Group Ia: N a (Sodium), H (Hydrogen), K (Potassium), Group IIa: M g (Magnesium), B e (Beryllium), C a (Calcium), Group IIIa: B (Boron), A l (Aluminum), Group IVa: C (Carbon), S (Sulfur), Group Va: P (Phosphorus), N (Nitrogen), Group VIa: O (Oxygen), S i (Silicon), Group VIIa: C l (Chlorine), B r (Bromine), F (Flourine), Group VIIIa: N e (Neon), A r (Argon), H e (Helium),

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