Air is a mixture of different gases, not a single element. Therefore, it does not have an atomic number.

Here's a breakdown:

* Atomic number refers to the number of protons in the nucleus of an atom. It's a unique identifier for each element.

* Air is composed of primarily nitrogen (N), oxygen (O), and smaller amounts of argon (Ar), carbon dioxide (CO2), and other gases. Each of these components has its own atomic number:

* Nitrogen (N): Atomic number 7

* Oxygen (O): Atomic number 8

* Argon (Ar): Atomic number 18

Since air is a mixture, not a single element, it doesn't have a specific atomic number.