1. slide 1 Do Now Predict the radioactive decay pathway & product 1)potassium-36 p = 19, n = 17, n/p = 0.89 (too low), positron emission argon-36 2)fluorine-22 p = 9, n = 13, n/p = 1.44 (too high), beta decay neon-22 3)polonium-209 p = 84, n = 125, n/p = 1.49 (okay), Z > 83, alpha decay lead-205

2. slide 2 Do Now Predict the radioactive decay pathway & product 1)potassium-36 p = 19, n = 17, n/p = 0.89 (too low), positron emission argon-36 2)fluorine-22 p = 9, n = 13, n/p = 1.44 (too high), beta decay neon-22 3)polonium-209 p = 84, n = 125, n/p = 1.49 (okay), Z > 83, alpha decay lead-205

3. slide 3 Do Now Predict the radioactive decay pathway & product 1)potassium-36 p = 19, n = 17, n/p = 0.89 (too low), positron emission argon-36 2)fluorine-22 p = 9, n = 13, n/p = 1.44 (too high), beta decay neon-22 3)polonium-209 p = 84, n = 125, n/p = 1.49 (okay), Z > 83, alpha decay lead-205

4. slide 4 Do Now Predict the radioactive decay pathway & product 1)potassium-36 p = 19, n = 17, n/p = 0.89 (too low), positron emission argon-36 2)fluorine-22 p = 9, n = 13, n/p = 1.44 (too high), beta decay neon-22 3)polonium-209 p = 84, n = 125, n/p = 1.49 (okay), Z > 83, alpha decay lead-205

5. slide 5 Reminder (Honors) Writing on Nuclear Stability due tomorrow

6. slide 6 Balancing Nuclear Equations SWBAT balance nuclear equations and determine unspecified reactants or products Write this in your notes

7. slide 7 Nuclear Reactions & Equations Nuclear Reaction A reaction that involves a change to the nucleus of an atom Nuclear Equation A type of equation that shows the atomic number and mass number of the particles involved in a nuclear reaction Review

8. slide 8 Examples

9. slide 9 Atomic Notation for Radiation typesymbolemission atomic notation masscharge penetrating power alpha  He nucleus 4+2 low beta  electron ~0 ‒1‒1 medium gamma  photon 00 very high positron  ~0+1 low, but... Review

10. slide 10 Principles to Balancing Nuclear Equations  A reactants =  A products  Z reactants =  Z products Write this in your notes

11. slide 11 Decay Example  Z reactants = 94  Z products = 94  A reactants = 238  A products = 238 Write this in your notes

12. slide 12 Fission Example  Z products = 92  A products = 236  Z reactants = 92  A reactants = 236 Write this in your notes

13. slide 13 Fusion Example  Z products = 7  A products = 13  Z reactants = 7  A reactants = 13 Write this in your notes

14. slide 14 Check for Understanding Write the balanced nuclear equation for the decay of chlorine-38 into argon-38 and a beta particle.

15. slide 15 Check for Understanding Write the balanced nuclear equation for the decay of polonium-218 into astatine-218 and a beta particle.

16. slide 16 Check for Understanding Write the balanced nuclear equation for the decay of manganese-50 into chromium-50 and a positron

17. slide 17 Finding an Unknown 9 = Z + 1 18 = A + 0 When fluorine-18 undergoes radioactive decay, it produces a positron and another atom. Write a balanced nuclear equation which identifies the other atom. 18 = A X = O 8 = Z

18. slide 18 Finding an Unknown 6 = Z - 1 14 = A + 0 When carbon-14 undergoes radioactive decay, it produces a beta particle and another atom. Write a balanced nuclear equation which identifies the other atom. 14 = A X = N 7 = Z

19. slide 19 Do Now 1)Phosphorus-28 is radioactive. a)Identify the source(s) of instability b)Identify the decay pathway that will occur to fix this c)Write a balanced nuclear reaction for the decay d)Check to see if the source(s) of instability are fixed 2)Write the balanced nuclear equation for the decay of chlorine-38 into argon-38 and a beta particle. Nn even, Np evenNn odd, Np odd

20. slide 20 Typical Decay Problems The nuclear equation for a radioactive decay has the following components parent nuclide daughter nuclide radioactive particle(s) + Example: Nuclide - An atom or a group of atoms with the same number of protons and neutrons, and the same nuclear energy state. Similar but not identical meaning to isotopes.

