Atomic Element Z = 25 • Transition Metal
Manganese (Mn) — Atomic Data, Electron Shells & Reactions
Manganese (symbol Mn, atomic number 25) has a standard atomic weight of 54.938 u and ground-state configuration [Ar] 3d5 4s2.
Atomic Number (Z)
25
IUPAC Symbol
Mn
Standard Atomic Weight
54.938 g/mol
Period / Group / Block
4 / 7 / d-block
Condensed Electron Config
[Ar] 3d5 4s2
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d5 4s2
Principal Shell Occupancy
[2, 8, 13, 2]
Pauling Electronegativity
1.55
First Ionization Energy
717 kJ/mol
Covalent Radius
139 pm
Melting Point
1519 K (1245.85 °C)
Boiling Point
2334 K (2060.85 °C)
Density
7.44 g/cm³
Oxidation States
+7, +4, +2
Mn (Z=25) — Valence shell highlighted in vermilion
Interactive Stoichiometry Reactions Involving Manganese:
KMnO4 + HCl -> KCl + MnCl2 + Cl2 + H2O
KMnO4 + H2C2O4 + H2SO4 -> K2SO4 + MnSO4 + CO2 + H2O