* Bonding: Nonmetals primarily form covalent bonds. Covalent bonds involve the sharing of electrons between atoms, creating strong bonds that require a lot of energy to break. This leads to higher melting points.

* Intermolecular Forces: While covalent bonds are strong within molecules, the forces between molecules (intermolecular forces) in nonmetals can vary. Some nonmetals exhibit strong intermolecular forces like hydrogen bonding, which contribute to higher melting points.

Examples:

* Diamond: One of the hardest known substances, is a nonmetal with an extremely high melting point (3550 °C).

* Silicon: Another nonmetal with a high melting point (1414 °C).

* Iodine: A nonmetal with a relatively low melting point (113 °C), but this is still significantly higher than many metals.

Metals, on the other hand, have low melting points due to:

* Metallic Bonding: Metals have a "sea" of delocalized electrons, creating weak bonds between metal atoms. This allows the atoms to slide past each other relatively easily, resulting in lower melting points.

Let me know if you have any other questions!