The isotope 1H, with no neutrons, is sometimes called protium. The IUPAC accepts the D and T symbols, but recommends using standard isotopic symbols ( 2H and 3H) instead to avoid confusion in the alphabetic sorting of chemical formulas. The symbols D and T are sometimes used for deuterium and tritium. Hydrogen is the only element whose isotopes have different names that remain in common use today: the 2H (or hydrogen-2) isotope is deuterium and the 3H (or hydrogen-3) isotope is tritium. Of these, 7H is the most stable, and 5H is the least. Heavier isotopes also exist, all of which are synthetic and have a half-life of less than one zeptosecond (10 −21 s). 1H and 2H are stable, while 3H has a half-life of 12.32 ± 0.02 years. Hydrogen ( 1H) has three naturally occurring isotopes, sometimes denoted 1H, 2H, and 3H. The three most stable isotopes of hydrogen: protium ( A = 1), deuterium ( A = 2), and tritium ( A = 3).
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