Table Of Elements And Their Atomic Weights
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2APP19 table of elements.qxd
8/13/05
1:52 PM
Page APP 114
TABLE OF ELEMENTS AND THEIR ATOMIC WEIGHTS
Atomic
Atomic
Atomic
Atomic
Element
Symbol
Number
Weight
Element
Symbol
Number
Weight
Actinium
Ac
89
227.0278*
Neodymium
Nd
60
144.24
Aluminum
Al
13
26.981539
Neon
Ne
10
20.1797
Americium
Am
95
243.0614*
Neptunium
Np
93
237.0482*
Antimony
Sb
51
121.760
Nickel
Ni
28
58.6934
Argon
Ar
18
39.948
Niobium
Nb
41
92.90638
Arsenic
As
33
74.92159
Nitrogen
N
7
14.00674
Astatine
At
85
209.9871*
Nobelium
No
102
259.1009*
Barium
Ba
56
137.327
Osmium
Os
76
190.23
Berkelium
Bk
97
247.0703*
Oxygen
O
8
15.9994
Beryllium
Be
4
9.012182
Palladium
Pd
46
106.42
Bismuth
Bi
83
208.98037
Phosphorus
P
15
30.973762
Boron
B
5
10.811
Platinum
Pt
78
195.08
Bromine
Br
35
79.904
Plutonium
Pu
94
244.0642*
Cadmium
Cd
48
112.411
Polonium
Po
84
208.9824*
Calcium
Ca
20
40.078
Potassium
K
19
39.0983
Californium
Cf
98
251.0796*
Praseodymium
Pr
59
140.90765
Carbon
C
6
12.011
Promethium
Pm
61
144.9127*
Cerium
Ce
58
140.115
Protactinium
Pa
91
231.0388*
Cesium
Cs
55
132.90543
Radium
Ra
88
226.0254*
Chlorine
Cl
17
35.4527
Radon
Rn
86
222.0176*
Chromium
Cr
24
51.9961
Rhenium
Re
75
186.207
Cobalt
Co
27
58.93320
Rhodium
Rh
45
102.90550
Copper
Cu
29
63.546
Rubidium
Rb
37
85.4678
Curium
Cm
96
247.0703*
Ruthenium
Ru
44
101.07
Dysprosium
Dy
66
162.50
Samarium
Sm
62
150.36
Einsteinium
Es
99
252.083*
Scandium
Sc
21
44.955910
Erbium
Er
68
167.26
Selenium
Se
34
78.96
Europium
Eu
63
151.965
Silicon
Si
14
28.0855
Fermium
Fm
100
257.0951*
Silver
Ag
47
107.8682
Fluorine
F
9
18.9984032
Sodium
Na
11
22.989768
Francium
Fr
87
223.0197*
Strontium
Sr
38
87.62
Gadolinium
Gd
64
157.25
Sulfur
S
16
32.066
Gallium
Ga
31
69.723
Tantalum
Ta
73
180.9479
Germanium
Ge
32
72.61
Technetium
Tc
43
97.9072*
Gold
Au
79
196.96654
Tellurium
Te
52
127.60
Hafnium
Hf
72
178.49
Terbium
Tb
65
158.92534
Helium
He
2
4.002602
Thallium
Tl
81
204.3833
Holmium
Ho
67
164.93032
Thorium
Th
90
232.0381
Hydrogen
H
1
1.00794
Thulium
Tm
69
168.93421
Indium
In
49
114.818
Tin
Sn
50
118.710
Iodine
I
53
126.90447
Titanium
Ti
22
47.867
Iridium
Ir
77
192.217
Tungsten
W
74
183.84
Iron
Fe
26
55.845
Unnilquadium
Unq
104
261.11*
Krypton
Kr
36
83.80
Unnilpentium
Unp
105
262.114*
Lanthanum
La
57
138.9055
Unnilhexium
Unh
106
263.118*
Lawrencium
Lr
103
262.11*
Unnilseptium
Uns
107
262.12*
Lead
Pb
82
207.2
Uranium
U
92
238.0289
Lithium
Li
3
6.941
Vanadium
V
23
50.9415
Lutetium
Lu
71
174.967
Xenon
Xe
54
131.29
Magnesium
Mg
12
24.3050
Ytterbium
Yb
70
173.04
Manganese
Mn
25
54.93805
Yttrium
Y
39
88.90585
Mendelevium
Md
101
258.10*
Zinc
Zn
30
65.39
Mercury
Hg
80
200.59
Zirconium
Zr
40
91.224
Molybdenum
Mo
42
95.94
Based on 1993 IUPAC Table of Standard Atomic Weights of the Elements.
* Relative atomic mass of the isotope of that element with the longest known half-life.
APP 114
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