(a)[1]
Define the enthalpy change of atomisation, $\Delta H_{at}$.
(b)[1]
Define the first electron affinity, EA.
(c)[2]
Explain why chlorine's first electron affinity is more exothermic than iodine's first electron affinity.
(d)[2]
The enthalpy change for the reaction $\text{Cl}_2\text{(g)} + 2e^- \rightarrow 2\text{Cl}^-\text{(g)}$ is $-486\,\text{kJ mol}^{-1}$. The first electron affinity of chlorine is $-364\,\text{kJ mol}^{-1}$. Calculate the enthalpy change of atomisation of chlorine. $\Delta H_{at}$ of chlorine $= \ldots\,\text{kJ mol}^{-1}$.