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- 1. Unit 17Radioactive Decay<br />
- 2. Unstable Atoms<br />When the repulsive forces of the protons exceeds the ability of the strong nuclear force to hold them together, they are unstable.<br />In addition, sometimes nuclei are too heavy and have too many neutrons to remain together<br />
- 3. Three Types of Radiation<br />Alpha Particles- 2 protons and 2 neutrons<br />Beta Particles- electron<br />Gamma Rays- Tiny electromagnetic waves<br />
- 4. Alpha Particles<br />* Represented by α (alpha)<br />* They are equivalent to the nuclei of a He atom<br />* (+2) Charge, heavy and slow moving<br />*Limited penetrating power, stopped by sheet of paper<br />
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- 10. Alpha Particles<br />* Represented by α (alpha)<br />* They are equivalent to the nuclei of a He atom<br />* (+2) Charge, heavy and slow moving<br />*Limited penetrating power, stopped by sheet of paper<br />Equation Example:<br />
- 11. Conversion From One Element to Another Through Alpha Decay<br />
- 12. Dangers of Radon Gas<br />
- 13. Radioactive Decay Series<br />
- 14. Radioactive Decay Series<br />
- 15. Radioactive Decay Series<br />
- 16. Radioactive Decay Series<br />
- 17. Radioactive Decay Series<br />
- 18. Beta Particles<br />Represented by β (beta)<br />(-) Charge, little mass, 100x faster than alpha<br />Basically high-speed electrons<br />Stopped by Aluminum Sheet.<br />Changes a Neutron into a Proton<br />
- 19. Beta Particles<br />Equation Example:<br />
- 20. Beta Decay Series<br />
- 21. Beta Decay Series<br />
- 22. Beta Decay Series<br />
- 23. Beta Decay Series<br />While it may seem it is cycling around, the difference is it keeps losing mass, thus it turns from Ra-228 to Ra-224<br />
- 24. Gamma Particles<br />Represented by ɣ (gamma)<br />Electromagnetic wave, no charge (neutral) or mass<br />Great speed, high-energy, very dangerous<br />High penetrating power<br />Only lead can stop them<br />
- 25. Radioactivity<br />Alpha, Beta and Gamma Particles<br />
- 26.
- 27. Half-Life<br />Half-life is a measure of the rate of decay of a radioactive element. <br />It is the time it takes for half of the atoms to decay.<br />Carbon-14 has a half life of 5730 years<br />
- 28. Carbon-14 Dating<br />
- 29.
- 30. The lack of certain elements on Earth is related to their very short half-lives<br />

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