The energy released when nucleons form a nucleus, equivalent to the mass defect times c squared.
Practise Atomic Structure & Periodicity All Atomic Structure & Periodicity topics
Nuclear binding energy is the energy needed to split a nucleus into its separate nucleons, and it equals the mass defect multiplied by c squared. It is released when nucleons combine to form a nucleus, so a bound nucleus has less mass than its separate parts. Binding energy per nucleon peaks near iron-56, which makes fusion of light nuclei and fission of heavy nuclei both energy-releasing. This is why nuclear reactions release far more energy than chemical reactions. The binding energy shows how tightly nucleons are held together.
Key ideas: Binding energy is the energy needed to split a nucleus into separate nucleons, equal to delta m x c^2, with 1 u = 931.5 MeV. Binding energy per nucleon peaks near 8.8 MeV at 56Fe and is about 7.1 MeV for 4He, 7.6 for 12C, and 7.6 for 238U. Higher per-nucleon values mean greater stability.
Common mistakes and connections: Students use total binding energy rather than per nucleon when comparing stability, so large nuclei look more stable. Binding energy is not energy stored in the nucleus that is released as a result of reactions; the difference between initial and final values is released. It explains why fusion of light and fission of heavy nuclei both release energy.
Binding energy per nucleon peaks near iron-56, so fusing light nuclei or splitting heavy nuclei both move toward greater stability and release energy. The interactive lesson shows this as a live animation or chart.
Helium-4 has a total binding energy of about 28.3 MeV, or about 7.07 MeV per nucleon.
The energy released when nucleons form a nucleus, equivalent to the mass defect times c squared.
Nuclear Binding Energy is a advanced topic in Atomic Structure & Periodicity. It builds on beginner and intermediate topics, so review those first if needed.
Study these earlier topics in Atomic Structure & Periodicity first: Periodic Trends in Oxides, Hydrogen Position, Quark Structure of Nucleons.
The next topics in Atomic Structure & Periodicity are Mass Defect and Radioactivity.
Yes. The interactive lesson includes a self-check question on Nuclear Binding Energy, and the Atomic Structure & Periodicity quiz draws on every topic in this area.
Nuclear Binding Energy is topic 101 of 115 in Atomic Structure & Periodicity.