the symbol for oxygen is O but to denote it any where we write O2
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O2 is the chemical symbol for oxygen as it exists in nature- 2 bounded oxygen atoms.
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O is an oxygen atom. It is one atom of oxygen. It is unstable on its own
O2 is a molecule of oxygen. Oxygen, as gas, exists are O2. It is stable.
O2 is a molecule of oxygen. Oxygen, as gas, exists are O2. It is stable.
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