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.
Most of Hudson County, apart from West Hudson, was part of Bergen Township, which dates back to 1661 and was formally created by an act of the New Jersey Legislature on February 21, 1798, as one of the first group of 104 townships formed in New Jersey, while the area was still a part of Bergen County.