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Manganese


4
25
54.93805
KEY
Chemical Element Symbol Key

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Manganese
Columbia Encyclopedia
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Iron (Fe)
Symbol: Mn
Atomic Number: 25
Atomic Weight: 54.93805
Element Classification: Transition Metal
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 (@20°C J/g mol): 0.477
Fusion Heat (kJ/mol): (13.4)
Evaporation Heat (kJ/mol): 221
Thermal Conductivity (@25°C W/m K):
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 (Å): 8.890
Lattice C/A Ratio: n/a


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