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Elements table - alphabetical list


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

Name Symbol Proton number Nucleon number Atomic mass
(u)
Half life % or
decay mode
Actinium Ac 89 227 227.027 81 22 years a
Aluminium Al 13 27 26.981 635    
Americium Am 95 243 243.061 38 8x103 years a
Antimony Sb 51 121 120.903   57.25
Argon Ar 18 40 39.962 384   95.0
Arsenic As 33 75 74.921    
Astatine At 85 210 209.987 8.3 hours a
Barium Ba 56 138 137.905 0   71.66
Barium Ba 56 139 138.908 6 85 mins b-
Barium Ba 56 140 139.910 5 12.8 days b-
Berkelium Bk 97 247 247.070 18 104 years a
Beryllium Be 4 8 8.005 308 ~6x10-17s 2a
Beryllium Be 4 9 9.012 186   100
Bismuth Bi 83 209 208.980 42   100
Bismuth Bi 83 210 209.984 11 3x106 years a
Boron B 5 11 11.009 305   80.4
Bromine Br 35 79 78.918 4   50.54
Bromine Br 35 81 80.916 3   49.46
Bromine Br 35 85 84.938   50.54
Cadmium Cd 48 114 113.903 6    
Caesium Cs 55 133 132.905 1    
Caesium Cs 55 137 136.9068 28 years b-
Californium Cf 98 249 249.075 70 360 years a
Carbon C 6 11 11.011 43 20.5 mins b+
Carbon C 6 12 12.000 000   98.89
Carbon C 6 14 14.003 242 5570 years b-
Calcium Ca 20 40 39.962 59   96.97
Calcium Ca 20 45 44.956 19 165 days b-
Calcium Ca 20 47 46.954 5 4.7 days b-
Cerium Ce 58 140 139.905 3    
Chlorine Cl 17 35 34.968 85    
Cobalt Co 27 59 58.933 19   100
Cobalt Co 27 60 59.933 81 5.29 years g
Chromium Cr 24 52 51.940 51    
Copper Cu 29 63 62.929 59   69.1
Curium Cm 96 245 245.065 34 104 years a
Curium Cm 96 248 Fission 5x105 years  
Deuterium D 1 2 2.014 102    
Dysprosium Dy 66 164 163.938 4    
Einsteinium Es 99 253 253.084 68 20 days a
Electron e 0 0 0.000 548    
Erbium Er 68 166 165.930 4    
Europium Eu 63 151 150.919 6    
Fermium Fm 100 250 250.079 48 30 mins a
Fluorine F 9 19 18.998 40   100
Francium Fr 87 223 223.019 8 22 mins b-
Gadolinium Gd 64 158 157.924 1    
Gallium Ga 31 69 68.925 7    
Germanium Ge 32 74 73.921 2    
Gold Au 79 197 196.966 55   100
Gold Au 79 198 197.968 24 2.7 days b-
Hafnium Hf 72 180 179.946 8    
Helium He 2 3 3.016 030    
Helium He 2 4 4.002 604   ~100
Helium He 2 5 5.012 224 7.6x10-22s n
Holmium Ho 67 165 164.930 3    
Hydrogen H 1 1 1.007 825   99.985
Hydrogen H 1 2 2.014 102    
Hydrogen H 1 3 3.016 049 12.3 years b-
Indium In 49 113 112.904 3    
Indium In 49 115 114.904 1 6x1014 years b-
Iodine I 53 127 126.904 35   100
Iodine I 53 128 127.905 83 25 mins b-
Iodine I 53 131 130.906 13 8.04 days b-
Iodine I 53 132 131.907 997 138 mins b-
Iridium Ir 77 193 192.963 3    
Iron Fe 26 54 53.939 62   5.82
Iron Fe 26 56 55.934 93   91.66
Iron Fe 26 57 56.935 39   2.19
Krypton Kr 36 84 83.911 50   49.46
Lanthanum La 57 139 138.906 1   99.91
Lanthanum La 57 148 147.961    
Lawrencium Lw 103 257 257.099 8 ~35 s a
Lead Pb 82 206 205.974 46 47 days 24.1
Lead Pb 82 208 207.976 44   52.3
Lead Pb 82 209 208.981 0 3.3 hours b-
Lithium Li 3 7 7.016 005   92.58
Lutetium Lu 71 175 174.940 9    
Magnesium Mg 12 24 23.985 045   78.7
