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Chapter 4: Q. 4.40 (page 115)

Two isotopes of rubidium occur naturally, R3785bandR3787b. Which isotope of rubidium is more abundant?

Short Answer

Expert verified

The isotope of rubidium which is more abundant isR3785b.

Step by step solution

01

Given information

We need to find that out of R3785band R3787bwhich is more abundant.

02

Explanation

The atomic mass of an element on the periodic table is used to find the most abundant isotope. The atomic mass of rubidium is 85.468amu, as can be shown. Although no rubidium atom has that mass, it is the average mass of a rubidium sample.

When comparing the atomic masses of R3785band R3787b, we can see that the atomic mass number on the periodic table is closer to that of R3785b.

We can deduce that R3785bis more plentiful.

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