Read: http://www.bcscience9.com/ebook/ebook_docs/BC9TEXTCH01_Sec3.pdf
Do:http://www.bcscience9.com/ebook/ebook_docs/BC9WBCH01_Sec3.pdf (Only pages 15-17)
Complete: Bohr Model Diagram Template-1jxce3d (The first 20 elements)
Find: Electron Arrangements in the First 20 Elements-2eu0u6q