Radium is a Group 2 element. The predicted lattice energy, ∆H°latt, of radium sulfide, RaS, is –2612kJ mol⁻¹. Some data relating to radium and sulfur are listed. Select relevant data from this list for use in your answers to parts (b) to (e). process value/kJ mol⁻¹ enthalpy change for Ra(s) → Ra²⁺(g) + 2e⁻ +1619 first ionisation energy of sulfur +1000 second ionisation energy of sulfur +2260 first electron affinity of sulfur -200 second electron affinity of sulfur +532 enthalpy change for S(s) + 2e⁻ → S²⁻(g) +555 lattice energy of RaS(s) -2612