Properties of Manganese and Chromium
Melting Point
1,245.00 °C
  
37
1,857.00 °C
  
14
Boiling Point
1,962.00 °C
  
99+
2,672.00 °C
  
39
Hardness
  
  
Brinell Hardness
196.00 MPa
  
99+
Vickers Hardness
Not Available
  
1,060.00 MPa
  
10
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Not Available
  
Speed of Sound
5,150.00 m/s
  
7
5,940.00 m/s
  
5
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Mn
  
Cr
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
717.30 kJ/mol
  
30
26,130.00 kJ/mol
  
1
2nd Energy Level
1,509.00 kJ/mol
  
39
28,750.00 kJ/mol
  
1
3rd Energy Level
3,248.00 kJ/mol
  
21
34,230.00 kJ/mol
  
1
Electrochemical Equivalent
0.29 g/amp-hr
  
99+
0.32 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
7.21 g/cm3
  
99+
7.19 g/cm3
  
99+
Density When Liquid (at m.p.)
5.95 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
NA
  
NA
  
Symbol
Mn
  
Cr
  
Period Number
4
  
4
  
Atomic Volume
1.39 cm3/mol
  
99+
7.23 cm3/mol
  
99+
Electron Configuration
[Ar] 3d5 4s2
  
[Ar] 3d5 4s1
  
Valence Electron Potential
220.00 (-eV)
  
2
170.00 (-eV)
  
4
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
125.00 nΩ·m
  
27
Electrical Conductivity
0.01 106/cm Ω
  
99+
0.08 106/cm Ω
  
25
Electron Affinity
0.00 kJ/mol
  
40
64.30 kJ/mol
  
15
Electrical Property
NA
  
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.48 J/(kg K)
  
11
0.45 J/(kg K)
  
12
Thermal Conductivity
7.81 W/m·K
  
99+
93.90 W/m·K
  
17
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
26.32 J/mol·K
  
29
23.35 J/mol·K
  
99+
Thermal Expansion
21.70 µm/(m·K)
  
21
4.90 µm/(m·K)
  
99+
Standard Molar Entropy
32.00 J/mol.K
  
99+
23.80 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
219.70 kJ/mol
  
99+
348.80 kJ/mol
  
24
Enthalpy of Fusion
14.64 kJ/mol
  
23
15.31 kJ/mol
  
20
Enthalpy of Atomization
280.30 kJ/mol
  
38
397.50 kJ/mol
  
21