Protium is the most common isotope of hydrogen, consisting of one proton and one electron, with no neutrons. It has an atomic number of 1 and an atomic mass of approximately 1 atomic mass unit (amu). Protium is represented by the symbol H and is a key element in various chemical reactions, including those in water and organic compounds. As the simplest and lightest element, Protium plays a crucial role in the universe, being a primary component of stars, including our Sun. It is essential for the formation of molecules and is involved in processes like nuclear fusion, which powers stars and produces energy.