Lewis acids and bases ionic bonding. Classically, the term "Lewis acid" is restricted to trigonal planar species with an empty p orbital, such as BR where R can be an organic substituent or a halide. For the purposes of discussion, even complex compounds such as EtAlCl and AlCl are treated as trigonal planar Lewis acids. Metal ions such as Na, Mg, and Ce, which are invariably complexed with additional ligands, are often sources of coordinatively unsaturated derivatives that form Lewis adducts upon reaction with a Lewis base[citation needed]. Other reactions might simply be referred to as "acid-catalyzed" reactions. Some compounds, such as HO, are
Orlando Magic his option for the 2010–11 season. They did the same for general manager Otis Smith, which would keep him in that position through the 2011–12 season. The Magic were without Rashard Lewis for the first 10 games of the 2009–10 season. Lewis tested positive for an elevated testosterone level that was caused by an over-the-counter supplement containing a substance banned by the league. To make matters worse, Vince Carter suffered a left ankle injury in just the second game of the season. Carter's injury turned out to be not too serious, but caused him to miss the next five games.