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Monovalent H Cl Br I Na K Cu(I) Ag Au(I) Divalent O S Mg Ca Ba Zn Pb Cu(ii) Fe(ii) Sn(ii) Trivalent Boron N P(iii) Al Fe(iii) Au(iii) Tetravalent C Si S(iv) Sn(iv) Pentavalent P(v) Hexavalent S(vi)
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