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   Na (sodium)
   Na (sodium): Na is the chemical symbol for sodium. From natrium, a synonym for sodium. Sodium is the major positive ion (cation) in fluid outside of cells. The chemical notation for sodium is Na<SUP>+</SUP>. When combined with chloride (Cl), the resulting substance is table salt (NaCl). ...
   Found op http://www.medterms.com/script/main/art.html?articlekey=4496
   
   

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