Chemistry - PERIODIC TABLE Question with Solution | TestHub

The acidic character of oxides generally increases across a period and decreases down a group. Cs₂O and Na₂O are basic (alkali metal oxides). MgO is basic (alkaline earth metal oxide). Al₂O₃ is amphoteric, showing both acidic and basic properties. Thus, the increasing order of acidic character is Cs₂O < Na₂O < MgO < Al₂O₃.