Physics (AS & A Level) · Oct / Nov 2017 · Paper 12 · Question 39

The diagram shows a sequence of radioactive decays involving three α-particles and a β⁻ particle. [Diagram: ²³⁷₉₃Np → Q (α) → R (β⁻) → S (α) → T (α)] What is nuclide T?

1. A²²⁵₈₈Ra
2. B²³¹₈₈Ra
3. C²²⁵₉₀Th
4. D²²⁹₉₀Th

As printed in the paper