Manganese is a hard, brittle, silvery-gray transition metal denoted by the chemical symbol Mn. It is widely used in industry, particularly to harden steel and prevent it from rusting.
The standard atomic mass of Manganese (Mn) is 54.938 u (unified atomic mass units).
Element Symbol: Mn (Manganese).
Atomic Number: 25.
Exact Atomic Mass: 54.938 u.
Rounded Mass Number: 55 (used in calculations).
Protons & Neutrons: 25 Protons and 30 Neutrons.
To understand its atomic mass, we must look at its subatomic particles:
Because the exact atomic mass is 54.938 u, chemistry students universally round this up. For all stoichiometry and molar mass calculations (like calculating the molar mass of Potassium Permanganate, KMnO₄), the Mass Number of Manganese is taken as 55.
Manganese is located in Group 7 and Period 4 of the periodic table. Because it is a transition metal, it exhibits multiple oxidation states, ranging from +2 to +7. The +2 (Mn²⁺) and +7 (as in the permanganate ion, MnO₄⁻) are the most stable and common.
The exact atomic mass of Manganese (Mn) is 54.938 u, which is rounded to 55 for standard chemical calculations.
The only stable, naturally occurring isotope of Manganese (Mn-55) contains 30 neutrons.
Yes, Manganese is a transition metal located in the d-block (Group 7) of the periodic table.
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