20 terms

first 20 elements on periodic table

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H2
Hydrogen
He
Helium
Li
Lithium
Be
beryllium
B
Boron
C
Carbon
N2
Nitrogen
O2
Oxygen
F2
Flourine
Ne
Neon
Na
Sodium
Mg
Magnesium
Al
Aluminum
Si
Silicon
P
Phosphorus
S
Sulfur
CL2
Chlorine
Ar
Argon
K
Potassium
Ca
Calcium