ATOMIC WEIGHTS (Alphabetical Order) - MedicinesComplete

Element Symbol
Atomic
number
ATOMIC WEIGHTS
(Alphabetical Order)
Atomic
weight
ActiniumAc 89 227.0277*
Aluminum Al 13 26.9815386
Americium Am 95 243.0614*
Antimony Sb 51 121.760
Argon Ar 18 39.948
Arsenic As 33 74.92160
Astatine At 85 209.9871*
BariumBa 56 137.327
BerkeliumBk 97 247.0703*
BerylliumBe 4 9.012182
Bismuth Bi 83 208.98040
BohriumBh 107 264.12*
Boron B 5 10.811
Bromine Br 35 79.904
Cadmium Cd 48 112.411
CalciumCa 20 40.078
CaliforniumCf 98 251.0796*
Carbon C 6 12.0107
CeriumCe 58 140.116
CesiumCs 55 132.9054519
Chlorine Cl 17 35.453
Chromium Cr 24 51.9961
Cobalt Co 27 58.933195
Copper Cu 29 63.546
CuriumCm96 247.0704*
DubniumDb 105 262.1141*
DysprosiumDy 66 162.500
EinsteiniumEs 99 252.0830*
ErbiumEr 68 167.259
EuropiumEu 63 151.964
Fermium Fm 100 257.0951*
Fluorine F 9 18.9984032
FranciumFr 87 223.0197*
GadoliniumGd 64 157.25
GalliumGa 31 69.723
Germanium Ge 32 72.64
Gold Au 79 196.966569
HafniumHf 72 178.49
HeliumHe 2 4.002602
Holmium Ho 67 164.93032
Hydrogen H 1 1.00794
IndiumIn 49 114.818
Iodine I 53 126.90447
IridiumIr 77 192.217
Iron Fe 26 55.845
Krypton Kr 36 83.798
LanthanumLa 57 138.90547
LawrenciumLr 103 262.1097*
Lead Pb 82 207.2
LithiumLi 3 6.941
LutetiumLu 71 174.967
MagnesiumMg 12 24.3050
Manganese Mn 25 54.938045
MeitneriumMt 109 268.1388*
MendeleviumMd 101 258.0984*
Element Symbol
Atomic
number
Atomic
weight
Mercury Hg 80 200.59
MolybdenumMo 42 95.94
Neodymium Nd 60 144.242
Neon Ne 10 20.1797
NeptuniumNp 93 237.0482*
Nickel Ni 28 58.6934
NiobiumNb 41 92.90638
Nitrogen N 7 14.0067
NobeliumNo 102 259.1010*
Osmium Os 76 190.23
Oxygen O 8 15.9994
PalladiumPd 46 106.42
Phosphorus P 15 30.973762
PlatinumPt 78 195.084
PlutoniumPu 94 244.0642*
PoloniumPo 84 208.9824*
PotassiumK 19 39.0983
Praseodymium Pr 59 140.90765
Promethium Pm 61 144.9127*
ProtactiniumPa 91 231.03588*
RadiumRa 88 226.0254*
Radon Rn 86 222.0176*
RheniumRe 75 186.207
RhodiumRh 45 102.90550
RoentgeniumRg 111 272.1535*
RubidiumRb 37 85.4678
RutheniumRu 44 101.07
RutherfordiumRf 104 261.1088*
Samarium Sm 62 150.36
ScandiumSc 21 44.955912
SeaborgiumSg 106 266.1219*
SeleniumSe 34 78.96
Silicon Si 14 28.0855
Silver Ag 47 107.8682
SodiumNa 11 22.98976928
StrontiumSr 38 87.62
Sulfur S 16 32.065
TantalumTa 73 180.94788
TechnetiumTc 43 97.9072*
TelluriumTe 52 127.60
TerbiumTb 65 158.92535
ThalliumTl 81 204.3833
ThoriumTh 90 232.03806*
ThuliumTm69 168.93421
Tin Sn 50 118.710
TitaniumTi 22 47.867
Tungsten W 74 183.84
UraniumU 92 238.02891
VanadiumV 23 50.9415
Xenon Xe 54 131.293
YtterbiumYb 70 173.04
YttriumY 39 88.90585
Zinc Zn 30 65.409
ZirconiumZr 40 91.224
Based on IUPAC 2001 Table of Standard Atomic Weights of the Elements and IUPAC 2005 Revised Standard Atomic Weights.
* Relative atomic mass of the isotope of that element of longest known half-life.
Copyright © 2006 Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc.,
Whitehouse Station, N.J., U.S.A. All rights reserved.

