Final answer:
Oxygen is classified as an element due to its composition of only one type of atom and inability to be separated into simpler substances.
Explanation:
Oxygen is an element because it is composed of only one kind of atom and cannot be separated into simpler substances. Elements, like oxygen, consist of identical atoms. In contrast, compounds are made up of two or more different elements bonded together in a fixed ratio, such as water (H2O).
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