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The element rubidium comprises two naturally occurring isotopes with mass numbers 85 and 87. the atomic mass of the element is 85.47 amu. from the atomic mass deduce which isotope is more abundant. calculate the isotope distribution of Rb

Oct 18th, 2017

The observed  mass depends on the proportion of each isotope present. If they were present in equal proportion atomic mass would be (85+87)/2 =86

Since the atomic mass is only 85.47 more of the lighter isotope is present.

Hence rubidium 85 is more abundant.

Sep 15th, 2014

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