Biology, 29.05.2020 08:59, completed7

A certain element (X) has isotopes with mass numbers of 10 and 11. The X-10 isotope has an atomic mass of 10.013, and it represents 19.9% of all atoms of this element. The X-11 isotope has an atomic mass of 11.009, and it represents 80.1% of all atoms of this element. Therefore, the average atomic mass, or atomic weight, of this element is amu.

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A certain element (X) has isotopes with mass numbers of 10 and 11. The X-10 isotope has an atomic ma...