You can use these mass defects to see whethercertain decays are energetically favorable(energetically favorable, however, does notnecessarily imply that it will happen any time soon!)For example, as an exercise, consider the negatrondecay of Re to Os.187.187Show that this decay is energetically favorable (themass of the electron is negligible)By showing that this decay is favorable, you are alsoshowing that the reverse is not favorable, that is,187Os will not positron decay toRe.187

The mass defect of a nucleus is the difference between its actual mass & its expected mass based…

You can use these mass defects to see whether certain decays are energetically favorable (energetically favorable, however, does not necessarily imply that it will happen any time soon!) For example, as an exercise, consider the negatron decay of Re to 187. 187 Os. Show that this decay is energetically favorable (the mass of the electron is negligible) By showing that this decay is favorable, you are also showing that the reverse is not favorable, that is, 187 Os will not positron decay to Re. 187

You can use these mass defects to see whether certain decays are energetically favorable (energetically favorable, however, does not necessarily imply that it will happen any time soon!) For example, as an exercise, consider the negatron decay of Re to 187. 187 Os. Show that this decay is energetically favorable (the mass of the electron is negligible) By showing that this decay is favorable, you are also showing that the reverse is not favorable, that is, 187 Os will not positron decay to Re. 187

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter18: The Nucleus: A Chemist's View

Section: Chapter Questions

Problem 1Q

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9-39 If you work in a lab containing radioisotopes emitting all kinds of radiation, from which emission should you seek the most protection?
Determine the value of R for deuterium (2H) and tritium (3H) using equation 15.3. You will have to look up the masses of the D and T nuclei. By what percentage do these R values differ from that for hydrogen?
What is... a) the aproximate size of the nucleus b) groundstate
(a) On the basis of nuclear shell model, arrange the nucleons in various shells/orbits and obtain the spectroscopic notation of a nucleus with 20 nucleons for l= 2. (b) decavs the m cta C. e allo tum 7. parity P an! reuS T Spe vid gar
15. Use the semiempirical mass formula to obtain an expression for the two-neutron separation energy when A » 1. (Hint: A differential method is far easier than an algebraic one for this problem.) Estimate the size of the various terms and discuss the A dependence. Compare with the following data for Al and Te: 124 Te 16.36 MeV 125 Te 16.00 MeV 126 Te 15.69 MeV 127 Te 15.41 MeV 128 Te 15.07 MeV 129 Te 14.86 MeV 25A1 31.82 MeV 117Te 18.89 MeV 118Te 18.45 MeV 26A1 28.30 MeV 27ΑΙ 24.42 MeV 119Te 18.17 MeV 28A1 20.78 MeV 120 Te 17.88 MeV 29A1 17.16 MeV 121 Te 17.46 MeV 122 Te 17.04 MeV 30AI 15.19 MeV 3ΙΑΙ 13.03 MeV 123 Te 16.80 MeV 130 Te 14.50 MeV Why do we choose two-neutron, rather than one-neutron, separation en- ergies for this comparison?
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8:34 PM Wed Dec 2 100% AA sjc.cengagenow.com Yahoo Mail Home - sier... Chapter 10 S... OWLV2 | Onli... Mail - Ike Ray... C Search All M... b My Question... SIERRA Module 11-12 [Review Topics] [References] 1. Nuclear Fission 1 pts 2req Use the References to access important values if needed for this question. Complete the following nuclear bombardment equation by filling in the nuclear symbol for the missing species. 2. Nuclear Fusion 1 pts 2req Question Question Visited + He →0 + H 8 Question 3. Decay vs. Bombardment Reactions 1 pts 2req Submit Answer Retry Entire Group 9 more group attempts remaining Progress: 0/3 groups Due Dec 4 at 11:55 PM Previous Next Finish Assignment Save and Exit
As the attractive force of a nucleus on electrons increases, the size of an atom... O Increases O Decreases O Stays the same
8:33 PM Wed Dec 2 100% AA sjc.cengagenow.com Yahoo Mail Home - sierr... Chapter 10 S.. OWLV2 | Onli... Mail - Ike Ray... C Search AILM... b My Question... SIERRA Module 11-12 [Review Topics] [References] 1. Nuclear Fission 1 pts 2req Use the References to access important values if needed for this question. Question Question Complete the following nuclear bombardment equation by filling in the nuclear symbol for the missing species. Question 2. Nuclear Fusion 1 pts 2req 3. Decay vs. Bombardment Reactions 1 pts 2req 235U + on 139Xe + 3 on > + 54 Submit Answer Retry Entire Group 9 more group attempts remaining Progress: 0/3 groups Due Dec 4 at 11:55 PM Previous Next Finish Assignment Save and Exit

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