Learn 20 elements of the periodic table
1.Hydrogen
2.Helium
3.Lithium
4.Berliyium
5.Boron
6.Carbon
7.Nitrogen
8.Oxygen
9.Flurine
10.Neon
11.Sodium
12.Magnesium
13.Aluminium
14.Silicon
15.Phosphorous
16.Sulphur
17.Chlorine
18.Argon
19.Pottasium
20.Calcium
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