1
H
Hydrogen
1.008
                2
He
Helium
4.003
3
Li
Lithium
6.94
4
Be
Beryllium
9.012
          5
B
Boron
10.81
6
C
Carbon
12.01
7
N
Nitrogen
14.01
8
O
Oxygen
16
9
F
Flurine
18
10
Ne
Neon
20.18
11
Na
Sodium
22.99
12
Mg
Magnesium
24.31
          13
Al
Aluminum
26.98
14
Si
Silicon
28.09
15
P
Phosphorus
30.97
16
S
Sulfur
32.08
17
Cl
Chlorine
35.45
18
Ar
Argon
39.95
19
K
Potassium
39.1
20
Ca
Calcium
40.08
21
Sc
Scandium
44.9559
22
Ti
Titanium
47.867
23
V
Vanadium
50.9415
24
Cr
Chromium
51.9961
25
Mn
Manganese
54.938
26
Fe
Iron
55.845
27
Co
Cobalt
58.9332
28
Ni
Nickel
58.6934
29
Cu
Copper
63.546
30
Zn
Zinc
65.39
31
Ga
Gallium
69.723
32
Ge
Germanium
72.61
33
As
Arsenic
74.9216
34
Se
Selenium
78.96
35
Br
Bromine
79.904
36
Kr
Krypton
83.8
37
Rb
Rubidum
85.4678
38
Sr
Strontium
87.62
39
Y
Yttrium
88.9059
40
Zr
Zirconium
91.224
41
Nb
Niobium
92.9064
42
Mo
Molybdenum
95.54
43
Tc
Technetium
98
44
Ru
Ruthenium
101.07
45
Rh
Rhodium
102.906
46
Pd
Palladium
106.42
47
Ag
Silver
107.868
48
Cd
Cadmiun
112.411
49
In
Indium
114.818
50
Sn
Tin
118.71
51
Sb
Antimony
121.76
52
Te
Tellurium
127.6
53
I
Iodine
126.904
54
Xe
Xenon
131.29
55
Cs
Cesium
132.905
56
Ba
Barium
137.327
 72
Hf
Hafnium
178.49
73
Ta
Tantalum
180.948
74
W
Tungsten
183.85
75
Re
Rhenium
186.207
76
Os
Osmiun
190.2
77
Ir
Iridium
192.77
78
Pt
Platinum
195.08
79
Au
Gold
196.967
80
Hg
Mercury
200.59
81
Ti
Thallium
204.383
82
Pb
Lead
207.2
83
Bi
Bismuth
208.98
84
Po
Polonium
209
85
At
Astitine
210
86
Rn
Radon
222
87
Fr
Francium
223
88
Ra
Radium
226
 104
Rf
Rutherfordium
267
105
Db
Dubnium
268
106
Sg
Seborgium
269
107
Bh
Bohrium
270
108
Hs
Hassium
277
109
Mt
Meitnerium
278
110
Ds
Darmstadtium
281
111
Rg
Roentgenium
282
112
Cn
Copernicium
112
113
Nh
Nihonium
286
114
Fl
Flerovium
289
115
Mc
Moscovium
290
116
Lv
Livermorium
293
117
Ts
Tennessine
294
118
Og
Oganesson
294
                  
   57
La
Lanthanum
138.906
58
Ce
Cerium
140.12
59
Pr
Praseodymium
140.91
60
Nd
Neodymiun
144.24
61
Pm
Promethium
145
62
Sm
Samarium
150.36
63
Eu
Europium
151.96
64
Gd
Gadolimium
157.25
65
Tb
Terbium
158.93
66
Dy
Dysprosium
162.5
67
Ho
Holmium
164.93
68
Er
Erbium
167.26
69
Tm
Thulium
168.93
70
Tb
Ytterbium
173.05
71
Lu
Lutetium
174.97
   89
Ac
Actinium
227
90
Th
Thorium
232.04
91
Pa
Protactinium
231.035
92
U
Uranium
238.03
93
Np
Neptunium
237
94
Pu
Plutonium
244
95
Am
Americium
243
96
Cm
Curium
247
97
Bk
Berkelium
247
98
Cf
Californium
251
99
Es
Einsteinium
252
100
Fm
Fermium
257
101
Md
Mendelevium
258
102
No
Nobelium
259
103
Lr
Lawrencium
266