Sodium (Na)

http://www.chemsoc.org/VISELEMENTS/pages/data/sodium_data.html

http://education.jlab.org/itselemental/ele011.html

http://www.mii.org/periodic/LifeElement.php

http://www.lenntech.com/Periodic-chart-elements/Na-en.htm

http://www.americanelements.com/na.html

http://periodic.lanl.gov/elements/11.html

http://pol.spurious.biz/projects/chemglobe/ptoe/_/11.html

 

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