The nucleus of deuterium is called a deuteron. (atomic mass 2.014 101 777 844(15) Da), the other stable hydrogen isotope, is known as deuterium and contains one proton and one neutron in its nucleus. (During the early study of radioactivity, some other heavy radioactive isotopes were given names, but such names are rarely used today.)Ī deuterium atom contains one proton, one neutron, and one electron. , with no neutrons, is sometimes called protium. ) instead to avoid confusion in the alphabetic sorting of chemical formulas. The IUPAC accepts the D and T symbols, but recommends using standard isotopic symbols ( 2 The symbols D and T are sometimes used for deuterium and tritium. (or hydrogen-2) isotope is deuterium and the 3 Hydrogen is the only element whose isotopes have different names that remain in common use today: the 2 Heavier isotopes also exist, all of which are synthetic and have a half-life of less than one zeptosecond (10 −21 s). Hydrogen ( 1H) has three naturally occurring isotopes, sometimes denoted 1 The three most stable isotopes of hydrogen: protium ( A = 1), deuterium ( A = 2), and tritium ( A = 3).
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