The article offers information on how the mass-2 hydrogen isotope discovered by Harold Urey was named deuterium. It states that Urey discovered the isotope in June 1933 and consulted people regarding the proper name for his discovery such as professor Gilbert N. Lewis because various names were suggested including deuterium, protium, and triterium. It mentions that Urey was awarded with the 1934 Nobel Prize in Chemistry for his discovery.