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IUPAC of the

Element Background Color Key element name (number of + Standard atomic weights are the best estimates by IUPAC of atomic weights that are found in normal materials, which are terrestrial 106 108 ) element symbol 111166 ., black indicates materials that are reasonably possible sources for elements and their compounds in commerce, industry, or science. They are 111133 114 isotope is stable Cd , determined using all stable isotopes and selected radioactive isotopes (having relatively long half-lives and characteristic terrestrial . red indicates isotopic compositions). Isotopes are considered stable (non-radioactive) if evidence for has not been detected (number of protons) 48 110 isotope is radioactive experimentally. 111 isotopic abundance 1 standard 112 (mole fraction 18 Element has two or more isotopes that are used to determine its . The isotopic abundances and atomic weight 112.414(4) of isotope)

atomic weights vary in normal materials. These variations are well known, and the standard atomic weight is given as lower { and upper bounds within square brackets, [ ]. uncertainty in last digit (112.414 ± 0.004) H 2 He 3 1 2 Element has two or more isotopes that are used to determine its standard atomic weight. The isotopic abundances and 1 atomic weights vary in normal materials, but upper and lower bounds of the standard atomic weight have not been assigned 4 [1.007 84, 1.008 11] 2 by IUPAC or the variations may be too small to affect the standard atomic weight value significantly. Thus, the standard 13 14 15 16 17 4.002 602(2) lithium atomic weight is given as a single value with an uncertainty that includes both measurement uncertainty and uncertainty due to isotopic abundance variations. 21 9 17 19 22 Li 6 Be B 10 C 13 N 15 O 18 F Ne 10 3 4 Element has only one isotope that is used to determine its standard atomic weight. Thus, the standard atomic weight is 5 6 7 8 9

7 invariant and is given as a single value with an IUPAC evaluated uncertainty. 11 12 14 16 20 [6.938, 6.997] 9.012 1831(5) [10.806, 10.821] [12.0096, 12.0116] [14.006 43, 14.007 28] [15.999 03, 15.999 77] 18.998 403 163(6) 20.1797(6) Element has no standard atomic weight because all of its isotopes are radioactive and, in normal materials, no isotope sodium phosphorus 33 36 occurs with a characteristic isotopic abundance from which a standard atomic weight can be determined. 36 (aluminum) 34 38 23 26 27 29 31 Na Mg 25 Si 30 P S Cl 37 Ar 11 12 Al 14 15 16 17 18 13 35 24 28 32 40 22.989 769 28(2) [24.304, 24.307] 3 4 5 6 7 8 9 10 11 12 26.981 5385(7) [28.084, 28.086] 30.973 761 998(5) [32.059, 32.076] [35.446, 35.457] 39.948(1) potassium iron cobalt zinc gallium arsenic 48 42 61 70 74 78 40 44 43 57 64 46 47 53 54 58 62 67 76 82 77 80 41 46 45 49 50 55 59 60 68 70 75 83 K Ca Sc Ti 50 V 50 Cr 54 Mn Fe Co Ni Cu 65 Zn Ga 71 Ge 73 As Se76 Br 81 Kr 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 82 78 66 72 86 40 48 51 52 56 58 63 64 69 74 80 79 39 84 39.0983(1) 40.078(4) 44.955 908(5) 47.867(1) 50.9415(1) 51.9961(6) 54.938 044(3) 55.845(2) 58.933 194(4) 58.6934(4) 63.546(3) 65.38(2) 69.723(1) 72.630(8) 74.921 595(6) 78.971(8) [79.901, 79.907] 83.798(2)

rubidium ruthenium rhodium palladium cadmium indium antimony xenon 124 106 108 114 122 123 84 102 112 130 128 126 94 100 109 116 113 122 115 123 124 120 86 87 92 91 97 96 113 89 93 99 98 103 104 114 124 125 127 136 87 96 98 Pd 106 Sn 120 Te 130 I Xe 132 Rb Sr Y Zr Nb Mo100 Tc Ru Rh Ag Cd In Sb 110 117 126 134 37 38 39 40 41 42 43 44 45 46 47 48 110 49 50 51 52 53 54 94 119 92 101 131 105 111 85 88 90 102 116 95 96 104 107 112 115 128 108 118 121 129 85.4678(3) 87.62(1) 88.905 84(2) 91.224(2) 92.906 37(2) 95.95(1) 101.07(2) 102.905 50(2) 106.42(1) 107.8682(2) 112.414(4) 114.818(1) 118.710(7) 121.760(1) 127.60(3) 126.904 47(3) 131.293(6) 134 iridium 130 57 - 71 174 180 186 184 (cesium) 135 132 187 192 190 196 133 176 183 197 204 207 204 209 136 179 180 180 185 188 I 191 198 198 203 Ba Hf Ta W 184 Re Os 192 r 195 Au Hg 202 Tl Pb Bi Po At Rn 137 Pt 196 56 lanthanoids 72 73 74 75 76 189 77 79 80 201 81 82 83 84 85 86 Cs 182 177 78 206 55 181 187 193 199 205 208 194 138 178 186 190 200 132.905 451 96(6) 137.327(7) 178.49(2) 180.947 88(2) 183.84(1) 186.207(1) 190.23(3) 192.217(3) 195.084(9) 196.966 569(5) 200.592(3) [204.382, 204.385] 208.980 40(1) 89 - 103 ununtrium ununpentium ununseptium ununoctium Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Uut Fl Uup Lv Uus Uuo 87 88 actinoids 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118

cerium praseodymium neodymium promethium samarium gadolinium dysprosium holmium thulium 136 138 158 156 162 168 144 154 152 164 160 170 142 141 148 150 150 159 165 169 142 151 155 158 161 164 170 166 176 174 176 La 138 Ce Pr Nd145 Pm Sm148 152 Eu Gd Tb Dy Ho Er Tm Yb Lu 57 58 59 60 61 62 63 64 65 66 67 68 69 70 171 71 143 157 149 167 163 139 153 160 173 175 146 144 154 156 140 147 162 168 172 138.905 47(7) 140.116(1) 140.907 66(2) 144.242(3) 150.36(2) 151.964(1) 157.25(3) 158.925 35(2) 162.500(1) 164.930 33(2) 167.259(3) 168.934 22(2) 173.054(5) 174.9668(1) 234 235 231 Ac Th 230 Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103

232 238 232.0377(4) 231.035 88(2) 238.028 91(3)

International Union of Pure and Applied Chemistry (IUPAC) Project 2007-038-3-200, "Development of an isotopic periodic table for the educational community" October 1, 2013 www.ciaaw.org