(a(i))[1]
State in what way the composition of the nucleus of americium-241 is different from that of the nucleus of americium-242.
(a(ii))[2]
State two ways in which the nucleus of this atom differs in composition from a nucleus of americium-241.
(b(i))[3]
Complete this decay equation: $^{241}_{95}\text{Am} \rightarrow {}^{?}_{93}\text{Np} + {}^{?}_{2}\alpha$.
(b(ii))[2]
Explain why $\alpha$-particles ionise more strongly than $\beta$-particles.
(b(iii))[2]
Using this information, explain the benefit of this long half-life for the operation and safe disposal of a household smoke alarm.