Question

In the modern periodic table, which are metals, non-metals and metalloids among the first twenty elements.

Answer 1

Among first 20
Metals-
Lithium(Li), Beryllium(Be), Sodium(Na), Magnesium(Mg),Aluminium(Al), Potassium(K) and Calcium(Ca)

Non-metals-
Hydrogen(H), Helium(He),Carbon(C), Nitrogen(N), Oxygen(O),Fluorine(F), Neon(Ne), Phosphorus(P), Sulfur(S), Chlorine(Cl) and Argon(Ar)

Metalloids-
Boron(B) and Silicon(Si)

Answer 2

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