A certain element ex has isotopes with mass numbers of 10 and 11 the Exton isotope has an atomic mass of 10.013 and it represents 19. 9% of all Adams of this element the actual 11 isotope has atomic mass of 11.009 and it represents 80.1% of all items of this element therefore the average atomic mass or atomic weight of this element is
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A certain element ex has isotopes with mass numbers of 10 and 11 the Exton isotope has an atomic mas...
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