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2015-11-05T15:32:25+05:30

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Atomic Mass : 
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tomic mass of an element is the number of times the atom of the element is heavier than 1/12th of C-12 atom.
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number of times as heavy as 1/12 C
2015-11-05T15:37:03+05:30

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atomic mass is the sum of protons and neutrons  present in an element .atomic mass of carbon = 12 u , oxygen = 16 u ...
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