IDROGENO (H) - 1, ELIO (He) - 2, LITIO (Li) - 3, BERILLIO (Be) - 4, BORO (B) - 5, CARBONIO (C) - 6, AZOTO (N) - 7, OSSIGENO (O) - 8, FLUORO (F) - 9, NEON (Ne) - 10, SODIO (Na) - 11, MAGNESIO (Mg) - 12, ALLUMINIO (Al) - 13, SILICIO (Si) - 14, FOSFORO (P) - 15, ZOLFO (S) - 16, CLORO (Cl) - 17, ARGON (Ar) - 18, POTASSIO (K) - 19, CALCIO (Ca) - 20,

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