Among the following, which is an element?

Explanation:

An element is a pure substance made of only one type of atom. Among the given options:

• Carbon (C): It is an element because it consists of only one type of atom.
• Water (H₂O): It is a compound made of hydrogen and oxygen atoms.
• Air: It is a mixture of different gases like nitrogen, oxygen, and carbon dioxide.

Final Answer

Thus, Carbon is the only element in the list.