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You have a chunk of radioactive iron with a mass number of 55 (Fe-55)
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.
Expert Solution
Answer:
In electron capture an neutron is emitted and one proton converts into neutron
So that
Mass number stays the same but atomic number becomes less by one
So
55-Fe becomes 55-Mn
(Mn is manganese atomic number 25 and Fe has atomic number 26
Question 2
As half life is 2.5 years
So in 5 years it will complete 2 half lives
So
100% - 50 % in one half life
50% -25 % in second half life
So remaining sample is 25 %
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