(a(i))[1]
Using the mass spectrum, fill in the table with the relative abundances of the three isotopes: $^{24}\text{Mg}$, $^{25}\text{Mg}$ and $^{26}\text{Mg}$.
(a(ii))[1]
Use the values from (i) to calculate the relative atomic mass, $A_r$, of magnesium, giving your answer to two decimal places.
(b(i))[3]
Describe and explain the change in the thermal stabilities of the nitrates of the Group II elements down the group.
(b(ii))[1]
Suggest an equation for the effect of heat on $\text{LiNO}_3$.
(b(iii))[1]
Suggest why the Group I nitrates other than $\text{LiNO}_3$ do not decompose in this way on heating.