An isotope of iodine, $^{131}_{53}\text{I}$, undergoes $\beta$-emission to form an isotope of xenon (Xe).
(a(i))[2]
State how many of each particle there are in a neutral atom of $^{131}_{53}\text{I}$: protons, neutrons and electrons.
(a(ii))[2]
State the nuclide symbol for the xenon nucleus.
(b)[3]
On Fig. 10.1, plot appropriate points and sketch a graph of the sample count rate, after background correction, as it varies with time.
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