p43_008 - modes of decay, etc are available at the last two...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
8. The problem with Web-based services is that there are no guarantees of accuracy or that the webpage addresses will not change from the time this solution is written to the time someone reads this. Still, it is worth mentioning that a very accessible website for a wide variety of periodic table and isotope-related information is http: // www . webelements . com. Two websites aimed more towards the nuclear professional are http: // nucleardata . nuclear . lu . se / nucleardata and http: // www . nndc . bnl . gov / nndc / ensdf, which are where some of the information mentioned below was obtained. (a) According to Appendix F, the atomic number 60 corresponds to the element Neodymium (Nd). The ±rst website mentioned above gives 142 Nd, 143 Nd, 144 Nd, 145 Nd, 146 Nd, 148 Nd, and 150 Nd in its list of naturally occurring isotopes. Two of these, 144 Nd and 150 Nd, are not perfectly stable, but their half-lives are much longer than the age of the universe (detailed information on their half-lives,
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: modes of decay, etc are available at the last two websites referred to, above). (b) In this list, we are asked to put the nuclides which contain 60 neutrons and which are recognized to exist but not stable nuclei (this is why, for example, 108 Cd is not included here). Although the problem does not ask for it, we include the half-lives of the nuclides in our list, though it must be admitted that not all reference sources agree on those values (we picked the ones we regarded as most reliable). Thus, we have 97 Rb (0.2 s), 98 Sr (0.7 s), 99 Y (2 s), 100 Zr (7 s), 101 Nb (7 s), 102 Mo (11 minutes), 103 Tc (54 s), 105 Rh (35 hours), 109 In (4 hours), 110 Sn (4 hours), 111 Sb (75 s), 112 Te (2 minutes), 113 I (7 s), 114 Xe (10 s), 115 Cs (1.4 s), and 116 Ba (1.4 s). (c) We would include in this list: 60 Zn, 60 Cu, 60 Ni, 60 Co, 60 Fe, 60 Mn, 60 Cr, and 60 V....
View Full Document

Ask a homework question - tutors are online