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Hydrogen no. and symbol
1, H
Helium no. and symbol
2, He
Lithium no. and symbol
3, Li
Beryllium no. and symbol
4, Be
Boron no. and symbol
5, B
Carbon no. and symbol
6, C
Nitrogen no. and symbol
7, N
Oxygen no. and symbol
8, O
Fluorine no. and symbol
9, F
Neon no. and symbol
10, Ne
Sodium no. and symbol
11, Na
Magnesium no. and symbol
12, Mg
Aluminum no. and symbol
13, Al
Silicon no. and symbol
14, Si
Phosphorus no. and symbol
15, P
Sulfur no. and symbol
16, S
Chlorine no. and symbol
17, Cl
Argon no. and symbol
18, Ar
Potassium no. and symbol
19, K
Calcium no. and symbol
20, Ca