Daughter Nuclide
Definition and meaning of Daughter Nuclide in chemistry.
Daughter nuclide refers to the nuclide (isotope of an element) that remains after a parent nuclide undergoes radioactive decay, such as alpha or beta emission.
In more detail
Each type of decay changes the parent's atomic number and/or mass number in a predictable way: alpha decay lowers the mass number by 4 and the atomic number by 2, while beta-minus decay raises the atomic number by 1 with no change in mass number. Mass number and charge (atomic number) must balance on both sides of the nuclear equation, which is how the identity of the daughter nuclide is determined. A daughter nuclide is not necessarily stable; it may itself be radioactive and decay further, producing a chain of daughters called a decay series that ends only when a stable nuclide is reached.
Key facts
| Field | General Chemistry |
|---|---|
| Produced by | Alpha, beta, or gamma decay of a parent nuclide |
| Conserved quantities | Mass number (A) and atomic number (Z) |
| Stability | May be stable or continue decaying in a decay series |
Uranium-238 undergoes alpha decay to produce thorium-234, the daughter nuclide, releasing an alpha particle (helium-4 nucleus) in the process: U-238 → Th-234 + He-4.
Frequently asked questions
Is a daughter nuclide always stable?
No. Many daughter nuclides are themselves radioactive and continue decaying through a decay series, such as uranium-238 decaying through a chain of daughters to the stable nuclide lead-206.
How is the daughter nuclide's identity determined?
By conserving mass number and atomic number (charge) across the nuclear decay equation; for example, alpha decay reduces the mass number by 4 and the atomic number by 2 relative to the parent.