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2016-03-20T20:49:16+05:30
Hno3   5 atoms
carbonate  4 atoms
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2016-03-20T20:51:56+05:30

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In CO3^2- = 4 atoms - 1 carbon atom and 3 oxygen atoms
In HNO3 = 5 atoms - 1 Hydrogen atom, 1 Nitrogen atom and 3 Oxygen atoms.
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