All the stable isotopes of boron, carbon, nitrogen,
Chapter , Problem 21.7(choose chapter or problem)
All the stable isotopes of boron, carbon, nitrogen, oxygen, and fluorine are shown in the accompanying chart (in red), along with their radioactive isotopes with t1>2 7 1 min (in blue). (a) Write the chemical symbols, including mass and atomic numbers, for all of the stable isotopes. (b) Which radioactive isotopes are most likely to decay by beta emission? (c) Some of the isotopes shown are used in positron emission tomography. Which ones would you expect to be most useful for this application? (d) Which isotope would decay to 12.5% of its original concentration after 1 hour? [Sections 21.2, 21.4, and 21.5] 5700 yr 110 min 2 min 71 s 10 min 20 min 5 6 7 8 9 5 6 7 8 9 10 Number of protons
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