At Westonci.ca, we make it easy for you to get the answers you need from a community of knowledgeable individuals. Get detailed and accurate answers to your questions from a community of experts on our comprehensive Q&A platform. Connect with a community of professionals ready to help you find accurate solutions to your questions quickly and efficiently.

PLEASE please define and explain how and why the SHIELDING EFFECT trends the way that it does DOWN THE PERIODIC TABLE (groups)