Bailey-Melton,+Ka

= __Sodium__ =

__ **Properties:** __

 Atomic number:  11 Atomic mass: 22.98977 g.mol -1 Electronegativity according to Pauling:  0.9 Density: 0.97 g.cm -3 at 20 °C Melting point: 97.5 °C Boiling point: 883 °C Vanderwaals radius: 0.196 nm Ionic radius:  0.095 (+1) nm <span style="color: black; font-family: 'Verdana','sans-serif'; font-size: 9pt; mso-bidi-font-weight: bold;">Isotopes:  <span style="color: black; font-family: 'Verdana','sans-serif'; font-size: 9pt;">3 <span style="color: black; font-family: 'Verdana','sans-serif'; font-size: 9pt; mso-bidi-font-weight: bold;">Electronic shell: <span style="color: black; font-family: 'Verdana','sans-serif'; font-size: 9pt;">[Ne] 3s1 <span style="color: black; font-family: 'Verdana','sans-serif'; font-size: 9pt; mso-bidi-font-weight: bold;">Energy of first ionization: <span style="color: black; font-family: 'Verdana','sans-serif'; font-size: 9pt;">495.7 kJ.mol -1 <span style="color: black; font-family: 'Verdana','sans-serif'; font-size: 9pt; mso-bidi-font-weight: bold;">Standard potential: l <span style="color: black; font-family: 'Verdana','sans-serif'; font-size: 9pt;">- 2.71 V <span style="color: black; font-family: 'Verdana','sans-serif'; font-size: 9pt; mso-bidi-font-weight: bold;">Discovered by: <span style="color: black; font-family: 'Verdana','sans-serif'; font-size: 9pt;">Sir Humphrey Davy in 1807

__ **History of Sodium:** __

<span style="font-family: 'Calibri','sans-serif'; font-size: 11pt; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin;"> Salt has been an important commodity in human activities, as testified by the English word salary, referring to salarium , the wafers of salt sometimes given to Roman soldiers along with their other wages.In medieval Europe a compound of sodium with the Latin name of sodanum was used as a headache remedy. The name sodium probably originates from the Arabic word suda meaning headache as the headache-alleviating properties of sodium carbonate or soda were well known in early times. Sodium's chemical abbreviation Na was first published by Jöns Jakob Berzelius in his system of atomic symbols and is a contraction of the element's new Latin name natrium which refers to the Egyptian the word for a natural mineral salt whose primary ingredient is hydrated sodium carbonate. Hydrated sodium carbonate historically had several important industrial and household uses later eclipsed by soda ash, baking soda and other sodium compounds.

<span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; msoasciithemefont: minor-latin; msohansithemefont: minor-latin;"> 1.<span style="font-family: 'Calibri','sans-serif'; font-size: 11pt; line-height: 115%; mso-ansi-language: EN-US; mso-ascii-theme-font: minor-latin; mso-bidi-font-family: Arial; mso-bidi-language: AR-SA; mso-fareast-font-family: Calibri; mso-fareast-language: EN-US; mso-fareast-theme-font: minor-latin; mso-hansi-theme-font: minor-latin;">Metallic sodium 2.Table Salt 3. Sodium chloride 4. Soap 5. Glass 6. Sodium hydride
 * __ What sodium is used in? __**

__ **References:** __

Picture: http://z.about.com/d/chemistry/1/0/2/Q/sodium.jpg Info: http://en.wikipedia.org/wiki/Sodium#History Info: []