(a(i))[1]
State how many protons there are in an atom of protactinium-234.
(a(ii))[1]
State how many nucleons are in an atom of protactinium-234.
(b)[1]
State what these different forms of the same element are called.
(c(i))[1]
State what a beta ($\beta$)-particle is.
(c(ii))[3]
Calculate the half-life of protactinium-234m from the data in Fig. 10.1. Make your working clear on the graph or in the space provided.
(c(iii))[1]
Suggest a reason why the half-life of protactinium-234m makes it suitable for this demonstration during a lesson.