Draw up formulas of oxides and hydroxides of elements I, II periods and indicate their nature.

I period: H2O, HOH – basic oxide and hydroxide. Li2O, LiOH- basic oxide and hydroxide, Na2O, NaOH- basic oxide and hydroxide, K2O, KOH- basic oxide and hydroxide, CuO, (CuOH) 2- basic oxide and hydroxide, RbO, Rb (OH) 2-basic oxide and hydroxide, Ag2O, AgOH- basic oxide and hydroxide, CsO, CsOH- basic oxide and hydroxide, Au2O, Au (OH) 2-basic oxide and hydroxide, FrO, FrOH- basic oxide and hydroxide. II period: BeO, BeOH.MgO, MgOH.CaO, CaOH.ZnO, ZnOH.SrO, SrOH.CdO, CdOH.BaO, BaOH.HgO, HgOH.RaO, RaOH. As in the previous period, these oxides and hydroxides are basic.