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Elements are only those items found on the periodic table. There are just over a hundred different elements on the periodic table. Oxygen is one of them and it is also a gas.
However CO2 (Carabon Dioxide) is also a gas. It is not an element simply because it is made of two elements from the periodic table (Carbon and Oxygen). CO2 is a compound.
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because some gasses are compounds with multiple elements inside of it
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