is there any difference between mass number andatomic weight?

Asked by sonu verma | 25th Feb, 2011, 12:00: AM

Expert Answer:

Dear student,
Mass number is the mass of a particular isotope of an element relative to hydrogen-1. Atomic weight or more correctly atomic mass is a weighted mean of the masses of the naturally occurring isotopes. So for chlorine for example there are isotopes withmass numbers 35 & 37 and at their natural abundance the atomic mass of Cl comes out at about 35.5
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Answered by  | 26th Feb, 2011, 07:47: AM

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