Answer :

(a) H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca


(b) Group 1 — H, Li, Na, K


Group 2 — Be, Mg, Ca


Group 13 — B, Al


Group 14 — C, Si


Group 15 — N, P


Group 16 — O, S


Group 17 — F, Cl


Group 18 — He, Ne, Ar


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