state the importance of valence electrons in the organizatin of the periodic table
Since this is not my area of expertise, I searched Google under the key words "'valence electrons' periodic table" to get these possible sources:
http://web.jjay.cuny.edu/~acarpi/NSC/4-pertab.htm
http://www.visionlearning.com/library/module_viewer.php?mid=52
http://www.cem.msu.edu/~reusch/VirtualText/intro2.htm
http://antoine.frostburg.edu/chem/senese/101/periodic/
(Broken Link Removed)
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.