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1st element
Hydrogen
2nd element
Helium
3rd element
Lithium
4th element
Beryllium
5th element
Boron
6th element
Carbon
7th element
Nitrogen
8th Element
Oxygen
9th element
Fluorine
10th element
Neon
11th element
Sodium
12th element
Magnesium
13th element
Aluminium
14th element
silicon
15th element
phosphorus
16th element
Sulfur
17th Element
Chlorine
18th Element
Argon
19th element
Potassium
20th Element
Calcium