Alcătuiți formulele moleculare după valenţele, gradele de oxi- dare ale atomilor sau *sarcinilie ionilor indicate deasupra formulelor:
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Răspuns:
a) Na2O, MgO, Al2O3, SiO2, P2O5, SO3, ,Cl2O7
b)B2O3, CO2, CO, N2O5, NO, P2O5, SO2, SO3
c) CH4, NH3, PH3, AsH3,H2O, H2S, H2Se, HF, HCl, HBr, HI
d) HNO3, H2SO4, H2CO3, H2SiO3, H3PO4
e) NaOH, KOH, NH4OH, Ba(OH)2, Ca(OH)2, Mg(OH)2