Krypton consists of several radioactive isotopes, some of which are listed in the following table. Isotope Half-life Kr-73 27 s Kr-74 11.5 min Kr-76 14.8 h Kr-81 2.1 x 105 yr Which of these isotopes is most stable and which isotope is "hottest"? is the most stable because it has the How long does it take for 87.5% of each isotope to decay? Kr-73 Kr-74 Kr-76 Kr-81 S min h yr half-life, whereas is the hottest (least stable) since it has the

Krypton consists of several radioactive isotopes, some of which are listed in the following table. Isotope Half-life Kr-73 27 s Kr-74 11.5 min Kr-76 14.8 h Kr-81 2.1 x 105 yr Which of these isotopes is most stable and which isotope is "hottest"? is the most stable because it has the How long does it take for 87.5% of each isotope to decay? Kr-73 Kr-74 Kr-76 Kr-81 S min h yr half-life, whereas is the hottest (least stable) since it has the

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Chapter19: Radioactivity And Nuclear Energy

Section: Chapter Questions

Problem 11A

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2.86 For some uses, the relative abundance of isotopes must be manipulated. For example, a medical technique called boron neutron capture therapy needs a higher fraction of 10B than occurs naturally to achieve its best efficiency. What would happen to the atomic weight of a sample of boron that had been enriched in 10B? Explain your answer in terms of the concept of a weighted average.
For the following isotopes that have missing information, fill in the missing information to complete the notation (a) X1434 (b) PX36 (c) MX57n (d) X56121
Fill in the following table:
For each pair of elements listed, predict which one has more stable isotopes. (a) Ni or Cu (b) Se or Sb (c) Cd or Au