Binding Energy

Key Stage 5

Meaning

The binding energy of a nucleus is the work that must be done to separate a nucleus into its constituent neutrons and protons.

About the Binding Energy of a Nucleus

• Binding energy = mass defect × c².
• Binding energy measured in MeV.
• Binding energy indicates the stability of the nucleus with a higher binding energy indicating a more stable nucleus.
• Binding energy per nucleon represents the energy required to disassemble a nucleus into individual nucleons.
• The curve of binding energy per nucleon versus mass number shows a peak at iron (Fe-56).

Examples

• Helium-4 has a high binding energy per nucleon, making it very stable.
• Nuclear fusion and fission involve changes in binding energy, releasing energy.