(a) Write the chemical equations that are used in calculating the lattice energy of SrCl2(...

(a) Write the chemical equations that are used in calculating the lattice energy of SrCl2(s) via a Born–Haber cycle. (b) The second ionization energy of Sr(g) is 1064 kJ/mol. Use this fact along with data in Appendix C, Figure, Figure, and Table to calculate ΔHf° for SrCl2(s).

The value for astatine, At, is missing in this figure. To the nearest 100 kJ>mol, what estimate would you make for the first ionization energy of At?

Figure Trends in first ionization energies of the elements.

Why are the electron affinities of the Group 4A elements more negative than those of the Group 5A elements?

Figure Electron affinity in kJ/mol for selected s-and p-block elements.

Table Lattice Energies for Some Ionic Compounds