Answer: Alkaline earth metals form basic oxides.
Explanation:
Elements of group 2 are also known as alkaline earth metals. For example, Be, Mg, Ca, Sr, Ba and Ra are all group 2 elements.
Being placed on the left side of periodic table, alkaline earth metals have large atomic radius but their radius is smaller than alkali metals (group 1).
When oxygen combines with a metal then it results in the formation of a basic oxide.
For example, MgO is a basic oxide of group 2 element.
Thus, we can conclude that alkaline earth metals form basic oxides.
