1
H
Hydrogen
1.00794
6
He
Helium
4.002602
11
Li
Lithium
6.941
16
Be
Beryllium
9.012182
21
B
Boron
10.811
26
C
Carbon
12.0107
31
N
Nitrogen
14.0067
36
O
Oxygen
15.9994
41
F
Fluorine
18.9984032
46
Ne
Neon
20.1797
51
Na
Sodium
22.98976...
56
Mg
Magnesium
24.305
61
Al
Aluminium
26.9815386
66
Si
Silicon
28.0855
71
P
Phosphorus
30.973762
76
S
Sulfur
32.065
81
Cl
Chlorine
35.453
86
Ar
Argon
39.948
91
K
Potassium
39.948
96
Ca
Calcium
40.078
101
Sc
Scandium
44.955912
106
Ti
Titanium
47.867
111
V
Vanadium
50.9415
116
Cr
Chromium
51.9961
121
Mn
Manganese
54.938045
126
Fe
Iron
55.845
131
Co
Cobalt
58.933195
136
Ni
Nickel
58.6934
141
Cu
Copper
63.546
146
Zn
Zinc
65.38
151
Ga
Gallium
69.723
156
Ge
Germanium
72.63
161
As
Arsenic
74.9216
166
Se
Selenium
78.96
171
Br
Bromine
79.904
176
Kr
Krypton
83.798
181
Rb
Rubidium
85.4678
186
Sr
Strontium
87.62
191
Y
Yttrium
88.90585
196
Zr
Zirconium
91.224
201
Nb
Niobium
92.90628
206
Mo
Molybdenum
95.96
211
Tc
Technetium
(98)
216
Ru
Ruthenium
101.07
221
Rh
Rhodium
102.9055
226
Pd
Palladium
106.42
231
Ag
Silver
107.8682
236
Cd
Cadmium
112.411
241
In
Indium
114.818
246
Sn
Tin
118.71
251
Sb
Antimony
121.76
256
Te
Tellurium
127.6
261
I
Iodine
126.90447
266
Xe
Xenon
131.293
271
Cs
Caesium
132.9054
276
Ba
Barium
132.9054
281
La
Lanthanum
138.90547
286
Ce
Cerium
140.116
291
Pr
Praseodymium
140.90765
296
Nd
Neodymium
144.242
301
Pm
Promethium
(145)
306
Sm
Samarium
150.36
311
Eu
Europium
151.964
316
Gd
Gadolinium
157.25
321
Tb
Terbium
158.92535
326
Dy
Dysprosium
162.5
331
Ho
Holmium
164.93032
336
Er
Erbium
167.259
341
Tm
Thulium
168.93421
346
Yb
Ytterbium
173.054
351
Lu
Lutetium
174.9668
356
Hf
Hafnium
178.49
361
Ta
Tantalum
180.94788
366
W
Tungsten
183.84
371
Re
Rhenium
186.207
376
Os
Osmium
190.23
381
Ir
Iridium
192.217
386
Pt
Platinum
195.084
391
Au
Gold
196.966569
396
Hg
Mercury
200.59
401
Tl
Thallium
204.3833
406
Pb
Lead
207.2
411
Bi
Bismuth
208.9804
416
Po
Polonium
(209)
421
At
Astatine
(210)
426
Rn
Radon
(222)
431
Fr
Francium
(223)
436
Ra
Radium
(226)
441
Ac
Actinium
(227)
446
Th
Thorium
232.03806
451
Pa
Protactinium
231.0588
456
U
Uranium
238.02891
461
Np
Neptunium
(237)
466
Pu
Plutonium
(244)
471
Am
Americium
(243)
476
Cm
Curium
(247)
481
Bk
Berkelium
(247)
486
Cf
Californium
(251)
491
Es
Einstenium
(252)
496
Fm
Fermium
(257)
501
Md
Mendelevium
(258)
506
No
Nobelium
(259)
511
Lr
Lawrencium
(262)
516
Rf
Rutherfordium
(267)
521
Db
Dubnium
(268)
526
Sg
Seaborgium
(271)
531
Bh
Bohrium
(272)
536
Hs
Hassium
(270)
541
Mt
Meitnerium
(276)
546
Ds
Darmstadium
(281)
551
Rg
Roentgenium
(280)
556
Cn
Copernicium
(285)
561
Uut
Unutrium
(284)
566
Fl
Flerovium
(289)
571
Uup
Ununpentium
(288)
576
Lv
Livermorium
(293)
581
Uus
Ununseptium
(294)
586
Uuo
Ununoctium
(294)
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