Plutonium-238 $$\(\left({ }_{94}^{238} \mathrm{Pu}\right)\)$$ is unstable and undergoes alpha decay. Complete the equation to show the decay of plutonium-238.

11.1 Atoms, nuclei and radiation

23.2.1 infer the random nature of radioactive decay from the fluctuations in count rate

23.2.2 show an appreciation of the spontaneous and random nature of nuclear decay

23.2.3 define the terms activity and decay constant and recall and solve problems using

23.2.4 infer and sketch the exponential nature of radioactive decay and solve problems using the relationship $x=x_{0} e^{-m t}$, where x could represent activity, number of undecayed nuclei or received count rate

23.2.5 define half-life

23.2.6 solve problems using the relation