Covalent Molecules, NO2, SO2, H2O, PI3, O2, N2H2, CO2, HF, NBr3, CCl4, CBr4, HCl, Ionic Compounds, Fe2O3, CaCl2, NaCl, Al2O3, MgBr2, CaO, K2O, AlF3, CuCl2, Rb2S, K2S, Na3P.

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