Which substances are combinations of non metals?

Substances that are combinations of nonmetals include molecular compounds such as water (H₂O), carbon dioxide (CO₂), and ammonia (NH₃). These compounds typically form through covalent bonding, where nonmetals share electrons. Other examples include sulfur dioxide (SO₂) and phosphorus pentachloride (PCl₅). In general, nonmetals can combine in various ways to create a wide range of chemical compounds.