03.00 2013-30-31 0 electron e -0.00054857990943(23) 1 hydrogen H 1.008 [1.00784; 1.00811] 1 protium (1)H 1.00782503207(10) 0.999885 2 deuterium (2)H 2.01410177785(36) 0.000115 3 tritium (3)H 3.01604927767(247) 0.000000 2 helium He 4.002602(2) 3 (3)He 3.01602931914(260) 0.000001 4 (4)He 4.00260325415(6) 0.999999 3 lithium Li 6.94 [6.938; 6.997] 6 (6)Li 6.015122794(16) 0.0759 7 (7)Li 7.016004548(84) 0.9241 4 berylium Be 9.012182(3) 7 (7)Be 7.016929828(113) 0.0000 8 (8)Be 8.005305103(37) 0.0000 9 (9)Be 9.012182201(426) 1.0000 5 boron B 10.81 [10.806; 10.821] 8 (8)B 8.024607233(1073) 0.000 10 (10)B 10.012936992(413) 0.199 11 (11)B 11.009305406(448) 0.801 6 carbon C 12.011 [12.0096; 12.0116] 11 (11)C 11.011433613(1020) 0.0000 12 (12)C 12. 0.9893 13 (13)C 13.00335483778(98) 0.0107 14 (14)C 14.00324198870(408) 0.0000 7 nitrogen N 14.007 [14.00643; 14.00728] 12 (12)N 12.018613197(1073) 0.00000 13 (13)N 13.005738609(289) 0.00000 14 (14)N 14.00307400478(62) 0.99636 15 (15)N 15.00010889823(75) 0.00364 8 oxygen O 15.999 [15.99903; 15.99977] 14 (14)O 14.008596250(116) 0.00000 15 (15)O 15.003065617(526) 0.00000 16 (16)O 15.99491461956(16) 0.99757 17 (17)O 16.999131703(118) 0.00038 18 (18)O 17.999161001(666) 0.00205 9 fluorine F 18.9984032(5) 17 (17)F 17.002095237(266) 0.0000 18 (18)F 18.000937956(573) 0.0000 19 (19)F 18.998403224(74) 1.0000 10 neon Ne 20.1797(6) 19 (19)Ne 19.001880248(307) 0.0000 20 (20)Ne 19.99244017542(192) 0.9048 21 (21)Ne 20.99384668(4) 0.0027 22 (22)Ne 21.991385113(18) 0.0925 11 sodium Na 22.98976928(2) 23 (23)Na 22.98976928087(293) 1.0000 12 magnesium Mg 24.305 [24.304; 24.307] 24 (24)Mg 23.985041699(13) 0.7899 25 (25)Mg 24.985836917(34) 0.1000 26 (26)Mg 25.982592929(29) 0.1101 13 aluminium Al 26.9815386(8) 27 (27)Al 26.981538627(124) 1.0000 14 silicon Si 28.085 [28.084; 28.086] 28 (28)Si 27.97692653246(194) 0.92223 29 (29)Si 28.976494700(22) 0.04685 30 (30)Si 29.973770171(32) 0.03092 15 phosphorus P 30.973762(2) 31 (31)P 30.973761629(196) 1.0000 16 sulfur S 32.06 [32.059; 32.076] 32 (32)S 31.972070999(148) 0.9499 33 (33)S 32.971458759(146) 0.0075 34 (34)S 33.967866902(115) 0.0425 36 (36)S 35.967080760(202) 0.0001 17 chlorine Cl 35.45 [35.446; 35.457] 35 (35)Cl 34.968852682(40) 0.7576 37 (37)Cl 36.965902591(50) 0.2424 18 argon Ar 39.948(1) 36 (36)Ar 35.967545105(28) 0.003365 38 (38)Ar 37.962732394(362) 0.000632 40 (40)Ar 39.96238312251(286) 0.996003 19 potassium K 39.0983(1) 39 (39)K 38.963706679(204) 0.932581 40 (40)K 39.963998475(206) 0.000117 41 (41)K 40.961825762(208) 0.067302 20 calcium Ca 40.078(4) 40 (40)Ca 39.962590983(224) 0.96941 42 (42)Ca 41.958618014(267) 0.00647 43 (43)Ca 42.958766628(323) 0.00135 44 (44)Ca 43.955481754(403) 0.02086 46 (46)Ca 45.953692587(2443) 0.00004 48 (48)Ca 47.952534177(4382) 0.00187 21 scandium Sc 44.955912(6) 45 (45)Sc 44.955911909(898) 1.0000 22 titanium Ti 47.867(1) 46 (46)Ti 