MnCO5
MnCO5 refers to a hypothetical chemical compound involving manganese (Mn) and carbonate (CO3). While manganese commonly forms carbonates like manganese(II) carbonate (MnCO3), the formula MnCO5 is not recognized as a stable or commonly encountered compound in standard chemical literature. The oxidation state of manganese in MnCO3 is typically +2. The presence of five oxygen atoms within the carbonate group (CO3) is chemically impossible under normal circumstances, as the carbonate anion has a fixed structure with a charge of -2.
The notation MnCO5 might arise from a misunderstanding of chemical formulas or potentially from theoretical calculations