Use the Chart of the Nuclides to compare the absorption cross-sections (thermal is listed first in barns) of these elements (not isotopes) with the fission cross-section of U. Rank them in order from smallest to largest. 

Use the Chart of the Nuclides to compare the absorption cross-sections (thermal is listed first in barns) of these elements (not isotopes) with the fission cross-section of U. Rank them in order from smallest to largest.     for this assignment, and be careful to use reputable web resources. Format your references section according to a standard of your choosing (You may want to consider finding a citation editor, e.g. Mendeley, Zotero, Endnote, etc. and sticking with it throughout college)