Answers

2015-10-15T18:17:11+05:30
O2 is the chemical symbol for oxygen as it exists in nature- 2 bounded oxygen atoms.

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2015-10-15T23:58:14+05:30
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.

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