[10 marks] a) Why is hydrogen the only neutral atom for which the ionization energy can be readily calculated? [I mark] (b) Calculate the ionization energy of a neutral ground-state hydrogen atom. [4 marks] Report your answer in J. (c) Ionization energies are usually reported in kJ/mol. Convert your answer to part (b) into kJ/mol. [2 marks] (d) Calculate the longest wavelength of light that could be used to ionize a hydrogen atom. Report your answer in nm. [3 marks]