Answers

2014-08-27T21:32:44+05:30
O is an element
O2 is a molecule. both are same
0
2014-08-27T21:46:57+05:30
O2 is a molecule consisting of combination of 2 atoms of oxygen. 2O denotes two seperate oxygen atoms. O2 is a molecule and thus it is stable. 2O, which consists of 2 different atoms and thus these 2 atoms are ready to combine with any other element like hydrogen.
2 4 2
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