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相对原子质量表

原子序 元素 符号 標準原子质量 不確定度 單同位素質量
1 H 1.0080 ±0.0002
2 He 4.0026 ±0.0001
3 Li 6.94 ±0.06
4 Be 9.0122 ±0.0001 9.0121 831±0.0000 005
5 B 10.81 ±0.02
6 C 12.011 ±0.002
7 N 14.007 ±0.001
8 O 15.999 ±0.001
9 F 18.998 ±0.001
10 Ne 20.180 ±0.001
11 Na 22.990 ±0.001
12 Mg 24.305 ±0.002
13 Al 26.982 ±0.001
14 Si 28.0855 ±0.001
15 P 30.974 ±0.001
16 S 32.06 ±0.02
17 Cl 35.45 ±0.01
18 Ar 39.95 ±0.16
19 K 39.098 ±0.001
20 Ca 40.078 ±0.004
21 Sc 44.956 ±0.0001
22 Ti 47.867 ±0.001
23 V 50.942 ±0.001
24 Cr 51.996 ±0.001
25 Mn 54.938 ±0.001
26 Fe 55.845 ±0.002
27 Co 58.933 ±0.001
28 Ni 58.693 ±0.001
29 Cu 63.546 ±0.003
30 Zn 65.38 ±0.02
31 Ga 69.723 ±0.001
32 Ge 72.630 ±0.008
33 As 74.922 ±0.001
34 Se 78.971 ±0.008
35 Br 79.904 ±0.003
36 Kr 83.798 ±0.002
37 Rb 85.468 ±0.001
38 Sr 87.62 ±0.01
39 Y 88.906 ±0.001
40 Zr 91.224 ±0.002
41 Nb 92.906 ±0.001
42 Mo 95.95 ±0.01
43 Tc [97]
44 Ru 101.07 ±0.02
45 Rh 102.91 ±0.01
46 Pd 106.42 ±0.01
47 Ag 107.87 ±0.01
48 Cd 112.41 ±0.01
49 In 114.82 ±0.01
50 Sn 118.71 ±0.01
51 Sb 121.76 ±0.01
52 Te 127.60 ±0.03
53 I 126.90 ±0.01
54 Xe 131.29 ±0.01
55 Cs 132.91 ±0.01
56 Ba 137.33 ±0.01
57 La 138.91 ±0.01
58 Ce 140.12 ±0.01
59 Pr 140.91 ±0.01
60 Nd 144.24 ±0.01
61 Pm [145]
62 Sm 150.36 ±0.02
63 Eu 151.96 ±0.01
64 Gd 157.25 ±0.03
65 Tb 158.93 ±0.01 Tb159,穩定,158.925 354±0.000 007
66 Dy 162.50 ±0.01
67 Ho 164.93 ±0.01
68 Er 167.26 ±0.01
69 Tm 168.93 ±0.01
70 Yb 173.05 ±0.02
71 Lu 174.97 ±0.01
72 Hf 178.49 ±0.01
73 Ta 180.95 ±0.01
74 W 183.84 ±0.01
75 Re 186.21 ±0.01
76 Os 190.23 ±0.03
77 Ir 192.22 ±0.01
78 Pt 195.08 ±0.02
79 Au 196.97 ±0.01
80 Hg 200.59 ±0.01
81 Tl 204.38 ±0.01
82 Pb 207.2 ±1.1
83 Bi 208.98 ±0.01
84 Po [209]
85 At [210]
86 Rn [222]
87 Fr [223]
88 Ra [226]
89 Ac [227]
90 Th 232.04 ±0.01
91 Pa 231.04 ±0.01
92 U 238.03 ±0.01
93 Np [237]
94 Pu [244]
95 Am [243]
96 Cm [247]
97 Bk [247]
98 Cf [251]
99 Es [252]
100 Fm [257]
101 Md [258]
102 No [259]
103 Lr [262]
104 Rf [267]
105 𨧀 Db [268]
106 𨭎 Sg [269]
107 𨨏 Bh [270]
108 𨭆 Hs [269]
109 Mt [277]
110 Ds [281]
111 Rg [282]
112 Cn [285]
113 Nh [286]
114 Fl [290]
115 Mc [290]
116 Lv [293]
117 Ts [294]
118 Og [294]
元素 符号 原子序 標準原子質量 通用標準原子質量 單同位素
不確定度b ±
hydrogen H 1 [1.007 84,1.008 11] m 1.0080 0.0002
helium He 2 4.002 602 0.000 002 g r 4.0026 0.0001
lithium Li 3 [6.938,6.997] m 6.94 0.06
beryllium Be 4 9.012 1831 0.000 0005 9.0122 0.0001
boron B 5 [10.806,10.821] m 10.81 0.02
carbon C 6 [12.0096,12.0116] 12.011 0.002
nitrogen N 7 [14.006 43,14.007 28] m 14.007 0.001
oxygen O 8 [15.999 03,15.999 77] m 15.999 0.001
fluorine F 9 18.998 403 162 0.000 000 005 18.998 0.001
neon Ne 10 20.1797 0.0006 g m 20.180 0.001
