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2015-03-16T15:28:50+05:30

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O2 is a molecules of oxygen.
2O is two atoms of oxygen.
3 3 3
2015-03-16T16:01:33+05:30

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O2 is a molecule of oxygen
20 means 2 atoms of oxygen
0
good qestion!
O2 represents the stable form of oxygen gas. The oxygen in the air is the diatomic molecule. Atomic oxygen may appear in chemical equations, usually as an unstable intermediate.

As in ...
4Na(s) + O2 --> 2Na2O
or
O2 --UV--> 2O
O + O2 --> O3
In these hypothetical mechanism oxygen is broken apart into unstable oxygen atoms. One of these quickly reacts with an O2 molecule to form ozone.