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