A compound is a chemical substance that forms when two or more different elements combine in a fixed ratio. Water (H2O), for example, is a compound that is made up of two hydrogen atoms for every one oxygen atom. Sodium chloride (NaCl) is a compound made up of one sodium atom for every chlorine atom.
Hudson, Iowa. Hudson is a city in Black Hawk County, Iowa, United States. The population was 2,282 at the 2010 census. The rural community of Hudson has grown in recent years and is included as a part of the Waterloo-Cedar Falls Metropolitan Statistical Area. Contents.
Hudson, Florida. Hudson is a census-designated place (CDP) located at the westernmost end of Pasco County, Florida, United States and is included in the Tampa-St. Petersburg-Clearwater, Florida Metropolitan Statistical Area. As of the 2000 census, Hudson's population was 12,765.