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20 terms

First 20 Elements and atomic number

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Hydrogen
1
Helium
2
Lithium
3
Beryllium
4
Boron
5
Carbon
6
Nitrogen
7
Oxygen
8
Fluorine
9
Neon
10
Sodium
11
Magnesium
12
Aluminium
13
Silicon
14
Phosphorus
15
Sulfur
16
Chlorine
17
Argon
18
Potassium
19
Calcium
20