German Atommasse Cited by user 17387349L8764 on 26 Mar 2024 Die Atommasse ist die Masse eines einzelnen Atoms.
Ukrainian Ізотопи гелію Cited by user Binc on 02 Mar 2024 Відомо дев'ять ізотопів гелію (2He) (стандартна атомна маса: 4,002602(2)), але стабільними є лише гелій-3 (3He) і гелій-4 (4He).
English Isotopes of neon Cited by user Citation bot on 04 Dec 2023 Neon (10Ne) possesses three stable isotopes:,, and. In addition, 17 radioactive isotopes have been discovered, ranging from to, all short-lived.
English Isotopes of helium Cited by user Citation bot on 03 Dec 2023 Although there are nine known isotopes of helium (2He) (standard atomic weight: 4.003), only helium-3 and helium-4 are stable.