What are the 20 first elements?
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Answer:
Hydrogen - H
Helium - He
Lithium - Li
Beryllium - Be
Boron - B
Carbon - C
Nitrogen - N
Oxygen - O
Fluorine - F
Neon - Ne
Sodium - Na
Magnesium - Mg
Aluminum (or Aluminium) - Al
Silicon - Si
Phosphorus - P
Sulfur - S
Chlorine - Cl
Argon - Ar
Potassium - K
Calcium - Ca
Explanation:
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