Manganese
Symbol
Mn
Atomic Number
25
Atomic Weight
54.93805
Element Classification
Discovered By
Johann Gahn
Discovery Date
1774 (Sweden)
Name Origin
Latin: magnes (magnet), Italian: manganese.
Density (g/cc)
7.21
Melting Point (K)
1517
Boiling Point (K)
2235
Appearance
Hard, brittle, gray-white metal
Atomic Radius (pm)
135
Atomic Volume (cc/mol)
7.39
Covalent Radius (pm)
117
Ionic Radius
46 (+7e) 80 (+2e)
Specific Heat
0.477
Fusion Heat (kJ/mol)
(13.4)
Evaporation Heat (kJ/mol)
221
Thermal Conductivity (@25°C W/m K)
(7.8)
Debye Temperature (K)
400.00
Pauling Negativity Number
1.55
First Ionizing Energy (kJ/mol)
716.8
Oxidation States
7, 6, 4, 3, 2, 0, -1
Electronic Configuration
[Ar] 3d5 4s2
Lattice Structure
Cubic(CUB)
Lattice Constant
8.890
Lattice C/A Ratio
n/a
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