Printhttp://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descriptive_Chemistry/Pe...
http://en.wikipedia.org/wiki/Periodic_trends
https://www.chem.tamu.edu/class/majors/tutorialnotefiles/trends.htm
https://www.khanacademy.org/science/chemistry/atomic-structure-and-prope...
http://chemistry.about.com/od/periodictableelements/a/periodictrends.htm
http://edtech2.boisestate.edu/lindabennett1/502/Periodic%20Table%20e%20c...
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