1. Types of Radiation 10/1/15

2. Brain Teaser Soft and fragile is my skin I get my growth in mud I’m dangerous on something pretty If you’re not careful, I draw blood.

3. Objectives Practice identifying nuclear reactions by type of radiation. Characterize alpha, beta, and gamma radiation in terms of mass and charge.

4. Recall from yesterday Isotopes are radioactive when their nucleus is unstable. Instability is determined by the ratio of neutrons to protons. When radioactive isotopes release radiation to become stable, they undergo nuclear reactions (changes to the nucleus of the atom).

5. Types of radiation Scientists directed radiation from a radioactive source between 2 electrically charged plates

6. Types of Radiation In the experiment, radiation was deflected: toward the negatively charged plate = Alpha toward the positively charged plate = Beta Have to have more protons to get a positive charge, right? Have to have more electrons to get a negative charge, right?

7. Gamma rays – are high energy radiation that accompany alpha and beta radiation with no deflection (no electrical charge and no mass).

8. Alpha particle During alpha decay an alpha particle is emitted.

9. Alpha radiation

10. Symbol of an alpha particle

11. Nuclear equation 222+4 = 226 Mass is CONSERVED! 86 + 2 = 88 Mass is CONSERVED! 234 + 4 = 238 90 + 2 = 92 Mass is CONSERVED!

12. Alpha decay ? 238 – 4 = 234 92 – 2 = 90 Look at periodic table

13. Beta particle During beta decay a beta particle is emitted. electron

14. Beta radiation

15. Symbol of a beta particle

16. Beta Radiation

17. ? 234 – 0 = 234 90 – (-1) = 90 + 1 = 91 Look at periodic table

18. Gamma Rays

21. Only emitting gamma radiation doesn’t change the mass of the atom

22. Types of radiation

23. Gamma Ray Nuclear Equation

24. ? 202 – 0 = 202 81 – 0 = 81 Has anything changed?

25. Types of radiation

27. What type of radiation? Gamma Radiation

28. What type of radiation? Beta Radiation

29. What type of radiation? Alpha Radiation

30. ? ? ? ? ? ?

31. Section 4.4 Assessment Complete the section assessment on page 107 # 23-27 Work in pairs