Lewis acids and bases studied chemical bonding. In 1923, Lewis wrote "An acid substance is one which can employ an electron lone pair from another molecule in completing the stable group of one of its own atoms." The Brønsted–Lowry acid–base theory was published in the same year. The two theories are distinct but complementary. A Lewis base is also a Brønsted–Lowry base, but a Lewis acid doesn't need to be a Brønsted–Lowry acid. The classification into hard and soft acids and bases (HSAB theory) followed in 1963. The strength of Lewis acid-base interactions, as measured by the standard enthalpy of formation of an adduct
2012 Super League season results at Etihad Stadium as part of Magic Weekend<br> F. Galpharm Stadium renamed John Smith's Stadium as of 1 August 2012 <br> G. Game switched to Leigh Sports Village due to fixture clash with co-tenants Sale Sharks 2012 Super League season results This is a list of the 2012 Super League season results. Super League is the top-flight rugby league competition in the United Kingdom and France. The 2012 season started on 4 February and ends on 6 October with the 2012 Super League Grand Final at Old Trafford. The Magic Weekend was scheduled over the weekend of 26 and 27