List the elements that form basic oxide with oxygen.

Answer:

The oxides of the Group I and Group II elements react with water to form strongly basic solutions contains hydroxide anion, OH^–.

Basic oxide:

Metals react with oxygen to give basic compounds of oxygen. These compounds are usually ionic in nature. Group 1, 2 and lanthanides form basic compounds of oxygen when they react with dioxygen. During the formation of these compounds, a large amount of energy is released. These compounds readily react with water except a few exceptions.

Examples: M₂O₃, MO₂, ThO₂