1. Section 2: Radioactive Decay K What I Know W What I Want to Find Out L What I Learned

2. Radioactive Decay Copyright © McGraw-Hill Education

3. Radioactive Decay Copyright © McGraw-Hill Education

4. New transmutation nucleon strong nuclear force band of stability positron emission positron electron capture radioactive decay series half-life radiochemical dating Radioactive Decay Copyright © McGraw-Hill Education Vocabulary

5. Radioactive Decay Copyright © McGraw-Hill Education

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12. Interactive Table FPO Add link to Interactive Table from page 868 here. Radioactive Decay Copyright © McGraw-Hill Education

13. Radioactive Decay Copyright © McGraw-Hill Education

14. Radioactive Decay Copyright © McGraw-Hill Education BALANCING A NUCLEAR EQUATION EVALUATE THE ANSWER The correct formula for an alpha particle is used. The sums of the superscripts and subscripts on each side of the equation are equal. Therefore, the charge and the mass number are conserved. The nuclear equation is balanced. Response ANALYZE THE PROBLEM You are given that a plutonium atom undergoes alpha decay and forms an unknown product. Plutonium-238 is the initial reactant, while the alpha particle is one of the products of the reaction. KNOWN UNKNOWN mass number of the product A = ? atomic number of the product Z = ? reaction product X = ?

15. Radioactive Decay Copyright © McGraw-Hill Education

16. Radioactive Decay Copyright © McGraw-Hill Education N is the remaining amount. N 0 is the initial amount. n is the number of half-lives that have passed. t is the elapsed time and T is the duration of the half-life.

17. Radioactive Decay Copyright © McGraw-Hill Education

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19. Radioactive Decay Copyright © McGraw-Hill Education CALCULATING THE AMOUNT OF REMAINING ISOTOPE Use with Example Problem 2. Problem Krypton-85 is used in indicator lights of appliances. The half-life of krypton-85 is 11 y. How much of a 2.000-mg sample remains after 33 y? Response ANALYZE THE PROBLEM You are given a known mass of a radioisotope with a known half-life. You must first determine the number of half-lives that passed during the 33-year period. Then, use the exponential decay equation to calculate the amount of the sample remaining. KNOWN Initial amount = 2.000 mg Elapsed time (t) = 33 y Half-life (T ) = 11 y UNKNOWN Amount remaining = ? mg

20. Radioactive Decay Copyright © McGraw-Hill Education CALCULATING THE AMOUNT OF REMAINING ISOTOPE

21. Radioactive Decay Copyright © McGraw-Hill Education transmutation nucleon strong nuclear force band of stability positron emission positron electron capture radioactive decay series half-life radiochemical dating