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Consider the lattice energies of the following Group 2A
compounds: BeH2, 3205 kJ/mol; MgH2, 2791 kJ/mol;
CaH2, 2410 kJ/mol; SrH2, 2250 kJ/mol; BaH2, 2121 kJ/mol.
(a) What is the oxidation number of H in these compounds?