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The following table shows the atomic nuclei that are isotonic (same neutron number N = 3) and isobaric (same nucleon number A = 5) with Helium-5. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Helium (2 He) (standard atomic weight: 4.002 602 (2)) has nine known isotopes, but only helium-3 (3 He) and helium-4 (4 He) are stable. [4] All radioisotopes are short-lived; the longest-lived is 6 He with half-life 806.92(24) milliseconds.
Click any isotope in diagram to see its data. GraphPlot IsotopeData Wolfram Research, Inc. Detailed decay information for the isotope helium-5 including decay chains and daughter products.
Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.
1 Σεπ 2024 · Access detailed info on all elements: atomic mass, electron configurations, charges, and more. View rotating Bohr models for all 118 elements. Get a free HD image of the Periodic Table.
The two following tables list the most important data and properties of the Helium isotopes. Further information on the individual Helium isotopes is listed on separate pages and can be accessed via the link in column 1. Atomic Properties. Radioactive Decay Properties. Notes (related to the columns): 1 - name of the nuclide, isotope.
Molecular weight: 4.002602. IUPAC Standard InChI: InChI=1S/He. IUPAC Standard InChIKey: SWQJXJOGLNCZEY-UHFFFAOYSA-N. CAS Registry Number: 7440-59-7. Chemical structure: This structure is also available as a 2d Mol file. Permanent link for this species. Use this link for bookmarking this species for future reference. Information on this page: Notes.