sodium Na 11 22.989 769 28 0.000 000 02 22.990 0.001
magnesium Mg 12 [24.304,24.307] 24.305 0.002
aluminium Al 13 26.981 5384 0.000 0003 26.982 0.001
silicon Si 14 [28.084,28.086] 28.085 0.001
phosphorus P 15 30.973 761 998 0.000 000 005 30.974 0.001
sulfur S 16 [32.059,32.076] 32.06 0.02
chlorine Cl 17 [35.446,35.457] m 35.45 0.01
argon Ar 18 [39.792,39.963] 39.95 0.16
potassium K 19 39.0983 0.0001 39.098 0.001
calcium Ca 20 40.078 0.004 g 40.078 0.004
scandium Sc 21 44.955 907 0.000 004 44.956 0.001
titanium Ti 22 47.867 0.001 47.867 0.001
vanadium V 23 50.9415 0.0001 50.942 0.001
chromium Cr 24 51.9961 0.0006 51.996 0.001
manganese Mn 25 54.938 043 0.000 002 54.938 0.001
iron Fe 26 55.845 0.002 55.845 0.002
cobalt Co 27 58.933 194 0.000 003 58.933 0.001
nickel Ni 28 58.6934 0.0004 r 58.693 0.001
copper Cu 29 63.546 0.003 r 63.546 0.003
zinc Zn 30 65.38 0.02 r 65.38 0.02
gallium Ga 31 69.723 0.001 69.723 0.001
germanium Ge 32 72.630 0.008 72.630 0.008
arsenic As 33 74.921 595 0.000 006 74.922 0.001
selenium Se 34 78.971 0.008 r 78.971 0.008
bromine Br 35 [79.901,79.907] 79.904 0.003
krypton Kr 36 83.798 0.002 g m 83.798 0.002
rubidium Rb 37 85.4678 0.0003 g 85.468 0.001
strontium Sr 38 87.62 0.01 g r 87.62 0.01
yttrium Y 39 88.905 838 0.000 002 88.906 0.001
zirconium Zr 40 91.224 0.002 g 91.224 0.002
niobium Nb 41 92.906 37 0.000 01 92.906 0.001
molybdenum Mo 42 95.95 0.01 g 95.95 0.01
technetiuma Tc 43
ruthenium Ru 44 101.07 0.02 g 101.07 0.02
rhodium Rh 45 102.905 49 0.000 02 102.91 0.01
palladium Pd 46 106.42 0.01 g 106.42 0.01
silver Ag 47 107.8682 0.0002 g 107.87 0.01
cadmium Cd 48 112.414 0.004 g 112.41 0.01
indium In 49 114.818 0.001 114.82 0.01
tin Sn 50 118.710 0.007 g 118.71 0.01
antimony Sb 51 121.760 0.001 g 121.76 0.01
tellurium Te 52 127.60 0.03 g 127.60 0.03
iodine I 53 126.904 47 0.000 03 126.90 0.01
xenon Xe 54 131.293 0.006 g m 131.29 0.01
caesium Cs 55 132.905 451 96 0.000 000 06 132.91 0.01
barium Ba 56 137.327 0.007 137.33 0.01
lanthanum La 57 138.905 47 0.000 07 g 138.91 0.01
cerium Ce 58 140.116 0.001 g 140.12 0.01
praseodymium Pr 59 140.907 66 0.000 01 140.91 0.01
neodymium Nd 60 144.242 0.003 g 144.24 0.01
promethiuma Pm 61
samarium Sm 62 150.36 0.02 g 150.36 0.02
europium Eu 63 151.964 0.001 g 151.96 0.01
gadolinium Gd 64 157.25 0.03 g 157.25 0.03
terbium Tb 65 158.925 354 0.000 007 158.93 0.01
dysprosium Dy 66 162.500 0.001 g 162.50 0.01
holmium Ho 67 164.930 329 0.000 005 164.93 0.01
erbium Er 68 167.259 0.003 g 167.26 0.01
thulium Tm 69 168.934 219 0.000 005 168.93 0.01
ytterbium Yb 70 173.045 0.010 g 173.05 0.02
lutetium Lu 71 174.9668 0.0001 g 174.97 0.01
