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2014-05-08T16:16:07+05:30

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Generally all standards are determined by the IUPAC system know. International union of pure and applied chemistry. IUPAC chose carbon 12 as the standard because it is a naturally occurring abundant solid and can easily form a lot of compounds with other elements. It is extremely stable too. Because of these unique properties, it is chosen as standard.
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Generally all standards are determined by the IUPAC(International union of pure and applied chemistry) system only . International union of pure and applied chemistry. IUPAC chose carbon 12 as the standard because it is a naturally occurring abundant solid and can easily form a lot of compounds with other elements. It is extremely stable too. Because of these unique properties, it is chosen as standard. (copied and pasted the answer for my book
2014-05-09T12:01:21+05:30
IUPAC USES CARBON-12 AS STANDARD NOW BECAUSE 
1. CARBON-12 IS A SOLID AND CAN BE EASILY HANDELED
2. NATURALLY OCCURING CARBON-12 IS IN ABUNDANCE
3. CARBON-12 CAN FORM MANY COMPOUNDS WITH OTHER ELEMENTS ON EARTH AND CAN BE EASILY COMPARED
4. CARBON-12 IS A STABLE ELEMENT 

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