45.952631555(894) 0.0825 47 (47)Ti 46.951763088(882) 0.0744 48 (48)Ti 47.947946281(882) 0.7372 49 (49)Ti 48.947869982(882) 0.0541 50 (50)Ti 49.944791194(883) 0.0518 23 vanadium V 50.9415(1) 50 (50)V 49.947158485(1078) 0.00250 51 (51)V 50.943959507(1075) 0.99750 24 chromium Cr 51.9961(6) 50 (50)Cr 49.946044205(1074) 0.04345 52 (52)Cr 51.940507472(835) 0.83789 53 (53)Cr 52.940649386(828) 0.09501 54 (54)Cr 53.938880395(821) 0.02365 25 manganese Mn 54.938045(5) 55 (55)Mn 54.938045141(729) 1.0000 26 iron Fe 55.845(2) 54 (54)Fe 53.939610501(740) 0.05845 56 (56)Fe 55.934937475(735) 0.91754 57 (57)Fe 56.935393969(736) 0.02119 58 (58)Fe 57.933275558(755) 0.00282 27 cobalt Co 58.933195(5) 59 (59)Co 58.933195048(669) 1.0000 28 nickel Ni 58.6934(4) 58 (58)Ni 57.935342907(653) 0.680769 60 (60)Ni 59.930786372(651) 0.262231 61 (61)Ni 60.931056033(651) 0.011399 62 (62)Ni 61.928345115(641) 0.036345 64 (64)Ni 63.927965959(654) 0.009256 29 copper Cu 63.546(3) 63 (63)Cu 62.929597474(641) 0.6915 65 (65)Cu 64.927789485(728) 0.3085 30 zinc Zn 65.38(2) 64 (64)Zn 63.929142222(733) 0.48268 66 (66)Zn 65.926033419(987) 0.27975 67 (67)Zn 66.927127345(1005) 0.04102 68 (68)Zn 67.924844154(1025) 0.19024 70 (70)Zn 69.925319274(2095) 0.00631 31 gallium Ga 69.723(1) 69 (69)Ga 68.925573587(1292) 0.60108 71 (71)Ga 70.924701349(1092) 0.39892 32 germanium Ge 72.630(8) 70 (70)Ge 69.924247381(1102) 0.2038 72 (72)Ge 71.922075815(1755) 0.2731 73 (73)Ge 72.923458945(1755) 0.0776 74 (74)Ge 73.921177767(1754) 0.3672 76 (76)Ge 75.921402557(1772) 0.0783 33 arsenic As 74.92160(2) 75 (75)As 74.921596478(1951) 1.0000 34 selenium Se 78.96(3) 74 (74)Se 73.922476436(1798) 0.0089 76 (76)Se 75.919213597(1772) 0.0937 77 (77)Se 76.919914038(1773) 0.0763 78 (78)Se 77.917309090(1776) 0.2377 80 (80)Se 79.916521271(2135) 0.4961 82 (82)Se 81.916699401(2168) 0.0873 35 bromine Br 79.904 [79.901; 79.907] 79 (79)Br 78.918337087(2165) 0.5069 81 (81)Br 80.916290563(2095) 0.4931 36 krypton Kr 83.798(2) 78 (78)Kr 77.920364783(1153) 0.00355 80 (80)Kr 79.916378965(1577) 0.02286 82 (82)Kr 81.913483600(1910) 0.11593 83 (83)Kr 82.914136099(3019) 0.11500 84 (84)Kr 83.911506687(3010) 0.56987 86 (86)Kr 85.910610729(110) 0.17279 37 rubidium Rb 85.4678(3) 85 (85)Rb 84.911789737(12) 0.7217 87 (87)Rb 86.909180526(12) 0.2783 38 strontium Sr 87.62(1) 84 (84)Sr 83.913425275(3437) 0.0056 86 (86)Sr 85.909260204(1152) 0.0986 87 (87)Sr 86.908877124(1152) 0.0700 88 (88)Sr 87.905612124(1163) 0.8258 39 yttrium Y 88.90585(2) 89 (89)Y 88.905848295(2739) 1.0000 40 zirconium Zr 91.224(2) 90 (90)Zr 89.904704416(2542) 0.5145 91 (91)Zr 90.905645767(2518) 0.1122 92 (92)Zr 91.905040847(2517) 0.1715 94 (94)Zr 93.906315192(2598) 0.1738 96 (96)Zr 95.908273386(2993) 0.0280 41 niobium Nb 92.90638(2) 93 (93)Nb 92.906378058(2607) 1.0000 42 molybdenum Mo 95.96(2) 92 (92)Mo 91.906810991(4083) 0.1477 94 (94)Mo 93.905088269(2058) 0.0923 95 (95)Mo 94.905842129(2057) 0.1590 96 (96)Mo 95.904679477(2057) 0.1668 97 (97)Mo 96.906021465(2053) 0.0956 98 (98)Mo 97.905408169(2054) 0.2419 100 (100)Mo 99.907477336(6285) 0.0967 43 technetium Tc [98] 44 ruthenium Ru 101.07(2) 96 (96)Ru 95.907597835(8461) 0.0554 98 (98)Ru 97.905287132(6732) 0.0187 99 (99)Ru 98.905939302(2158) 0.1276 100 (100)Ru 99.904219476(2158) 0.1260 101 (101)Ru 100.905582087(2161) 0.1706 102 (102)Ru 101.904349312(2162) 0.3155 104 (104)Ru 103.905432701(3367) 0.1862 45 rhodium Rh 102.90550(2) 103 (103)Rh 102.905504292(3012) 1.0000 46 palladium Pd 106.42(1) 102 (102)Pd 101.905608544(3207) 0.0102 104 (104)Pd 103.904035834(4436) 0.1114 105 (105)Pd 104.905084920(4372) 0.2233 106 (106)Pd 105.903485715(4372) 0.2733 108 (108)Pd 107.903891701(3695) 0.2646 110 (110)Pd 109.905153254(11672) 0.1172 47 silver Ag 107.8682(2) 107 (107)Ag 106.905096820(4584) 0.51839 109 (109)Ag 108.904752292(3113) 0.48161 48 cadmium Cd 112.411(8) 106 (106)Cd 105.906459410(6367) 0.0125 108 (108)Cd 107.904183683(5974) 0.0089 110 (110)Cd 109.903002070(2860) 0.1249 111 (111)Cd 110.904178107(2858) 0.1280 112 (112)Cd 111.902757809(2854) 0.2413 113 (113)Cd 112.904401662(2869) 0.1222 114 (114)Cd 113.903358540(2870) 0.2873 116 (116)Cd 115.904755809(3381) 0.0749 49 indium In 114.818(1) 113 (113)In 112.904057761(3448) 0.0429 115 (115)In 114.903878484(4791) 0.9571 50 tin Sn 118.710(7) 112 (112)Sn 111.904818207(4598) 0.0097 114 (114)Sn 113.902778869(3405) 0.0066 115 (115)Sn 114.903342397(3160) 0.0034 116 (116)Sn 115.901740530(3159) 0.1454 117 (117)Sn 116.902951656(3136) 0.0768 118 (118)Sn 117.901603167(3100) 0.2422 119 (119)Sn 118.903307630(3083) 0.0859 120 (120)Sn 119.902194676(2687) 0.3258 122 (122)Sn 121.903439046(2915) 0.0463 124 (124)Sn 123.905273946(1496) 0.0579 51 antimony Sb 121.760(1) 121 (121)Sb 120.903815686(2359) 0.5721 123 (123)Sb 122.904213970(2223) 0.4279 52 tellurium Te 127.60(3) 120 (120)Te 119.904020222(1409) 0.0009 122 (122)Te 121.903043898(1599) 0.0255 123 (123)Te 122.904270029(1592) 0.0089 124 (124)Te 123.902817896(1583) 0.0474 125 (125)Te 124.904430731(1583) 0.0707 126 (126)Te 125.903311696(1585) 0.1884 128 (128)Te 127.904463056(1878) 0.3174 130 (130)Te 129.906224399(2067) 0.3408 53 iodine I 126.90447(3) 127 (127)I 126.904472681(3791) 1.0000 54 xenon Xe 131.293(6) 124 (124)Xe 123.905893003(1961) 0.000952 126 (126)Xe 125.904273634(6705) 0.000890 128 (128)Xe 127.903531275(1532) 0.019102 129 (129)Xe 128.904779435(793) 0.264006 130 (130)Xe 129.903508007(805) 0.040710 131 (131)Xe 130.905082362(1030) 0.212324 132 (132)Xe 131.904153457(1043) 0.269086 134 (134)Xe 133.905394464(901) 0.104357 136 (136)Xe 135.907218794(7558) 0.088573 55 caesium Cs 132.9054519(2) 133 (133)Cs 132.905451932(23) 1.0000 56 barium Ba 137.327(7) 130 (130)Ba 129.906320811(2995) 0.00106 132 (132)Ba 131.905061288(1134) 0.00101 134 (134)Ba 133.904508383(428) 0.02417 