Explain the basic character of oxides of elements down the group and across the period.

(N/A) The basic nature of oxides decreases across a period from left to right. It changes from basic to acidic.
The basic nature of oxides increases down a group from top to bottom.
These variations in the acidic and basic nature of oxides are related to the electronegativity of the element. As the electronegativity of the element increases along a period,the acidic character of the oxide increases. Conversely,as the electronegativity of the element decreases down a group,the basic character of the oxide increases.