http://www.flashcardexchange.com/tag/chemtrends www.flashcardexchange.com: chemtrends Flashcards en-us Sun, 27 May 2012 08:10:41 PDT Sun, 27 May 2012 08:10:41 PDT support@flashcardexchange.com 720 http://www.flashcardexchange.com/flashcards/view/762946 Periodic Table trends for chemistry students: electronegativity, ionization energy, atomic & ionic radius, shielding effect. 2009-03-01 http://www.flashcardexchange.com/flashcards/view/762946