- Sodium is the chemical element with the symbol Na (from Latin natrium) and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is 23Na. The free metal does not occur in nature and must be prepared from compounds. Sodium is the sixth most abundant element in the Earth’s crust and exists in numerous minerals such as feldspars, sodalite, and halite (NaCl). Many salts of sodium are highly water-soluble: sodium ions have been leached by the action of water from the Earth’s minerals over eons, and thus sodium and chlorine are the most common dissolved elements by weight in the oceans.
- The Last Hero (allthetropes.org)
The 27th Discworld story, the text is roughly the length of a short novel, but each page features lavish illustrations by Paul Kidby, providing much amusing side info (such as a breakdown of different breeds of swamp dragon) and very epic images that capture almost every detail of the characters ever mentioned.