Q1. Complete the following table. Elctron config Valency Element Atomic numbea -usation 1 Valence bec toons 1 1 1 Hydrogen 2 O 2. 2 Helium 1 1 2,1 Lithium 3 2 4 Beryllium 5. Boson 3 2,3 2,4 Carbon 2 3 Nitrogen
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