Chapter 11: Q15E (page 518)

From the abundances and atomic masses given in Appendix I of the two naturally occurring isotopes of boron. Determine the average atomic mass of natural boron. Compare this with the value given in the periodic table of Chapter 8.

Short Answer

Expert verified

Atomic mass and average mass of boron both are equal to $10.811 u$ .

Step by step solution

Given data

Two major naturally occurring isotopes of boron are given as:

Atomic mass of boron-, $10$ . $m_{B - 10} = 10.012937 u$

Atomic mass of boron-, $11$ . $m_{B - 11} = 11.009305 u$

$%$ Natural abundance boron- $10$ is $19.9 %$ .

$%$ Natural abundance boron- $11$ is $80.1 %$ .

Atomic mass of boron in periodic table, $m_{B} = 10.811 u$ .

Concept of Isotopes

Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.

Comparison of atomic mass and average mass of boron

The average atomic mass of boron is given as:

$\begin{array}{l} m_{average} = m_{B - 10} \times 19.9 % + m_{B - 11} \times 80.1 % \\ m_{average} = (10.012937 u) \times 19.9 % + (11.009305 u) \times 80.1 % \\ m_{average} = 10.811 u \end{array}$

Since, the atomic mass of boron in periodic table, $m_{B} = 10.811 u$ .

On comparing the atomic mass and average mass of boron, one can say that both are equal to . $m_{B} = 10.811 u$

Unlock Step-by-Step Solutions & Ace Your Exams!

Full Textbook Solutions
Get detailed explanations and key concepts
Unlimited Al creation
Al flashcards, explanations, exams and more...
Ads-free access
To over 500 millions flashcards
Money-back guarantee
We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

Recommended explanations on Physics Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

From the abundances and atomic masses given in Appendix I of the two naturally occurring isotopes of boron. Determine the average atomic mass of natural boron. Compare this with the value given in the periodic table of Chapter 8.

Short Answer

Step by step solution

Given data

Concept of Isotopes

Comparison of atomic mass and average mass of boron

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Energy Physics

Electric Charge Field and Potential

Medical Physics

Work Energy and Power

Wave Optics

Nuclear Physics

Study anywhere. Anytime. Across all devices.