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You have a chunk of radioactive iron with a mass number of 55 (Fe-55)

Chemistry

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You have a chunk of radioactive iron with a mass number of 55 (Fe-55). This isotope has a half life of about 2.5 years. Use this information to approach the next two questions.
a. This chunk of material is decaying by electron capture. What is the product of this decay?

b. What % of this sample will remain after 5 years.