* Elements: A pure substance consisting of only one type of atom. Examples of gaseous elements include:

* Oxygen (O₂): Found in the air we breathe.

* Nitrogen (N₂): The most abundant gas in the atmosphere.

* Helium (He): Used in balloons and as a coolant.

* Neon (Ne): Used in neon signs.

* Argon (Ar): An inert gas, often used in light bulbs.

* Compounds: Substances formed when two or more different elements chemically combine in a fixed ratio. Examples of gaseous compounds include:

* Carbon dioxide (CO₂): A greenhouse gas produced by respiration and burning.

* Methane (CH₄): A potent greenhouse gas, often found in natural gas.

* Ammonia (NH₃): Used in fertilizers and cleaning products.

* Water vapor (H₂O): The gaseous form of water.

So, whether a gas is an element or a compound depends on its composition.