Lawrie Ryan and Roger Norris Solutions for Chapter: Lattice Energy, Exercise 5: Question

Suggest why the second and third electron affinities are always endothermic.

The first electron affinity of sulphur is $-200 {\mathrm{KJmol}}^{-1}$.  The second electron affinity of sulphur is $+640 {\mathrm{KJmol}}^{-1}$. Calculate a value for the enthalpy change $\mathrm{S}\left(\mathrm{g}\right)+2{\mathrm{e}}^{-}\to {\mathrm{S}}^{2-}\left(\mathrm{g}\right)$. 

Write an equation representing the first electron affinity of iodine.

Write an equation representing the second electron affinity of sulphur.

Explain the trend in the first electron affinities going from Sulphur to tellurium.