Writing Ionic Formulas A chemical formula is a combination of elemental symbols and subscript numbers that is used to show the composition of a compound.
Here's a timeline of how Wrigley Field (Weeghman Park when it was first built) was constructed, and the various changes that have been made to it over the years. 1914: Opened April 23 as the home of the Federal League Chicago Whales, with a single deck that seated 14,000.
In 1984 when the Cubs made the playoffs, MLB threatened that if the team made the postseason in the future, games would be moved to a location that had lights. Finally on February 23, 1988, the Cubs decided to install lights at Wrigley Field.