21. slide 21 Typical Decay Problems Write this in your notes For a decay problem (not fission or fusion) There is only one reactant - the parent nuclide There is only one daughter nuclide There must be at least one radioactive particle, but there can be more than one The nuclear equation for a radioactive decay has the following components parent nuclide daughter nuclide radioactive particle(s) +

22. slide 22 In the typical decay problem, one of these components will be missing Read the problem carefully to make certain you know what is missing and needs to be found Typical Decay Problems The nuclear equation for a radioactive decay has the following components parent nuclide daughter nuclide radioactive particle(s) +

23. slide 23 "Beta decay of nobelium-259" Parent nuclide is nobelium-259 Radioactive particle is a beta particle (an electron) Daughter nuclide is unknown Typical Decay Problems The nuclear equation for a radioactive decay has the following components parent nuclide daughter nuclide radioactive particle(s) +

24. slide 24 Instead of: Can you write them the other way? ABSOLUTELY NOT!!! Even though it is balanced, the brown equation is not a decay reaction at all. Remember that decay means a parent breaks down spontaneously, that is without any trigger Could you write:

25. slide 25 "Alpha decay that produces curium-247" Daughter nuclide is curium-247 Radioactive particle is an alpha particle (He nucleus) Parent nuclide is unknown Typical Decay Problems The nuclear equation for a radioactive decay has the following components parent nuclide daughter nuclide radioactive particle(s) +

26. slide 26 "Decay of bismuth-210 to lead-210" Parent nuclide is bismuth-210 Daughter nuclide is lead-210 Radioactive particle is unknown Typical Decay Problems The nuclear equation for a radioactive decay has the following components parent nuclide daughter nuclide radioactive particle(s) +

27. slide 27 Worksheet Start in class Finish for homework Be sure to ask for help if you need it

28. slide 28 Radioactive Series A series of nuclear reactions that begins with an unstable nucleus and results in the formation of a stable nucleus is called a radioactive decay series.

29. slide 29 Potassium-36 is radioactive. a)Identify the source(s) of instability b)Identify the decay pathway that will occur to fix this c)Write a balanced nuclear equation which identifies the daughter atom produced by this decay d)Check to see if the source(s) of instability are fixed

30. slide 30 Potassium-36 N p : odd N n : odd N p : even N n : even Z < 83 positron emission

31. slide 31 Do Now 1)Phosphorus-28 is radioactive. a)Identify the source(s) of instability b)Identify the decay pathway that will occur to fix this c)Identify the nuclei produced by this decay d)Check to see if the source(s) of instability are fixed 2)Write the balanced nuclear equation for the decay of chlorine-38 into argon-38 and a beta particle. Nn odd, Np oddNn even, Np even

32. slide 32 Do Now 1)Phosphorus-28 is radioactive. a)Identify the source(s) of instability b)Identify the decay pathway that will occur to fix this c)Identify the nuclei produced by this decay d)Check to see if the source(s) of instability are fixed 2)Write the balanced nuclear equation for the decay of chlorine-38 into argon-38 and a beta particle. Nn even, Np evenNn odd, Np odd

33. slide 33 Do Now 1)Phosphorus-28 is radioactive. a)Identify the source(s) of instability b)Identify the decay pathway that will occur to fix this c)Identify the nuclei produced by this decay d)Check to see if the source(s) of instability are fixed Nn odd, Np oddNn even, Np even

34. slide 34 Do Now Fluorine-16 is radioactive. 1)Analyze all 3 factors of stability & determine which need to be changed 2)Predict decay pathway and product 3)Reanalyzed the 3 factors of stability to determine if they are now acceptable

35. slide 35 Do Now Fluorine-16 is radioactive. 1)Analyze all 3 factors of stability & determine which need to be changed 2)Predict decay pathway and product 3)Reanalyzed the 3 factors of stability to determine if they are now acceptable too low  N p : odd N n : odd  Z < 83

36. slide 36 Do Now Fluorine-16 is radioactive. 1)Analyze all 3 factors of stability & determine which need to be changed 2)Predict decay pathway and product 3)Reanalyzed the 3 factors of stability to determine if they are now acceptable too low  N p : odd N n : odd  Z < 83 ++

37. slide 37 Do Now Fluorine-16 is radioactive. 1)Analyze all 3 factors of stability & determine which need to be changed 2)Predict decay pathway and product 3)Reanalyzed the 3 factors of stability to determine if they are now acceptable too low  N p : odd N n : odd  Z < 83 N p : even N n : even Z < 83 ++