Properties of Chromium and Ruthenium
Melting Point
1,857.00 °C
  
14
Boiling Point
2,672.00 °C
  
39
3,900.00 °C
  
14
Hardness
  
  
Brinell Hardness
2,160.00 MPa
  
3
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
5,970.00 m/s
  
4
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Cr
  
Ru
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
26,130.00 kJ/mol
  
1
710.20 kJ/mol
  
32
2nd Energy Level
28,750.00 kJ/mol
  
1
710.22 kJ/mol
  
99+
3rd Energy Level
34,230.00 kJ/mol
  
1
2,747.00 kJ/mol
  
37
Electrochemical Equivalent
0.32 g/amp-hr
  
99+
1.26 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
7.19 g/cm3
  
99+
12.45 g/cm3
  
27
Density When Liquid (at m.p.)
10.65 g/cm3
  
16
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
Symbol
Cr
  
Ru
  
Period Number
4
  
5
  
Atomic Weight
101.07 amu
  
99+
Atomic Volume
7.23 cm3/mol
  
99+
8.30 cm3/mol
  
99+
Electron Configuration
[Ar] 3d5 4s1
  
[Kr] 4d7 5s1
  
Valence Electron Potential
170.00 (-eV)
  
4
64.00 (-eV)
  
22
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
rystal-Structure-of-Ruthenium.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, 2 π/3
  
Lattice C/A Ratio
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
125.00 nΩ·m
  
27
Electrical Conductivity
0.08 106/cm Ω
  
25
0.14 106/cm Ω
  
16
Electron Affinity
64.30 kJ/mol
  
15
101.30 kJ/mol
  
10
Electrical Property
NA
  
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.45 J/(kg K)
  
12
0.24 J/(kg K)
  
24
Thermal Conductivity
93.90 W/m·K
  
17
117.00 W/m·K
  
13
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
23.35 J/mol·K
  
99+
24.06 J/mol·K
  
99+
Thermal Expansion
4.90 µm/(m·K)
  
99+
6.40 µm/(m·K)
  
99+
Standard Molar Entropy
23.80 J/mol.K
  
99+
28.50 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
348.80 kJ/mol
  
24
567.80 kJ/mol
  
10
Enthalpy of Fusion
15.31 kJ/mol
  
20
25.50 kJ/mol
  
7
Enthalpy of Atomization
397.50 kJ/mol
  
21
603.00 kJ/mol
  
9