Question

Your TCC ID number 4 random τ| 20 | 15 | 51 | 16 | LL | 2L To find your value for the Atomie Number: sum the 3 values A, B, and C. If the result is a two-digit number, sum all those digits together, and repeat again and again if necessary. Your final value should be a digit 1-9. Add this value to 90 and use that result for the atomic number of your starting nuclide. To find your value for the Mass Number: sum the 3 values D, E, and F. If the result is 30 or more, then subtract 30 and repeat until the result less than 30. If the value is an odd number then add 1. If the vale is zero or if it is divisible by 4 then add 2 Add this value to 230 and use that resalt for the mass number of your starting maclide You are going to walk through a nuclear decay series for an atom of your nuclide that decays sequentially all the way down B Lead-208. The goal is to predict which radioisotopes should make an appearance and which types of radiation are emitted along the way, all the time staying as near the Bet of Stability as possible. Use the table on the following page to map out your decay series. Begin by highlighting the boxes that correspond to the isotopes listed on the Periodic Table- these represent the Belt of Stability and show the path you should endeavor to stay as close to as possibke. (Decay series are known to have multiple branched paths, so do not despair if your decay series doesn't look exactly like a sample found online.) You are limited to three types of radiation for this exercise: alphs, beta, and positros emission. Consider bow each type of decay affects the mass number and atomic number, and use that information to plan out your decay series Bring to class on the day of the final: 1. Your graph showing the plan for your decay series. Highlight the isotopes that represent the Belt of Stability (based on their averages masses listed on the a. Periodic Table or from another source). b. Mark the box representing your starting muclide c. Mark each radioisotope that is produced during each step in your series. d. Label the type of radiation emitted duaring each nuclear transiticn 2. Report the total number each of a, B, and p' particles emitted cta: Alpha: 212 210 208

Answer 1

Sum of A, B, C is (20 + 15 + 59) = 94 sum of two digits (9 + 4) = 13 Again of two digits (1 + 3) = 4 so, atomic number = (90 + 4) = 94 sum of D, E, F is (16 + 11 + 21) = 48 This is more than 30 so, (48 - 30) = 18 (18 is an even no. and not divisible by 4) so no addition of 2. So, mass no. = (230 + 18) = 248 now plutonium has atomic number 94. But mass number 242. So the unstable nuclide will undergo decay to stabilize itself. Alpha emission rightarrow reduces atomic no. by 2 reduces mass no. by 4 beta^- emission rightarrow Mass no. unchanged atomic no increases by 1 beta^+ emission rightarrow Mass no. unchanged atomic no. decreases by 1 This radioactive decay series comes under 4_n- series i.e Thorium series starting from n = 62 mass no.248 ending n = 52, mass no.208