THE UNDERGROUND RAILROAD. By Colson Whitehead. 306 pp. Doubleday. $26.95. Colson Whiteheadâs novels are rebellious creatures: Each one of them goes to great lengths to break free of the last one, of its structure and language, of its areas of interest.
Natron is a naturally occurring mixture of sodium carbonate decahydrate (Na 2 C O 3 Â·10H 2 O, a kind of soda ash) and around 17% sodium bicarbonate (also called baking soda, NaHCO 3) along with small quantities of sodium chloride and sodium sulfate.
Boron is a nonmetallic element with the atomic number 5, identified by the symbol B on the periodic table. There are a number of uses for it, and like many elements, it appears in various forms which have different potential applications. Pure elemental boron, however, is not found in nature, and it must be chemically extracted.