Hydrogen, the simplest of all elements, is a Group 1A element possessing one proton and one electron. Henry Cavendish recognized it as a distinct substance in 1766 although it was produced on a regular basis much before that time. Antoine Lavoisier (1743-1794) named the element hydrogen which is based on the Greek hydro, meaning water and genes, meaning forming. Its atomic symbol is H and it has an atomic number of 1 with an atomic weight of 1.0079. It is estimated that 90% of all atoms in the universe are hydrogen, making it the most abundant element. Hydrogen has three isotopes, two of which are stable. The most common isotope, hydrogen-1, is called protium and is the most abundant of the three isotopes. In 1932, Harold Urey (1893-1981) prepared hydrogen-2, deuterium, and it is now known to exist as about one in 6,000 normal hydrogen atoms. Two years later tritium, hydrogen-3, the...