why the mass number and atomic mass are almost equal for atoms having – InterviewSolution

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1.	why the mass number and atomic mass are almost equal for atoms having lighter nuclei?for eg- nitrogen,aluminium,magnesium,oxygen have equal mass number and atomic mass while this is not the case in iron?
Answer» why the mass number and atomic mass are almost equal for atoms having lighter nuclei?for eg- nitrogen,aluminium,magnesium,oxygen have equal mass number and atomic mass while this is not the case in iron?

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