Atomic
number
Element Symbol
ATOMIC WEIGHTS
(Order of Atomic Number)
Atomic
weight
1 Hydrogen H 1.00794
2 HeliumHe 4.002602
3 LithiumLi 6.941
4 BerylliumBe 9.012182
5 Boron B 10.811
6 Carbon C 12.0107
7 Nitrogen N 14.0067
8 Oxygen O 15.9994
9 Fluorine F 18.9984032
10 Neon Ne 20.1797
11 SodiumNa 22.98976928
12 MagnesiumMg 24.3050
13 Aluminum Al 26.9815386
14 Silicon Si 28.0855
15 Phosphorus P 30.973762
16 Sulfur S 32.065
17 Chlorine Cl 35.453
18 Argon Ar 39.948
19 PotassiumK 39.0983
20 CalciumCa 40.078
21 ScandiumSc 44.955912
22 TitaniumTi 47.867
23 VanadiumV 50.9415
24 Chromium Cr 51.9961
25 Manganese Mn 54.938045
26 Iron Fe 55.845
27 Cobalt Co 58.933195
28 Nickel Ni 58.6934
29 Copper Cu 63.546
30 Zinc Zn 65.409
31 GalliumGa 69.723
32 Germanium Ge 72.64
33 Arsenic As 74.92160
34 SeleniumSe 78.96
35 Bromine Br 79.904
36 Krypton Kr 83.798
37 RubidiumRb 85.4678
38 StrontiumSr 87.62
39 YttriumY 88.90585
40 ZirconiumZr 91.224
41 NiobiumNb 92.90638
42 MolybdenumMo 95.94
43 TechnetiumTc 97.9072*
44 RutheniumRu 101.07
45 RhodiumRh 102.90550
46 PalladiumPd 106.42
47 Silver Ag 107.8682
48 Cadmium Cd 112.411
49 IndiumIn 114.818
50 Tin Sn 118.710
51 Antimony Sb 121.760
52 TelluriumTe 127.60
53 Iodine I 126.90447
54 Xenon Xe 131.293
55 CesiumCs 132.9054519
Atomic
number
Element Symbol
Atomic
weight
56 BariumBa 137.327
57 LanthanumLa 138.90547
58 CeriumCe 140.116
59 Praseodymium Pr 140.90765
60 Neodymium Nd 144.242
61 Promethium Pm 144.9127*
62 Samarium Sm 150.36
63 EuropiumEu 151.964
64 GadoliniumGd 157.25
65 TerbiumTb 158.92535
66 DysprosiumDy 162.500
67 Holmium Ho 164.93032
68 ErbiumEr 167.259
69 ThuliumTm168.93421
70 YtterbiumYb 173.04
71 LutetiumLu 174.967
72 HafniumHf 178.49
73 TantalumTa 180.94788
74 Tungsten W 183.84
75 RheniumRe 186.207
76 Osmium Os 190.23
77 IridiumIr 192.217
78 PlatinumPt 195.084
79 Gold Au 196.966569
80 Mercury Hg 200.59
81 ThalliumTl 204.3833
82 Lead Pb 207.2
83 Bismuth Bi 208.98040
84 PoloniumPo 208.9824*
85 Astatine At 209.9871*
86 Radon Rn 222.0176*
87 FranciumFr 223.0197*
88 RadiumRa 226.0254*
89 ActiniumAc 227.0277*
90 ThoriumTh 232.03806*
91 ProtactiniumPa 231.03588*
92 UraniumU 238.02891
93 NeptuniumNp 237.0482*
94 PlutoniumPu 244.0642*
95 Americium Am 243.0614*
96 CuriumCm247.0704*
97 BerkeliumBk 247.0703*
98 CaliforniumCf 251.0796*
99 EinsteiniumEs 252.0830*
100 Fermium Fm 257.0951*
101 MendeleviumMd 258.0984*
102 NobeliumNo 259.1010*
103 LawrenciumLr 262.1097*
104 RutherfordiumRf 261.1088*
105 DubniumDb 262.1141*
106 SeaborgiumSg 266.1219*
107 BohriumBh 264.12*
109 MeitneriumMt 268.1388*
111 RoentgeniumRg 272.1535*
Based on IUPAC 2001 Table of Standard Atomic Weights of the Elements and IUPAC 2005 Revised Standard Atomic Weights.
* Relative atomic mass of the isotope of that element of longest known half-life.
Copyright © 2006 Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc.,
Whitehouse Station, N.J., U.S.A. All rights reserved.