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Hydrogen
1
Helium
2
Lithium
3
Berylium
4
Boron
5
Carbon
6
Nitrogen
7
Oxygen
8
Fluorine
9
Neon
10
Sodium
11
Magnesium
12
Aluminium
13
Silicon
14
Phosphorous
15
Sulphur
16
Chlorine
17
Argon
18
Pottasium
19
Caclium
20