Answered: a) How many protons does Promethium-145…

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter2: Atoms Molecules And Ions

Section: Chapter Questions

Problem 8PS: Atomic structure. (a) The synthetic radioactive element technetium is used in many medical studies....

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Promethium is the only rare-earth metal of the lanthanide series of the periodic table not found in nature on Earth and all of the isotopes are radioactive. A little promethium is used in specialized atomic batteries. These are roughly the size of a drawing pin and are used for pacemakers, guided missiles and radios. The radioactive decay of promethium is used to make a phosphor give off light and this light is converted into electricity by a solar cell. a) How many protons does Promethium-145 have? b). How many neutrons does Promethium-145 have? Promethium-145 has a half-life of 17.7 years. If there are initially 10 grams in a sample of Promethium-145. c) How long will it take to decay to 2.5 g? d) To the nearest hundredth of a gram how much of the original remains after three half-lives have elapsed?

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