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The chemical symbol for Manganese is Mn. Each element is represented by a unique one- or two-letter symbol that often derives from its English or Latin name. In this case, Mn comes from the Latin name "manganum." This symbol is widely recognized in the periodic table of elements and is used in chemical formulas to represent this specific element, which is a transition metal located in group 7 of the periodic table. Understanding chemical symbols is fundamental in chemistry as it aids in the communication of chemical compounds, reactions, and properties. The other options represent different elements: Ni stands for Nickel, Cu represents Copper, and Zn is the symbol for Zinc. Each of these has its own distinct properties and uses in various chemical applications.