1. Nucleus decay

2. How do you write equations with different types of nuclear decay? It all depends on the type of decay. The symbols should represent what happens to the nucleus. Alpha Beta Gamma Electron capture Positron emission

3. Draw the formula for the following radioactive decays. Polonium-210 goes through alpha decay. Carbon-14 goes through beta decay. Carbon-11 goes through positron emission. Rubidium-81 goes through electron capture.

4. How can half life be used to determine amount of material? N = N 0 (1/2) n N = remaining amount N 0 = original amount n = number of half lives n can be replaced with t/T where t = elapsed time and T = half life

5. Using the half life equation, how much is remaining of a 100.0 g sample of Krypton-85 after 33 years if the half life is 11 years? How many half lives have passed? What does the equation look like? N = 100.0 (1/2) 3 N = 12.50 grams

6. The half life of polonium-218 is 3.0 minutes. How long before a 20.0 g sample would decay to 1.00 grams? What equation should we use? How can you solve for an exponent? 13 minutes.

7. What is mass defect? The difference in mass between individual nucleons and the mass of the nucleus. This difference in mass is equal to the energy released when it is brought together. This binding energy is what holds the nucleus together.

8. How can we use E = mc 2 to find the binding energy of an atom? Mass defect is the mass of the isotope minus the mass of the added nucleons. Proton = 1.007825 amu Neutron = 1.008665 amu 1 amu = 1.660540 x 10 -27 kg c = 3.00 x 10 8 m/s

9. What is the mass defect and binding energy of lithium 7 if its accepted mass is 7.016003 amu? What is in the nucleus? What should the mass be? -0.042132 amu -6.99 x 10 -29 kg 6.29 x 10 -12 joules

10. What are the uses of radiation? Fission and fusion (theoretical) energy reactors. Radioactive isotope tracers. Treatment of cancer. PET scans.