The mass spectrographic measurements of an element X whose atomic number is 31 indicated peaks at 79.21, 11.2, and 9.59. The isotopic masses are 69, 70, and 71 atomic mass unit (a.m.u.) respectively
Question
i) Write the conventional symbols for the three isotopes
ii) Calculate the relative atomic mass of X
iii) Explain why atomic weights of elements are not whole numbers
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