Pt Platinum 193.9628   32.9
78 195 Pt Platinum 194.96482   33.8
79 197 Au Gold 196.966 55   100
79 198 Au Gold 197.96824 2.7 days β-
80 200 Hg Mercury 199.96834   23.1
80 202 Hg Mercury 201.97063   29.8
80 203 Hg Mercury 202.97285 47 days β-
81 205 Tl Thallium 204.97446   70.5
82 206 Pb Lead 205.97446 47 days 24.1
82 208 Pb Lead 207.97644   52.3
82 209 Pb Lead 208.9810 3.3 hours β-
83 209 Bi Bismuth 208.98042   100
83 210 Bi Bismuth 209.98411 3x106 a α
84 209 Po Polonium 208.98246 200 a α
84 210 Po Polonium 209.98287 138 days α
85 210 At Astatine 209.987 8.3 hours α
86 220 Rn Radon 220.0114 52 s α
86 222 Rn Radon 222.017 3.83 days α
87 223 Fr Francium 223.019 8 22 mins β-
88 226 Ra Radium 226.02536 1600 a α
88 228 Ra Radium 228.031 07 1.6x103 a α
89 227 Ac Actinium 227.02781 22 a α
90 232 Th Thorium 232.03821 1.4x1010 a α
91 231 Pa Protoactinium 231.03594 3.4x104 a α
91 233 Pa Protoactinium 233.04011 27.4 days β-
92 235 U Uranium 235.0439 7.1x108 a α
92 238 U Uranium 238.0507 4.5x109 a α
93 237 Np Neptunium 237.04803 2.2x106 a α
94 242 Pu Plutonium 242.0587 3.8x105 a α
95 243 Am Americium 243.06138 8x103 a α
96 245 Cm Curium 245.065 34 104 a α
96 248 Cm Curium Fission 5x105 a  
97 247 Bk Berkelium 247.07018 104 a α
98 249 Cf Californium 249.075 70 360 a α
99 253 Es Einsteinium 253.08468 20 days α
100 250 Fm Fermium 250.079 48 30 mins α
101 255 Md Mendelevium 255.090 6 30 mins α
102 255 No Nobelium 255.0933 3.1 mins α
103 257 Lw Lawrencium 257.099 8 ~35 s α


For an alphabetical list of the elements please see: Table of elements (alphabetical)
 


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© Keith Gibbs 2016