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, MA. Hudson is located close to the center of Massachusetts. Hudson is part of Middlesex County. Hudson has 5.74 square miles of land area and 0.18 square miles of water area. As of 2010-2014, the total Hudson population is 15,212, which has grown 5.73% since 2000.