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 is a town in Middlesex County, Massachusetts, United States. Before its incorporation as a town in 1866, Hudson was a neighborhood and unincorporated village within the town of Marlborough, Massachusetts, and was known as Feltonville, and before that, known as Eastborough. From around 1850 until the last shoe factory burned down in 1968, Hudson was known as a shoe town..