12. Thorium-232 undergoes a series of alpha and beta decays to become the stable nucleus Lead-208. Create a decay series graph as in question #11, indicating all alpha and beta decays. 238 Starting with Th-232, complete the following 10 decays in order: 234 it decay. 230 +B decay a-B-B- a--a--a-a--B-B--al 226 222 Mass number, A 218 214 210 206 82 83 84 85 86 87 88 89 90 91 92 Pb Bi Po At An Fr Ra Ac Th Pa U Number of protons, Z