First 20 Elements
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20 Terms
1
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Hydrogen
H
2
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Helium
He
3
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Lithium
Li
4
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Beryllium
Be
5
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Boron
B
6
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Carbon
C
7
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Nitrogen
N
8
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Oxygen
O
9
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Fluorine
F
10
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Neon
Ne
11
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Sodium
Na
12
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Magnesium
Mg
13
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Aluminum
Al
14
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Silicon
Si
15
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Phosphorus
P
16
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Sulphur
S
17
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Chlorine
Cl
18
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Argon
Ar
19
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Potassium
K
20
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Calcium
Ca
Note 
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