Solution:

Chapter 5, Problem 79AE

(choose chapter or problem)

(a) Explain the following trend in lattice energy: \(BeH_2\) 3205 kJ/mol; \(MgH_2\), 2791 kJ/mol; \(CaH_2\), 2410 kJ/mol; \(SrH_2\), 2250 kJ/mol; \(BaH_2\), 2121 kJ/mol.

(b) The lattice energy of \(ZnH_2\) is 2870 kJ/mol. Based on the data given in part (a), the radius of the \(Zn^{2+}\) ion is expected to be closest to that of which group 2A element?

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