13 14 15 16 17 18
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2 Boron
5
B
Carbon
6
C
Nitrogen
7
N

8
O
Fluorine
9
F
Neon
10
Ne
3 Aluminium
13
Al
Silicon
14
Si
Phosphorus
15
P
Sulfur
16
S
Chlorine
17
Cl
Argon
18
Ar
4 Gallium
31
Ga
Germanium
32
Ge
Arsenic
33
As
Selenium
34
Se
Bromine
35
Br
Krypton
36
Kr
5 Indium
49
In
Tin
50
Sn
Antimony
51
Sb
Tellurium
52
Te
Iodine
53
I
Xenon
54
Xe
6 Thallium
81
Tl
Lead
82
Pb
Bismuth
83
Bi
84
Po
85
At

86
Rn