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Periodic Table Elements 1-20 by atomic number

atomic number, element abbreviation, element name, and approximate atomic mass
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1
H Hydrogen 1
2
He Helium 4
3
Li Lithium 7
4
Be Beryllium 9
5
B Boron 11
6
C Carbon 12
7
N Nitrogen 14
8
O Oxygen 16
9
F Fluorine 19
10
Ne Neon 20
11
Na Sodium 23
12
Mg Magnesium 24