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+1+2 Hg Cu +1+3+5+7 Cl Br I As CN F
+1+3 Au Tl +2+4+6 O S Se Te
+2+3 Fe Mn Cr Co Ni +3+5 N P Sb As B
+2+4 Sn Pb Pl +2+4 C Si Ge
+3+5 V Nb Ta