I. Write the alpha-decay rxn for Cf-246. 2. What nuclide undergoes alpha decay to form Pb-206? 3. Write the beta-decay rxn for Cf-255. 4. What nuclide undergoes beta-decay to form W-183? 5. Sn-111 undergoes positron emission, write the rxn for it 6. What nuclide undergoes positron-emission to form N-15? 7. Write the electron-capture rxn for TI-199. 8. What nuclide undergoes electron-capture to form Au-201 (thinking of getting rich)? 9. If we start with 1.000 g Sr-90, 0953g remains after 2 years. A) Find the half-life for Sr-90, and b) how much Sr-90 remains after 5 years?.