Mass defect of a nucleus (Δm = Zm_p + Nm_n − M_nucleus)
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Δm = Zm_p + Nm_n − M_nucleus
What each symbol means
| Symbol | What it stands for |
|---|---|
| A | Mass number |
| N | A−Z neutrons |
| Z | Proton number |
| m_n | Neutron mass |
| m_p | Proton mass |
| Δm | Mass defect (kg or u) |
| m_nuc | Actual nuclear mass |
When to use this
Binding includes electron mass corrections in atomic mass convention — JEE problems usually give unified atomic masses to subtract directly.