Covalent network solids typically have high melting points and boiling points.
The chemical formula of a network solid indicates in the molecule by a a formula unit.
Covalent-network solid is a chemical compound (or element) in which the atoms are bonded by covalent bonds in a continuous network extending throughout the material.
For example, SiO₂ is a covalent-network solid.
Silicon Dioxide has a high melting point, around 1700°C.
Silicon(IV) oxide has continuous three-dimensional network of SiO₂ units.
The first two are high and im not sure about the last one but it is for sure not only types of atoms hope this helps you out.