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Beryllium (4 Be) has 11 known isotopes and 3 known isomers, but only one of these isotopes (9 Be) is stable and a primordial nuclide. As such, beryllium is considered a monoisotopic element.
Many beryllium isotopes have multiple decay paths depending on the overall energy of the nucleus and its total angular momentum quantum number. This table lists the known isotopes of beryllium, their half-life, and type of radioactive decay.
List, data and properties of all known isotopes of Beryllium. 12 isotopes or nuclides of the element beryllium are known, of which only one - 9 Be - is stable. This makes beryllium a pure element and the only monoisotopic chemical element with an even number of protons in the nucleus. The atomic mass of beryllium is 9.0121831 (5) u.
Beryllium isotopes (stable 9 Be and cosmogenic meteoric 10 Be) enter the oceans through distinct pathways – i.e., from the continents and the atmosphere respectively – and display non-conservative behaviour in seawater.
Beryllium has but a single isotope, beryllium-9 which is not radioactive but beryllium-10, which cosmic rays produce in the upper atmosphere, is radioactive with a half-life of 1.5 million years.
Naturally occurring beryllium, save for slight contamination by the cosmogenic radioisotopes, is isotopically pure beryllium-9, which has a nuclear spin of 3 2 . Beryllium has a large scattering cross section for high-energy neutrons, about 6 barns for energies above approximately 10 keV.
The only naturally occurring isotope is the stable beryllium-9, although 11 other synthetic isotopes are known. Their half-lives range from 1.5 million years (for beryllium-10, which undergoes beta decay) to 6.7 × 10 −17 second for beryllium-8 (which decays by two-proton emission).
Beryllium (atomic number 4) has twelve isotopes, but only three are routinely measured: 7 Be, 9 Be, and 10 Be. 9 Be is a stable isotope that is found naturally in geological materials typically at μg g −1 levels and is considered in the Beryllium chapter.
Beryllium (4 Be) has 11 known isotopes and 3 known isomers, but only one of these isotopes (9Be) is stable and a primordial nuclide. As such, beryllium is considered a monoisotopic element.
Further data for naturally occuring isotopes of beryllium are listed above. This table gives information about some radiosotopes of beryllium, their masses, their half-lives, their modes of decay, their nuclear spins, and their nuclear magnetic moments.