1
H
Hydrogen
1.008
3
Li
Atomic Number
Lithium
Beryllium
9.012
12
Mg
Sodium
Potassium
39.098
37
Rb
Rubidium
85.468
55
Cs
Cesium
132.905
87
Fr
23
V
4
Be
6.941
11
Na
22.990
19
K
Periodic Table of the
Elements
Atomic Mass
Vanadium
50.942
2
He
Helium
4.003
5
B
Element Symbol
Boron
Element Name
10.811
13
Al
Magnesium
24.305
20
Ca
Calcium
40.078
38
Sr
Strontium
87.62
56
Ba
Barium
137.327
88
Ra
Aluminum
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
44.956
39
Y
47.88
40
Zr
50.942
41
Nb
51.996
42
Mo
54.938
43
Tc
55.847
44
Ru
58.933
45
Rh
58.693
46
Pd
63.546
47
Ag
65.39
48
Cd
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
88.906
91.224
92.906
95.94
97.907
101.07
102.906
106.42
107.868
112.411
71
Lu
72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury
174.967
103
Lr
178.49
104
Rf
180.948
105
Db
183.85
106
Sg
186.207
107
Bh
190.23
108
Hs
192.22
109
Mt
195.08
110
Uun
196.967
111
Uuu
200.59
112
Uub
6
C
Carbon
14.007
15
P
Silicon
Phosphorous
28.086
32
Ge
Gallium
Germanium
Indium
114.818
81
Tl
Thallium
204.383
113
Nitrogen
12.011
14
Si
26.982
31
Ga
69.723
49
In
7
N
72.61
50
Sn
Tin
118.710
82
Pb
Lead
207.2
114
Uuq
30.974
33
As
Arsenic
74.922
51
Sb
Antinmony
121.757
83
Bi
Bismuth
208.98
115
8
O
Oxygen
15.999
16
S
Sulphur
32.066
34
Se
Selenium
78.96
52
Te
Tellurium
127.60
84
Po
Polonium
208.982
116
Uuh
9
F
Fluorine
18.998
17
Cl
Chlorine
35.453
35
Br
Bromine
79.904
53
I
Iodine
126.904
85
At
Astatine
209.987
117
10
Ne
Neon
20.180
18
Ar
Argon
39.948
36
Kr
Krypton
83.80
54
Xe
Xenon
131.29
86
Rn
Radon
222.018
118
Uuo
Francium
Radium
Lawrencium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Ununnilium
Unununium
Ununbium
Ununquadium
Ununhexium
Ununoctium
223.02
226.025
260.105
261
262
263
264
265
268
269
272
277
285
289
293
57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
Lanthanum
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysporsium
Holmium
Erbium
Thulium
Ytterbium
138.906
89
Ac
140.115
90
Th
140.908
91
Pa
144.24
92
U
144.913
93
Np
150.36
94
Pu
151.965
95
Am
157.25
96
Cm
158.925
97
Bk
162.50
98
Cf
164.930
99
Es
167.26
100
Fm
168.934
101
Md
173.04
102
No
67
Ho
68
Er
69
Tm
70
Yb
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
227.028
232.038
231.036
238.029
237.048
244.064
243.061
247.070
247.070
251.08
252.083
257.095
258.099
259.101
In Lewis structures, these elements need only 2 electrons
In Lewis structures, these elements need only 4 electrons
In Lewis structures, these elements need only 6 electrons
In Lewis structures, these elements need 8 electrons
In Lewis structures, these elements need 8 electrons, but can hold more if they are the central atom