List of chemical symbols. Most chemical elements are represented symbolically by two letters, generally the first two in their name. In some cases, the first letter together with some other letter from their name was used, particularly when their first two letters had already been allocated to another element.
Patterson Township, Beaver County, Pennsylvania. Patterson Township is a township in Beaver County, Pennsylvania, United States. The population was 3,029 at the 2010 census.
Middletown Township is a township in Delaware County, Pennsylvania, United States. The population was 16,064 at the 2000 census. The Pennsylvania State University has an undergraduate satellite campus located in the north-central portion of the township, while Neumann University, a private co-educational Franciscan university, is located in nearby Aston Township.