Pictures And Video Souces
http://www.youtube.com/watch?v=W9PvrmDgoME
http://www.youtube.com/watch?v=92Mfric7JUc
http://www.Perodictable.com
http://en.m.wikibooks.org/wiki/File:Lewis_dot_Na.svg
http://www.teacherfurse.com
*Some of the picture came from the same website *
http://www.youtube.com/watch?v=92Mfric7JUc
http://www.Perodictable.com
http://en.m.wikibooks.org/wiki/File:Lewis_dot_Na.svg
http://www.teacherfurse.com
*Some of the picture came from the same website *