Chemical elements
    Physical Properties
      Sodium Ion
      Atomic Weight
    Chemical Properties
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Sodium Ion

The strong tendency of sodium towards ionization is in accordance with the view that the ion is the more stable form, and with the fact that the heat of ionization per gram-equivalent of the metal is 57.400 Cal. The ion is univalent and colourless, but with coloured anions yields substances coloured both in the solid state and in solution. For the atomic refraction Rudorff gives 4.65, and for the transport number Tolman found 0.615. The conductivity of the sodium ion at 18° C. is 43.4, and at 25° C. is 51.2.

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