3. Manganese forms several oxides. The energy of the crystal lattice of one of them is 11916 kJ/mol. Write the formula for this oxide, knowing that the radius of the oxygen ion is 0.14 nm, and the radii of manganese ions: (7) 0.046 nm; (4) 0.06 nm; (2) 0.08 nm (according to Pauling).

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