Manganese Mn 25 55 54.938 88    
Mendelevium Md 101 255 255.090 6 30 mins a
Mercury Hg 80 200 199.968 34   23.1
Mercury Hg 80 202 201.970 63   29.8
Mercury Hg 80 203 202.972 85 47 days b-
Molybdenum Mo 42 98 97.906    
Neodymium Nd 60 142 141.907 5    
Neptunium Np 93 237 237.048 03 2.2x106 years a
Neon Ne 10 20 19.992 440   90.51
Neon Ne 10 22 21.991 384   9.22
Neutron n 1 1 1.008 665 15 mins (free) b-
Nickel Ni 28 58 57.935 34   100
Niobium Nb 41 93 92.906 0    
Nitrogen N 7 13 13.005 739 10.1 mins b+
Nitrogen N 7 14 14.003 074   99.63
Nobelium No 102 255 255.093 3 3.1 mins a
Osmium Os 76 190 189.958 3   26.4
Osmium Os 76 192 191.161 4   41.0
Oxygen O 8 15 15.003 066 122 s b+
Oxygen O 8 16 15.994 915   99.76
Palladium Pd 46 106 105.9036    
Phosphorus P 15 31 30.973 763    
Phosphorus P 15 32 31.973 908 14.5 days b-
Platinum Pt 78 194 193.962 8   32.9
Platinum Pt 78 195 194.964 82   33.8
Plutonium Pu 94 242 242.058 7 3.8x105 years a
Polonium Po 84 209 208.982 46 200 years a
Polonium Po 84 210 209.982 87 138 days a
Potassium K 19 39 38.963 71   93.26
Potassium K 19 40 39.964 01 1.28x109 years b-
Potassium K 19 41 38.963 71    
Potassium K 19 42 41.962 4 12.5 hours b-
Praseodymium Pr 59 141 140.907 4    
Promethium Pm 61 147 146.914 9 2.6 years b-
Protoactinium Pa 91 231 231.035 94 3.4x104 years a
Protoactinium Pa 91 233 233.040 11 27.4 days b-
Proton p 1 1 1.007 276    
Radon Rn 86 220 220.011 4 52 s a
Radon Rn 86 222 222.017 3.83 days a
Radium Ra 88 226 226.025 36 1600 years a
Radium Ra 88 228 228.031 07 1.6x103 years a
Rhenium Re 75 185 184.953    
Rhodium Rh 45 103 102.904 8    
Rubidium Rb 37 85 84.911 7    
Ruthenium Ru 44 102 101.903 7    
Samarium Sm 62 152 151.919 5    
Scandium Sc 21 45 44.995 92    
Selenium Se 34 80 79.916 51    
Silicon Si 14 28 27.976 93    
Silver Ag 47 107 106.905   54.1
Silver Ag 47 111 110.905 2 7.5 days b-
Sodium Na 11 23 22.989 773   100
Sodium Na 11 24 23.990 97 15 hours b-
Strontium Sr 38 88 87.905 6   82.6
Strontium Sr 38 89 88.907 51 days b-
Strontium Sr 38 90 84.911 7 28 days b-
Sulphur S 16 32 31.927 072   95.0
Tantalum Ta 73 181 180.940 8    
Technetium Tc 43 99 98.906 * 6 hours g
Technetium Tc 43 101 100.9059    
Tellurium Te 52 122 121.903    
Terbium Tb 65 159 158.925 0    
Thallium Tl 81 205 204.974 46   70.5
Thorium Th 90 232 232.038 21 1.41x1010 years a
Thulium Tm 69 169 168.934    
Titanium Ti 22 48 47.947 95    
Tin Sn 50 120 119.902    
Tritium T 1 3 3.016 049 12.3 years b-
Tungsten W 74 184 183.951 0    
Uranium U 92 235 235.043 9 7.1x108 years a
Uranium U 92 238 238.050 7 4.5x109 years a
Vanadium V 23 51 50.943 98    
Xenon Xe 54 129 128.904 779   26.44
Xenon Xe 54 132 131.904 16   26.89
Xenon Xe 54 133 132.905 6 5.3 days b-
Ytterbium Yb 70 174 173.939 0    
Yttrium Y 39 89 88.905    
Zinc Zn 30 64 63.929 15   48.89
Zirconium Zr 40 90 89.904 3    


For a list of the elements in nucleon number order please see: Table of elements (nucleon number order)
 


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© Keith Gibbs 2016