hafnium Hf 72 178.486 0.006 g 178.49 0.01
tantalum Ta 73 180.947 88 0.000 02 180.95 0.01
tungsten W 74 183.84 0.01 183.84 0.01
rhenium Re 75 186.207 0.001 186.21 0.01
osmium Os 76 190.23 0.03 g 190.23 0.03
iridium Ir 77 192.217 0.002 192.22 0.01
platinum Pt 78 195.084 0.009 195.08 0.02
gold Au 79 196.966 570 0.000 004 196.97 0.01
mercury Hg 80 200.592 0.003 200.59 0.01
thallium Tl 81 [204.382,204.385] 204.38 0.01
lead Pb 82 [206.14,207.94] 207.2 1.1
bismutha Bi 83 208.980 40 0.000 01 208.98 0.01
poloniuma Po 84
astatinea At 85
radona Rn 86
franciuma Fr 87
radiuma Ra 88
actiniuma Ac 89
thoriuma Th 90 232.0377 0.0004 g 232.04 0.01
protactiniuma Pa 91 231.035 88 0.000 01 231.04 0.01
uraniuma U 92 238.028 91 0.000 03 g m 238.03 0.01
neptuniuma Np 93
plutoniuma Pu 94
americiuma Am 95
curiuma Cm 96
berkeliuma Bk 97
californiuma Cf 98
einsteiniuma Es 99
fermiuma Fm 100
mendeleviuma Md 101
nobeliuma No 102
lawrenciuma Lr 103
rutherfordiuma Rf 104
dubniuma Db 105
seaborgiuma Sg 106
bohriuma Bh 107
hassiuma Hs 108
meitneriuma Mt 109
darmstadtiuma Ds 110
roentgeniuma Rg 111
coperniciuma Cn 112
nihoniuma Nh 113
fleroviuma Fl 114
moscoviuma Mc 115
livermoriuma Lv 116
tennessinea Ts 117
oganessona Og 118

a此元素無穩定同位素,只有放射同位素。四種元素(Bi,Th,Pa,U)有characteristic terrestrial isotopic composition,其標準原子質量is tabulated;其它三十四種元素的標準原子質量cannot determine。

b Ar°(E) values and their uncertainties are given for normal materials and include evaluations of measurement uncertainty as well as natural variations in atomic weight where applicable。The atomic weight of a normal material is expected to lie within the lower and upper endpoints of the standard atomic weight at the current status of knowledge。If the uncertainty in Ar°(E) is considered too large for a user’s purpose for an element with measurable variations in atomic weight,a value of Ar(E) with a lower uncertainty might be obtained by measurement of an individual specimen.

g Geological and biological materials are known in which the element has an isotopic composition outside the limits for normal material。The difference between the atomic weight of the element in such materials and that given in the table may exceed the stated uncertainty.

m Modified isotopic compositions may be found in commercially available material because the material has been subjected to some undisclosed or inadvertent isotopic fractionation。Substantial deviations in atomic weight of the element from that given in the table can occur.

r Range in isotopic composition of normal terrestrial material prevents a more precise standard atomic weight being given;the tabulated value and uncertainty should be applicable to normal material.

