Answer: Nitrogen, Oxygen, Argon, Helium and Neon are elements.
Step-by-step explanation:
The main components of air are:
Nitrogen (78%)
Oxygen (21%)
Carbon dioxide (0. 04%)
Argon (0. 93%)
Trace amounts of helium, neon, methane, hydrogen and water vapour.
Out of all these components here, Nitrogen, Oxygen, Argon, Helium and Neon are elements. We can tell that because element is a chemical substance that cannot be broken down into other substances, and here we can see that unlike methane(CH₄), Carbor dioxide (CO₂) or water vapor(H₂O) , these elements cannot be broken down into anything simpler.
hope that helps...