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Learn about the interesting uses and cool properties of gas as well as a variety of facts about natural gas, noble gases, air, the ozone layer and much more. 1. Like solids and liquids, gas is a common state of matter.2. Pure gases are made up of just one atom. Neon is an example of a pure gas.3. Elemental gases are made up of two or more of the same atoms joined together. Hydrogen gas (H2) is an example an elemental gas.4. Compound gases contain a combination of different atoms. Carbon monoxide (CO) is an example of a compound gas.5....