First slide
Periodicity in atomic properties

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides 


As metallic character of element attached to oxygen atom increases, the difference between the electronegativity values of element and oxygen increases and thus basic character of oxides increases and vice-versa. Hence the increasing correct order of basic nature Al2O3<MgO<Na2O<K2O.

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