135 (135)Ba 134.905688591(442) 0.06592 136 (136)Ba 135.904575945(444) 0.07854 137 (137)Ba 136.905827384(451) 0.11232 138 (138)Ba 137.905247237(453) 0.71698 57 lanthanum La 138.90547(7) 138 (138)La 137.907111930(3787) 0.00090 139 (139)La 138.906353267(2592) 0.99910 58 cerium Ce 140.116(1) 136 (136)Ce 135.907172422(14286) 0.00185 138 (138)Ce 137.905991321(1902) 0.00251 140 (140)Ce 139.905438706(2642) 0.88450 142 (142)Ce 141.909244205(3213) 0.11114 59 praseodymium Pr 140.90765(2) 141 (141)Pr 140.907652769(2649) 1.0000 60 neodymium Nd 144.242(3) 142 (142)Nd 141.907723297(2498) 0.272 143 (143)Nd 142.909814290(2498) 0.122 144 (144)Nd 143.910087274(2498) 0.238 145 (145)Nd 144.912573636(2505) 0.083 146 (146)Nd 145.913116939(2505) 0.172 148 (148)Nd 147.916893288(3045) 0.057 150 (150)Nd 149.920890888(3418) 0.056 61 promethium Pm [145] 62 samarium Sm 150.36(2) 144 (144)Sm 143.911999478(3013) 0.0307 147 (147)Sm 146.914897923(2589) 0.1499 148 (148)Sm 147.914822674(2594) 0.1124 149 (149)Sm 148.917184735(2622) 0.1382 150 (150)Sm 149.917275539(2611) 0.0738 152 (152)Sm 151.919732425(2652) 0.2675 154 (154)Sm 153.922209273(2735) 0.2275 63 europium Eu 151.964(1) 151 (151)Eu 150.919850161(2635) 0.4781 153 (153)Eu 152.921230339(2637) 0.5219 64 gadolinium Gd 157.25(3) 152 (152)Gd 151.919790996(2697) 0.0020 154 (154)Gd 153.920865598(2688) 0.0218 155 (155)Gd 154.922622022(2688) 0.1480 156 (156)Gd 155.922122743(2688) 0.2047 157 (157)Gd 156.923960135(2689) 0.1565 158 (158)Gd 157.924103912(2689) 0.2484 160 (160)Gd 159.927054146(2744) 0.2186 65 terbium Tb 158.92535(2) 159 (159)Tb 158.925346757(2739) 1.0000 66 dysprosium Dy 162.500(1) 156 (156)Dy 155.924283110(7073) 0.00056 158 (158)Dy 157.924409487(3647) 0.00095 160 (160)Dy 159.925197517(2721) 0.02329 161 (161)Dy 160.926933364(2721) 0.18889 162 (162)Dy 161.926798447(2721) 0.25475 163 (163)Dy 162.928731159(2720) 0.24896 164 (164)Dy 163.929174751(2720) 0.28260 67 holmium Ho 164.93032(2) 165 (165)Ho 164.930322070(2710) 1.0000 68 erbium Er 167.259(3) 162 (162)Er 161.928778264(3721) 0.00139 164 (164)Er 163.929200229(3295) 0.01601 166 (166)Er 165.930293061(2698) 0.33503 167 (167)Er 166.932048159(2696) 0.22869 168 (168)Er 167.932370224(2697) 0.26978 170 (170)Er 169.935464312(2957) 0.14910 69 thulium Tm 168.93421(2) 169 (169)Tm 168.934213250(2658) 1.0000 70 ytterbium Yb 173.054(5) 168 (168)Yb 167.933896895(4713) 0.0013 170 (170)Yb 169.934761837(2628) 0.0304 171 (171)Yb 170.936325799(2576) 0.1428 172 (172)Yb 171.936381469(2574) 0.2183 173 (173)Yb 172.938210787(2563) 0.1613 174 (174)Yb 173.938862089(2563) 0.3183 176 (176)Yb 175.942571683(2760) 0.1276 71 lutetium Lu 174.9668(1) 175 (175)Lu 174.940771819(2347) 0.9741 176 (176)Lu 175.942686310(2344) 0.0259 72 hafnium Hf 178.49(2) 174 (174)Hf 173.940046178(3012) 0.0016 176 (176)Hf 175.941408631(2379) 0.0526 177 (177)Hf 176.943220651(2304) 0.1860 178 (178)Hf 177.943698766(2301) 