Enter your atom's Atomic Number (Z), Mass Number (A), and Atomic Mass (M) — along with Proton Mass (mp) and Neutron Mass (mn) — and this Mass Defect Calculator works out the Mass Defect (Δm), Binding Energy, Binding Energy per Nucleon, and Number of Neutrons (N) holding it all together.
Mass Defect (Δm)
--
Binding Energy
--
Binding Energy per Nucleon
--
Number of Neutrons (N)
--
A mass defect calculator is a specialized tool for nuclear physics that calculates the difference between the sum of individual nucleon masses and the actual atomic mass. This difference represents the binding energy that holds the nucleus together.
Mass defect is directly related to binding energy through Einstein's equation E=mc². The missing mass (mass defect) is converted into binding energy that holds the nucleus together. Higher mass defect means stronger nuclear binding.
Mass defect calculations help determine nuclear stability, predict radioactive decay, understand nuclear reactions, and calculate energy release in nuclear processes like fission and fusion.
The accuracy depends on the precision of input values, particularly atomic masses. Using high-precision atomic masses from NIST or similar databases ensures accurate results to several decimal places.
Yes, the calculator works for any nucleus as long as you have the atomic number, mass number, and accurate atomic mass. It's particularly useful for stable isotopes and common radioactive nuclei.
Binding energy per nucleon indicates nuclear stability. Nuclei with higher binding energy per nucleon (around 8-9 MeV) like iron-56 are most stable. This explains why both fusion and fission can release energy.
This is due to the mass-energy equivalence principle. When nucleons bind to form a nucleus, some mass is converted to binding energy and released, resulting in a lower total mass for the bound system.