11. For each of the elements below, there are only two naturally occurring isoto

Question

11. For each of the elements below, there are only two naturally occurring isotopes. Using the average atomic masses on the periodic table, identify the pair in which the heavier isotope is the more abundant one. 63Cu and 6SCu 8Rb and 7Rb 0B and B 79Br and 8'Br e. IN and N 12. For each of the element Using the atomic masses on the periodic table, identify the pair in which the lighter isotope is the more abundant one. a. Li and 'Li b. 7Br and 8'Br c. 10B and "B s below, there are only two naturally occurring isotopes. eLi and i3r d. 121Sb and 123Sb e. 50V and slv Scanned by C

Explanation / Answer

Ans 11 : e) 10B and 11B

The atomic mass of the element is the sum of the isotopic masses each multiplied with their natural abundances.

So if the heavier isotope is abundant , the atomic mass of the element will be closer to it.

Here the atomic mass of element is 10.811 u , which is closer to its heavier isotope 11B.

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