* Strong intermolecular forces: Solids have strong attractive forces between their molecules (like ionic bonds, covalent bonds, or metallic bonds). These forces require a lot of energy to break, which is why they need a high temperature to melt.

* Ordered structure: The molecules in a solid are arranged in a highly ordered, rigid structure. This arrangement contributes to the strength of the intermolecular forces and requires more energy to disrupt.

Exceptions:

While most solids have high melting points, there are some exceptions. For example, some molecular solids like ice have relatively low melting points due to weak hydrogen bonds holding the molecules together.