1. ICP 9/25/12 Nuclear Decay Equations

2. Warmup 1)What composes an alpha particle? 2)What composes a beta particle? 3)What is gamma radiation?

3. Agenda Finish Notes (Alpha/Beta Examples) Worksheet (Balancing Nuclear Equations Practice) Homework: Finish “Balancing Nuclear Equations Practice”

4. X A Z Y A - 4 Z - 2 + He 4 2 Alpha Decay (Don’t Copy) unstable atom more stable atom alpha particle

5. Alpha Decay (Don’t Copy) Ra 226 88 Rn 222 86 He 4 2

6. X A Z Y A - 4 Z - 2 + He 4 2 Ra 226 88 Rn 222 86 + He 4 2 Alpha Decay General Format Example A

7. Rn 222 86 He 4 2 + Po 218 84 He 4 2 Rn 222 86 + ___ He 4 2 Alpha Decay Example B Example B

8. He 4 2 U 234 92 + Th 230 90 He 4 2 ___ + Th 230 90 He 4 2 Alpha Decay Example C Example C

9. Th 230 90 + ___ He 4 2 Alpha Decay He 4 2 + Ra 226 88 He 4 2 Th 230 90 Example D Example D

10. ___ + Pb 214 82 He 4 2 Alpha Decay He 4 2 + Pb 214 82 He 4 2 Po 218 84 Example E Example E

11. Beta Decay A beta particle is a fast moving electron which is emitted from the nucleus of an atom undergoing radioactive decay. Beta decay occurs when a neutron changes into a proton and an electron.

12. Beta Decay As a result of beta decay, the nucleus has one less neutron, but one extra proton. The atomic number, Z, increases by 1 and the mass number, A, stays the same.

13. Beta Decay Po 218 84 e 0 At 218 85

14. X A Z Y A Z + 1 + e 0 Beta Decay Po 218 84 Rn 218 85 + e 0 General Format Example A

15. Th 234 90 ____ + e 0 Beta Decay Th 234 90 Pa 234 91 + e 0 Example B Example B

16. ___ Pb 210 82 + e 0 Beta Decay Tl 210 81 Pb 210 82 + e 0 Example C Example C

17. Bi 210 83 ___ + e 0 Beta Decay Bi 210 83 Po 210 84 + e 0 Example D Example D

18. ___ Bi 214 83 + e 0 Beta Decay Pb 214 82 Bi 214 83 + e 0 Example E Example E