how to find valency for first 20 elements with the diagram
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Explanation:
Valency of first 20 elements is given below.
Hydrogen (H) = 1.
Helium (He) = 0.
Lithium (Li) = 1.
Beryllium (Be) = 2.
Boron (B) = 3.
Carbon (C) = 4.
Nitrogen (N) = 3.
Oxygen (O) = 2.
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