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Oxygen is a chemical element.
H2O is a compound composed of two elements, hydrogen and oxygen. It is not an element itself.
Neither. Oxygen is an element. In the air it forms a mixture with nitrogen, carbon dioxide, etc.
Air is a mixture; the properties of the constituents of air (oxygen, nitrogen, carbon dioxide etc.) are not changed, and the mass ratios among them are not as consistent as they would be if air were a compound. On distillation of liquefied air, nitrogen predominantly distills off first, leaving behind oxygen in the liquid form. This is characteristic of a mixture, not of a compound.
compound. has carbon and oxygen compound. has carbon and oxygen