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Solved: Determine the number of protons and neutrons in each isotope.(a) (b) (c) (d)

Chapter 4, Problem 97P

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QUESTION:

Rubidium has two naturally occurring isotopes: Rb-85 with mass 84.9118 amu and a natural abundance of \(72.17%\), and Rb-87 with mass 86.9092 amu and a natural abundance of \(27.83%\). Calculate the atomic mass of rubidium.

Equation Transcription:

Text Transcription:

72.17%

27.83%

Questions & Answers

QUESTION:

Rubidium has two naturally occurring isotopes: Rb-85 with mass 84.9118 amu and a natural abundance of \(72.17%\), and Rb-87 with mass 86.9092 amu and a natural abundance of \(27.83%\). Calculate the atomic mass of rubidium.

Equation Transcription:

Text Transcription:

72.17%

27.83%

ANSWER:

Solution 97P

Step 1:

The isotopes of the same element have similar chemical behavior.

(a) In 1123Na the atomic number is 11, so there are 11 protons and 11 electrons. The mass  number     is 23, so there are 12 (=23-11) neutrons.

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