参见 编辑

相对原子质量表, 注意, 本页有unihan新版汉字, 𨧀, 𨭎, 𨨏, 𨭆, 𫟼, 𫓧, 𫟷, 𬬭, 𬬻, 𬭊, 𬭛, 𬭳, 𬭶, 這些字符可能會错误显示, 詳见unicode扩展汉字, 本按原子序数排, 本表数据源自2022年iupac元素周期表, iupac, 2022, standard, atomic, weights, 页面存档备份, 存于互联网档案馆, 單同位素質量源自standard, atomic, weights, elements, 2021, iupac, technical, report. 注意 本页有Unihan新版汉字 䤭 䥑 鿏 鿔 鿫 鿬 鿭 𨧀 𨭎 𨨏 𨭆 𫟼 𫓧 𫟷 𬬭 𬬻 𬭊 𬭛 𬭳 𬭶 這些字符可能會错误显示 詳见Unicode扩展汉字 本相对原子质量表按原子序数排 本表数据源自2022年IUPAC元素周期表 IUPAC 2022 standard atomic weights 页面存档备份 存于互联网档案馆 單同位素質量源自Standard atomic weights of the elements 2021 IUPAC Technical Report 页面存档备份 存于互联网档案馆 以碳十二 12为标准 本表 内的原子质量为放射元素 除钨 铋 钍 镤 铀 虽然这些元素没有稳定同位素 但有天然放射同位素鎢180 182至184 186 鉍209 釷232 鏷231 鈾235 238 故仍可給予标準原子量 最长半衰期的同位素质量数 原子序 元素名 符号 標準原子质量 不確定度 單同位素質量1 氢 H 1 0080 0 00022 氦 He 4 0026 0 00013 锂 Li 6 94 0 064 铍 Be 9 0122 0 0001 9 0121 831 0 0000 0055 硼 B 10 81 0 026 碳 C 12 011 0 0027 氮 N 14 007 0 0018 氧 O 15 999 0 0019 氟 F 18 998 0 00110 氖 Ne 20 180 0 00111 钠 Na 22 990 0 00112 镁 Mg 24 305 0 00213 铝 Al 26 982 0 00114 硅 Si 28 0855 0 00115 磷 P 30 974 0 00116 硫 S 32 06 0 0217 氯 Cl 35 45 0 0118 氩 Ar 39 95 0 1619 钾 K 39 098 0 00120 钙 Ca 40 078 0 00421 钪 Sc 44 956 0 000122 钛 Ti 47 867 0 00123 钒 V 50 942 0 00124 铬 Cr 51 996 0 00125 锰 Mn 54 938 0 00126 铁 Fe 55 845 0 00227 钴 Co 58 933 0 00128 镍 Ni 58 693 0 00129 铜 Cu 63 546 0 00330 锌 Zn 65 38 0 0231 镓 Ga 69 723 0 00132 锗 Ge 72 630 0 00833 砷 As 74 922 0 00134 硒 Se 78 971 0 00835 溴 Br 79 904 0 00336 氪 Kr 83 798 0 00237 铷 Rb 85 468 0 00138 锶 Sr 87 62 0 0139 钇 Y 88 906 0 00140 锆 Zr 91 224 0 00241 铌 Nb 92 906 0 00142 钼 Mo 95 95 0 0143 锝 Tc 97 44 钌 Ru 101 07 0 0245 铑 Rh 102 91 0 0146 钯 Pd 106 42 0 0147 银 Ag 107 87 0 0148 镉 Cd 112 41 0 0149 铟 In 114 82 0 0150 锡 Sn 118 71 0 0151 锑 Sb 121 76 0 0152 碲 Te 127 60 0 0353 碘 I 126 90 0 0154 氙 Xe 131 29 0 0155 铯 Cs 132 91 0 0156 钡 Ba 137 33 0 0157 镧 La 138 91 0 0158 铈 Ce 140 12 0 0159 镨 Pr 140 91 0 0160 钕 Nd 144 24 0 0161 钷 Pm 145 62 钐 Sm 150 36 0 0263 铕 Eu 151 96 0 0164 钆 Gd 157 25 0 0365 铽 Tb 158 93 0 01 Tb159 穩定 158 925 354 0 000 00766 镝 Dy 162 50 0 0167 钬 Ho 164 93 0 0168 铒 Er 167 26 0 0169 铥 Tm 168 93 0 0170 镱 Yb 173 05 0 0271 镥 Lu 174 97 0 0172 铪 Hf 178 49 0 0173 钽 Ta 180 95 0 0174 钨 W 183 84 0 0175 铼 Re 186 21 0 0176 锇 Os 190 23 0 0377 铱 Ir 192 22 0 0178 铂 Pt 195 08 0 0279 金 Au 196 97 0 0180 汞 Hg 200 59 0 0181 铊 Tl 204 38 0 0182 铅 Pb 207 2 1 183 铋 Bi 208 98 0 0184 钋 Po 209 85 砹 At 210 86 氡 Rn 222 87 钫 Fr 223 88 镭 Ra 226 89 锕 Ac 227 90 钍 Th 232 04 0 0191 镤 Pa 231 04 0 0192 铀 U 238 03 0 0193 镎 Np 237 94 钚 Pu 244 95 镅 Am 243 96 锔 Cm 247 97 锫 Bk 247 98 锎 Cf 251 99 锿 Es 252 100 镄 Fm 257 101 钔 Md 258 102 锘 No 259 103 铹 Lr 262 104 鑪 Rf 267 105 𨧀 Db 268 106 𨭎 Sg 269 107 𨨏 Bh 270 108 𨭆 Hs 269 109 䥑 Mt 277 110 鐽 Ds 281 111 錀 Rg 282 112 鎶 Cn 285 113 鉨 Nh 286 114 鈇 Fl 290 115 镆 Mc 290 116 鉝 Lv 293 117 鿬 Ts 294 118 鿫 Og 294 元素名 符号 原子序 標準原子質量 註 通用標準原子質量 單同位素 值 不確定度b 值 hydrogen H 1 1 007 84 1 008 11 m 1 0080 0 0002helium He 2 4 002 602 0 