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Hydrogen (H) has three natural isotopes designated ¹H, ²H a ³H. These isotopes also have "trivial" names that are still commonly used. ²H is often called deuterium or heavy hydrogen, and ³H is called tritium or very heavy hydrogen. The simplest isotope of hydrogen, which has no neutrons in the core, is called the counter.
Deuterium which sometimes uses the chemical symbol D, is neither radioactive nor toxic. Water enriched with deuterium molecules instead of protium is called heavy water (D₂O). Heavy water serves as a neutron moderator and coolant of nuclear reactors.
