(a)[2]
Describe the arrangement of particles in an atom of uranium-238, $^{238}_{92}\text{U}$.
(b)[3]
The decay of uranium-238 is represented by $^{238}_{92}\text{U} \rightarrow {}^{234}_{90}\text{Th} + X$. For nucleus $X$, calculate the ratio, in $\text{C kg}^{-1}$, of $\dfrac{\text{charge}}{\text{mass}}$.
(c(i))[1]
Two particles P and Q each contain three quarks. The quarks are up (u) or down (d) quarks. Particle P has no overall charge. State the quark composition of particle P.
(c(ii))[1]
Two particles P and Q each contain three quarks. The quarks are up (u) or down (d) quarks. Particle Q has an overall charge of $+2e$, where $e$ is the elementary charge. State the quark composition of particle Q.