Nuclear reactions and the displacement rule
Answers are for parents and teachers.
1
²³⁸U → ²⁰⁶Pb. How many α-decays occur?
8
2
In the same chain (U: Z = 92, Pb: Z = 82) how many β⁻ decays must occur?
6
3
In a reaction Δm = 0.0200 u is released. What is Q approximately? (1 u = 931.5 MeV)
≈ 18.6 MeV
4
Into which nucleus does ²³⁰₉₀Th turn by α-decay (mass number and Z)?
²²⁶₈₈Ra
5
Why does the element change in β⁻-decay even though the mass number does not?
A neutron becomes a proton, Z rises by 1, so the atomic number and hence the element changes.