Answers

2014-10-16T00:38:49+05:30
One atom of oxygen.
2 free atoms of oxygen.
2 atoms of oxygen.
3 molecules of oxygen each containing 2 atoms.
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2014-10-16T18:13:08+05:30

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O means a single atom of oxygen.
2 O means 2 atoms of oxygen.
O₂ means a single molecule of oxygen.
3O₂ means 3 molecules of oxygen.
3 4 3