First 20 elements of the periodic table with atomic mass and atomic no
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Answer: first 20 elements and tjeir symbols.
Hydrogen
H
Helium
He
Lithium
Li
Beryllium
Be
Boron
B
Carbon
C
Oxygen
O
Nitrogen
N
Fluorine
F
Neon
Ne
Sodium
Na
Magnesium
Mg
Aluminum
Al
Silicon
Si
Phosphorus
P
Sulfur
S
Chlorine
Cl
Argon
Ar
Potassium
K
Calcium
Ca
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