0.2728 179 (179)Hf 178.945816145(2301) 0.1362 180 (180)Hf 179.946549953(2304) 0.3508 73 tantalum Ta 180.94788(2) 180 (180)Ta 179.947464831(2379) 0.00012 181 (181)Ta 180.947995763(1924) 0.99988 74 tungsten W 183.84(1) 180 (180)W 179.946704459(4219) 0.0012 182 (182)W 181.948204156(889) 0.2650 183 (183)W 182.950222951(884) 0.1431 184 (184)W 183.950931188(922) 0.3064 186 (186)W 185.954364127(1877) 0.2843 75 rhenium Re 186.207(1) 185 (185)Re 184.952954982(1280) 0.3740 187 (187)Re 186.955753109(1513) 0.6260 76 osmium Os 190.23(3) 184 (184)Os 183.952489071(1399) 0.0002 186 (186)Os 185.953838158(1481) 0.0159 187 (187)Os 186.955750458(1513) 0.0196 188 (188)Os 187.955838228(1518) 0.1324 189 (189)Os 188.958147470(1572) 0.1615 190 (190)Os 189.958447048(1580) 0.2626 192 (192)Os 191.961480690(2743) 0.4078 77 iridium Ir 192.217(3) 191 (191)Ir 190.960594046(1790) 0.373 193 (193)Ir 192.962926430(1795) 0.627 78 platinum Pt 195.084(9) 190 (190)Pt 189.959931655(6124) 0.00014 192 (192)Pt 191.961038005(2651) 0.00782 194 (194)Pt 193.962680253(948) 0.32967 195 (195)Pt 194.964791134(940) 0.33832 196 (196)Pt 195.964951521(931) 0.25242 198 (198)Pt 197.967892790(3341) 0.07163 79 gold Au 196.966569(4) 197 (197)Au 196.966568662(646) 1.0000 80 mercury Hg 200.592(3) 196 (196)Hg 195.965832649(3158) 0.0015 198 (198)Hg 197.966769032(362) 0.0997 199 (199)Hg 198.968279932(392) 0.1687 200 (200)Hg 199.968326004(406) 0.2310 201 (201)Hg 200.970302268(638) 0.1318 202 (202)Hg 201.970643011(634) 0.2986 204 (204)Hg 203.973493933(364) 0.0687 81 thallium Tl 204.38 [204.382; 204.385] 203 (203)Tl 202.972344220(1365) 0.2952 205 (205)Tl 204.974427541(1422) 0.7048 82 lead Pb 207.2(1) 204 (204)Pb 203.973043589(1335) 0.014 206 (206)Pb 205.974465278(1331) 0.241 207 (207)Pb 206.975896887(1334) 0.221 208 (208)Pb 207.976652071(1335) 0.524 83 bismuth Bi 208.98040(1) 209 (209)Bi 208.980398734(1554) 1.0000 84 polonium Po [209] 85 astatine At [210] 86 radon Rn [222] 87 francium Fr [223] 88 radium Ra [226] 89 actinium Ac [227] 90 thorium Th 232.03806(2) 232 (232)Th 232.038055325(2137) 1.0000 91 protactinium Pa 231.03588(2) 231 (231)Pa 231.035883990(2422) 1.0000 92 uranium U 238.02891(3) 234 (234)U 234.040952088(1960) 0.000054 235 (235)U 235.043929918(1957) 0.007204 238 (238)U 238.050788247(2044) 0.992742 93 neptunium Np [237] 94 plutonium Pu [244] 95 americium Am [243] 96 curium Cm [247] 97 berkelium Bk [247] 98 californium Cf [251] 99 einsteinium Es [252] 100 fermium Fm [257] 101 mendelevium Md [258] 102 nobelium No [259] 103 lawrencium Lr [262] 104 rutherfordium Rf [267] 105 dubnium Db [268] 106 seaborgium Sg [271] 107 bohrium Bh [272] 108 hassium Hs [270] 109 meitnerium Mt [276] 110 darmstadtium Ds [281] 111 roentgenium Rg [280] 112 copernicium Cn [285] 113 ununtrium Uut [284] 114 ununquadium Uuq [289] 115 ununpentium Uup [288] 116 ununhexium Uuh [293] 118 ununoctium Uuo [294]