Question

Sodium oxide is an example of-

Answer 1

We need to know that in chemistry, periodic tables play a vital role. In the periodic table there are totally $118$ elements. In the periodic table there are totally $18$ columns and $7$ rows. The columns are called groups. Hence, $18$ groups in the periodic table. The rows are called periods. Hence, totally $7$ period in the table. Oxygen is one of the elements in the periodic table. The symbol of oxygen is ${\text{O}}$.Oxygen is one of the sixteen groups in the periodic table. The atomic number of Oxygen is $8$. The mass number of Oxygen is $16$. The valency of Oxygen is $2$. The stable oxidation state of Oxygen is $- 2$. The atomic number of the element is nothing but the number of electrons or number of protons. The mass number of the atom is nothing but the sum of the number of protons and number of neutrons. The formula of a chemical compound having one oxygen atom and another atom is called oxide. Oxygen is dianion because the oxidation state of Oxygen is $- 2$.

Complete answer:
We need to remember that the molecular formula of sodium oxide is $N{a_2}O$.
Sodium oxides are ionic bonds in nature. Sodium oxide is a one of the basic oxide. Because it is metallic oxide.
According to the above discussion, we conclude sodium oxide is an example of metallic oxide.

Note:
We have to know that the oxide of sodium, potassium and ammonium are soluble in water and oxides of calcium and barium are partially soluble in water. Simply said, oxide of alkaline elements are soluble in water. Alkaline elements are first group elements in the periodic table. Simply said means oxide of alkaline earth elements are partially soluble in water. Alkaline earth elements are second group elements in the periodic table.