For polyatomic ions like MnO4^- and Cr2O7^2-, are the manganate/chromium covalent or ionic bonded to the oxygen. Based on diagrams I see online, it seems to be covalent but why is this
PDF) High Performance LiMn2O4 Cathode Materials Grown with Epitaxial Layered Nanostructure for Li-Ion Batteries
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