000 002 g r 4 0026 0 0001lithium Li 3 6 938 6 997 m 6 94 0 06beryllium Be 4 9 012 1831 0 000 0005 9 0122 0 0001 是boron B 5 10 806 10 821 m 10 81 0 02carbon C 6 12 0096 12 0116 12 011 0 002nitrogen N 7 14 006 43 14 007 28 m 14 007 0 001oxygen O 8 15 999 03 15 999 77 m 15 999 0 001fluorine F 9 18 998 403 162 0 000 000 005 18 998 0 001 是neon Ne 10 20 1797 0 0006 g m 20 180 0 001sodium Na 11 22 989 769 28 0 000 000 02 22 990 0 001 是magnesium Mg 12 24 304 24 307 24 305 0 002aluminium Al 13 26 981 5384 0 000 0003 26 982 0 001 是silicon Si 14 28 084 28 086 28 085 0 001phosphorus P 15 30 973 761 998 0 000 000 005 30 974 0 001 是sulfur S 16 32 059 32 076 32 06 0 02chlorine Cl 17 35 446 35 457 m 35 45 0 01argon Ar 18 39 792 39 963 39 95 0 16potassium K 19 39 0983 0 0001 39 098 0 001calcium Ca 20 40 078 0 004 g 40 078 0 004scandium Sc 21 44 955 907 0 000 004 44 956 0 001 是titanium Ti 22 47 867 0 001 47 867 0 001vanadium V 23 50 9415 0 0001 50 942 0 001chromium Cr 24 51 9961 0 0006 51 996 0 001manganese Mn 25 54 938 043 0 000 002 54 938 0 001 是iron Fe 26 55 845 0 002 55 845 0 002cobalt Co 27 58 933 194 0 000 003 58 933 0 001 是nickel Ni 28 58 6934 0 0004 r 58 693 0 001copper Cu 29 63 546 0 003 r 63 546 0 003zinc Zn 30 65 38 0 02 r 65 38 0 02gallium Ga 31 69 723 0 001 69 723 0 001germanium Ge 32 72 630 0 008 72 630 0 008arsenic As 33 74 921 595 0 000 006 74 922 0 001 是selenium Se 34 78 971 0 008 r 78 971 0 008bromine Br 35 79 901 79 907 79 904 0 003krypton Kr 36 83 798 0 002 g m 83 798 0 002rubidium Rb 37 85 4678 0 0003 g 85 468 0 001strontium Sr 38 87 62 0 01 g r 87 62 0 01yttrium Y 39 88 905 838 0 000 002 88 906 0 001 是zirconium Zr 40 91 224 0 002 g 91 224 0 002niobium Nb 41 92 906 37 0 000 01 92 906 0 001 是molybdenum Mo 42 95 95 0 01 g 95 95 0 01technetiuma Tc 43ruthenium Ru 44 101 07 0 02 g 101 07 0 02rhodium Rh 45 102 905 49 0 000 02 102 91 0 01 是palladium Pd 46 106 42 0 01 g 106 42 0 01silver Ag 47 107 8682 0 0002 g 107 87 0 01cadmium Cd 48 112 414 0 004 g 112 41 0 01indium In 49 114 818 0 001 114 82 0 01tin Sn 50 118 710 0 007 g 118 71 0 01antimony Sb 51 121 760 0 001 g 121 76 0 01tellurium Te 52 127 60 0 03 g 127 60 0 03iodine I 53 126 904 47 0 000 03 126 90 0 01 是xenon Xe 54 131 293 0 006 g m 131 29 0 01caesium Cs 55 132 905 451 96 0 000 000 06 132 91 0 01 是barium Ba 56 137 327 0 007 137 33 0 01lanthanum La 57 138 905 47 0 000 07 g 138 91 0 01cerium Ce 58 140 116 0 001 g 140 12 0 01praseodymium Pr 59 140 907 66 0 000 01 140 91 0 01 是neodymium Nd 60 144 242 0 003 g 144 24 0 01promethiuma Pm 61samarium Sm 62 150 36 0 02 g 150 36 0 02europium Eu 63 151 964 0 001 g 151 96 0 01gadolinium Gd 64 157 25 0 03 g 157 25 0 03terbium Tb 65 158 925 354 0 000 007 158 93 0 01 是dysprosium Dy 66 162 500 0 001 g 162 50 0 01holmium Ho 67 164 930 329 0 000 005 164 93 0 01 是erbium Er 68 167 259 0 003 g 167 26 0 01thulium Tm 69 168 934 219 0 000 005 168 93 