Hydrogen
H
1
Helium
He
2
Lithium
Li
3
Beryllium
Be
4
Boron
B
5
Carbon
C
6
Nitrogen
N
7
Oxygen
O
8
Fluorine
F
9
Neon
Ne
10
Sodium
Na
11
Magnesium
Mg
12
Aluminum
Al
13
Silicon
Si
14
Phosphorus
P
15
Sulfur
S
16
Chlorine
Cl
17
Argon
Ar
18
Potassium
K
19
Calcium
Ca
20
Scandium
Sc
21
Titanium
Ti
22
Vanadium
V
23
Chromium
Cr
24