Covalent solid

Solid X is classified as a covalent solid. This can be determined based on its properties, which are described as follows:

Electrical insulator
Solid X is an electrical insulator in both its solid and molten states. This suggests that it does not contain any mobile charged particles, such as ions or electrons, that can carry an electric current. In covalent solids, the atoms are held together by strong covalent bonds, and these bonds do not allow for the easy movement of charges.

High melting point
Solid X has an extremely high melting point. This indicates that a significant amount of energy is required to break the strong covalent bonds holding the atoms together. Covalent bonds are formed by the sharing of electrons between atoms, and they are generally stronger than other types of bonds, such as ionic or metallic bonds. The high melting point of Solid X further supports its classification as a covalent solid.

Explanation

Covalent solids are composed of atoms held together by strong covalent bonds. In these solids, each atom is connected to its neighboring atoms through the sharing of electrons. This sharing of electrons creates a network of interconnected atoms. Examples of covalent solids include diamond, graphite, and silicon dioxide.

In the case of Solid X, the fact that it is an electrical insulator suggests that there are no mobile charged particles present. In covalent solids, the electrons are localized between the atoms, and they are not free to move throughout the material. This lack of mobile charges prevents the flow of electricity.

The high melting point of Solid X is a characteristic feature of covalent solids. The strong covalent bonds between the atoms require a significant amount of energy to break, resulting in a high melting point. The melting point is a measure of the strength of the forces holding the atoms together in a solid. In the case of covalent solids, the strong covalent bonds contribute to the high melting points.

In conclusion, based on the given properties of being an electrical insulator in solid and molten states and having an extremely high melting point, Solid X is classified as a covalent solid.

Covalent solid