Science, Tech, Math › Science Beryllium Isotopes Radioactive Decay and Half-Life of Isotopes of Beryllium Share Flipboard Email Print Science Picture Co/Collection Mix:Subjects/Getty Images Science Chemistry Periodic Table Basics Chemical Laws Molecules Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated February 15, 2020 All beryllium atoms have four protons but could have between one and ten neutrons. There are ten known isotopes of beryllium, ranging from Be-5 to Be-14. 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. The first entry corresponds to the nucleus where j=0 or the most stable isotope. Isotopes with multiple decay schemes are represented by a range of half-life values between the shortest and longest half-life for that type of decay.Reference: International Atomic Energy Agency ENSDF database (Oct 2010)IsotopeHalf-LifeDecayBe-5unknownpBe-65.8 x 10-22 sec - 7.2 x 10-21 secp or αBe-753.22 d3.7 x 10-22 sec - 3.8 x 10-21 secECα, 3He, p possibleBe-81.9 x 10-22 sec - 1.2 x 10-16 sec1.6 x 10-22 sec - 1.2 x 10-19 secαα D, 3He, IT, n, p possibleBe-9Stable4.9 x 10-22 sec - 8.4 x 10-19 sec9.6 x 10-22 sec - 1.7 x 10-18 secN/AIT or n possibleα, D, IT, n, p possibleBe-101.5 x 106 yrs7.5 x 10-21 sec1.6 x 10-21 sec - 1.9 x 10-20 secβ-npBe-1113.8 sec2.1 x 10-21 sec - 1.2 x 10-13 secβ-nBe-1221.3 msβ-Be-132.7 x 10-21 secbelieved nBe-144.4 msβ- αβ-DECγ3HeITnpalpha decaybeta- decaydeuteron or hydrogen-2 nucleus ejectedelectron capturehelium-3 nucleus ejectedisomeric transitionneutron emissionproton emission Isotope SourcesBeryllium forms in stars, but the radioactive isotopes don't last long. Primordial beryllium consists entirely of the one stable isotope, beryllium-9. Beryllium is a mononuclidic and monoisotopic element. Beryllium-10 is produced by cosmic ray spallation of oxygen in the atmosphere. SourcesHaynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. ISBN 1439855110.Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. ISBN 0-8493-0464-4.