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lattice energy of ZnH2 is 2870 kJ/mol
look for the Group 2A compound that has the closest lattice energy
Consider the lattice energies of the following Group 2A compounds: BeH 2, 3205 kJ/mol; MgH2, 2791 kJ/mol; CaH2, 2410 kJ/mol; SrH2, 2250 kJ/mol; BaH2, 2121 kJ/mol.
The lattice energy of ZnH2 is 2870 kJ/mol. Considering the trend in lattice enthalpies in the Group 2A compounds, predict which Group 2A element is most similar in ionic radius to the Zn2+ ion.
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