1 The electron pair is equally shared, but controlled by the ligand. 2  The ligand is a lewis base, and acts as an electron pair donor. The metal is the electron acceptor and a lewis acid.  Most metals form cationic ions in solutions (electron acceptors), and participate in coordination complexes.
The United States is comprised of 50 states plus the District of Columbia. There are also five U.S. territories throughout the world: Guam, the U.S. Virgin Islands, American Samoa, Puerto Rico and the Northern Marianas Islands.
The United States today is the third largest country in the world based on land area with a total of 3,794,100 square miles (9,826,675 sq km). It also has a population of 313,232,044 people (July 2011 estimate) and it is divided into 50 states and hundreds of different cities.