1
Hydrogen
H
2
Helium
He
3
Lithium
Li
4
Beryllium
Be
5
Boron
B
6
Carbon
C
7
Nitrogen
N
8
Oxygen
O
9
Fluorine
F
10
Neon
Ne
11
Sodium
Na
12
Magnesium
Mg
13
Aluminum
Al
14
Silicon
Si
15
Phosphorus
P
16
Sulfur
S
17
Chlorine
Cl
18
Argon
Ar
19
Potassium
K
20
Calcium
Ca
21
Chromium
Cr
22
Iron
Fe
23
Nickel
Ni
24
Copper
Cu
25
Zinc
Zn
26
Bromine
Br
27
Krypton
Kr
28
Silver
Ag
29
Tin
Sn
30
Iodine
I
31
Xenon
Xe
32
Barium
Ba
33
Platinum
Pt
34
Gold
Au
35
Mercury
Hg
36
Lead
Pb
37
Radon
Rn