Question

(a) A thorium isotope ${}_{90}^{233}Th$ undergoes an $\alpha$ - decay and changes to radium. What are the atomic number and mass number of radium produced?
(b) If radium undergoes further disintegration and emits two $\beta$ - particles, represent the reaction in the form of an equation.
[3 MARKS]

Answer 1

Each Part: 1.5 Marks

(a) Atomic number and mass number of radium are 88 and 229, respectively.
(b) ${}_{88}^{229}Ra{\to }_{-1}^0\beta {+}_{89}^{229}X$