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| Atomic Weights and Isotopic Compositions for All Elements* |
| Isotope |
Relative Atomic Mass |
Isotopic Composition |
Standard Atomic Weight |
|
|
H |
1 |
1.007 825 032 23(9) |
0.999 885(70) |
1.007 94(7) |
| D |
2 |
2.014 101 778 12(12) |
0.000 115(70) |
| 3 |
Li |
6 |
6.015 122 8874(16) |
0.0759(4) |
6.941(2) |
| 7 |
7.016
003 4366(45) |
0.9241(4) |
| 5 |
B |
10 |
10.012 936 95(41) |
0.199(7) |
10.811(7) |
| 11 |
11.009
305 36(45) |
0.801(7) |
| 6 |
C |
12 |
12.000 000 0(0) |
0.9893(8) |
12.0107(8) |
| 13 |
13.003
354 835 07(23) |
0.0107(8) |
| 7 |
N |
14 |
14.003 074 004 43(20) |
0.996 36(20) |
14.0067(2) |
| 15 |
15.000
108 898 88(64) |
0.003 64(20) |
| 8 |
O |
16 |
15.994
914 619 57(17) |
0.997 57(16) |
15.9994(3) |
| 17 |
16.999
131 756 50(69) |
0.000 38(1) |
| 18 |
17.999
159 612 86(76) |
0.002 05(14) |
| 11 |
Na |
23 |
22.989 769 2820(19) |
1.0000 |
22.989 769 28(2) |
| 15 |
P |
31 |
30.973
761 998 42(70) |
1.0000 |
30.973 762(2) |
| 16 |
S |
32 |
31.972
071 1744(14) |
0.9499(26) |
32.065(5) |
| 33 |
32.971
458 9098(15) |
0.0075(2) |
| 34 |
33.967
867 004(47) |
0.0425(24) |
| 36 |
35.967
080 71(20) |
0.0001(1) |
| 19 |
K |
39 |
38.963
706 4864(49) |
0.932 581(44) |
39.0983(1) |
| 40 |
39.963
998 166(60) |
0.000 117(1) |
| 41 |
40.961
825 2579(41) |
0.067 302(44) |
| Atomic and Nuclear Constants* (unified atomic mass unit, u) |
|
|
Proton, 1H+ |
1.007 276 466 879(91) |
|
|
| e |
electron |
5.485 799 090 70(16) x 10-4 |
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| *NIST Physical
Measurement Laboratory (http://www.nist.gov/pml/data/comp.cfm) |
| NIST Standard
Reference Database 144 |
| Standard Atomic Weight from ATOMIC WEIGHTS OF THE ELEMENTS 2001 |
| Go to amino acid molecular masses
(http://www.riken.jp/BiomolChar/files/Aminoacidmolecularmasses.htm) |
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