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.
Aston Township is located in southwestern Delaware County, northwest of Chester and southwest of Media, the county seat. The borough of Chester Heights is along the northwest border of the township. Chester Creek, a southeast-flowing tributary of the Delaware River, forms the eastern border of the township.