Chemical substance identity of benzene, until the correct structure was described by Friedrich August Kekulé. Likewise, the idea of stereoisomerism – that atoms have rigid three-dimensional structure and can thus form isomers that differ only in their three-dimensional arrangement – was another crucial step in understanding the concept of distinct chemical substances. For example, tartaric acid has three distinct isomers, a pair of diastereomers with one diastereomer forming two enantiomers. An element is a chemical substance made up of a particular kind of atom and hence cannot be broken down or transformed by a chemical reaction into a different element, though it
Rashard Lewis Cavaliers, what he called the biggest shot of his career. The Magic won the series and advanced to the NBA Finals, where they were defeated by the Los Angeles Lakers in five games. On August 6, 2009, Lewis was suspended without pay for the first ten games of the 2009–10 season after testing positive for a banned substance. On December 18, 2010, Lewis was traded to the Washington Wizards in exchange for Gilbert Arenas. In 60 games for the Wizards over two seasons, Lewis averaged 9.7 points, 4.9 rebounds and 1.5 assists per game. On June 20, 2012, Lewis was