0 01 是ytterbium Yb 70 173 045 0 010 g 173 05 0 02lutetium Lu 71 174 9668 0 0001 g 174 97 0 01hafnium Hf 72 178 486 0 006 g 178 49 0 01tantalum Ta 73 180 947 88 0 000 02 180 95 0 01tungsten W 74 183 84 0 01 183 84 0 01rhenium Re 75 186 207 0 001 186 21 0 01osmium Os 76 190 23 0 03 g 190 23 0 03iridium Ir 77 192 217 0 002 192 22 0 01platinum Pt 78 195 084 0 009 195 08 0 02gold Au 79 196 966 570 0 000 004 196 97 0 01 是mercury Hg 80 200 592 0 003 200 59 0 01thallium Tl 81 204 382 204 385 204 38 0 01lead Pb 82 206 14 207 94 207 2 1 1bismutha Bi 83 208 980 40 0 000 01 208 98 0 01 是poloniuma Po 84astatinea At 85radona Rn 86franciuma Fr 87radiuma Ra 88actiniuma Ac 89thoriuma Th 90 232 0377 0 0004 g 232 04 0 01protactiniuma Pa 91 231 035 88 0 000 01 231 04 0 01 是uraniuma U 92 238 028 91 0 000 03 g m 238 03 0 01neptuniuma Np 93plutoniuma Pu 94americiuma Am 95curiuma Cm 96berkeliuma Bk 97californiuma Cf 98einsteiniuma Es 99fermiuma Fm 100mendeleviuma Md 101nobeliuma No 102lawrenciuma Lr 103rutherfordiuma Rf 104dubniuma Db 105seaborgiuma Sg 106bohriuma Bh 107hassiuma Hs 108meitneriuma Mt 109darmstadtiuma Ds 110roentgeniuma Rg 111coperniciuma Cn 112nihoniuma Nh 113fleroviuma Fl 114moscoviuma Mc 115livermoriuma Lv 116tennessinea Ts 117oganessona Og 118a此元素無穩定同位素 只有放射同位素 四種元素 Bi Th Pa U 有characteristic terrestrial isotopic composition 其標準原子質量is tabulated 其它三十四種元素的標準原子質量cannot determine b Ar E values and their uncertainties are given for normal materials and include evaluations of measurement uncertainty as well as natural variations in atomic weight where applicable The atomic weight of a normal material is expected to lie within the lower and upper endpoints of the standard atomic weight at the current status of knowledge If the uncertainty in Ar E is considered too large for a user s purpose for an element with measurable variations in atomic weight a value of Ar E with a lower uncertainty might be obtained by measurement of an individual specimen g Geological and biological materials are known in which the element has an isotopic composition outside the limits for normal material The difference between the atomic weight of the element in such materials and that given in the table may exceed the stated uncertainty m Modified isotopic compositions may be found in commercially available material because the material has been subjected to some undisclosed or inadvertent isotopic fractionation Substantial deviations in atomic weight of the element from that given in the table can occur r Range in isotopic composition of normal terrestrial material prevents a more precise standard atomic weight being given the tabulated value and uncertainty should be applicable to normal material 参见 编辑元素列表 元素周期表 同位素列表 取自 https zh wikipedia org w index php title 相对原子质量表 amp oldid 79413591, 维基百科,wiki,书籍,书籍,图书馆,

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