Properties of Tungsten and Rubidium
Hardness
  
  
Brinell Hardness
2,000.00 MPa
  
4
Vickers Hardness
3,430.00 MPa
  
1
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
4,620.00 m/s
  
16
1,300.00 m/s
  
99+
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
W
  
Rb
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
770.00 kJ/mol
  
16
403.00 kJ/mol
  
99+
2nd Energy Level
1,700.00 kJ/mol
  
29
2,633.00 kJ/mol
  
6
3rd Energy Level
Not Available
  
3,860.00 kJ/mol
  
11
Electrochemical Equivalent
1.14 g/amp-hr
  
99+
3.19 g/amp-hr
  
14
Other Chemical Properties
Density
  
  
Density At Room Temperature
19.25 g/cm3
  
16
1.53 g/cm3
  
99+
Density When Liquid (at m.p.)
1.46 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Not Available
  
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
Symbol
W
  
Rb
  
Period Number
6
  
5
  
Atomic Volume
9.53 cm3/mol
  
99+
55.90 cm3/mol
  
2
Electron Configuration
[Xe] 4f14 5d4 6s2
  
[Kr] 5s1
  
Valence Electron Potential
140.00 (-eV)
  
5
9.47 (-eV)
  
99+
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
52.80 nΩ·m
  
99+
128.00 nΩ·m
  
26
Electrical Conductivity
0.19 106/cm Ω
  
10
0.08 106/cm Ω
  
24
Electron Affinity
78.60 kJ/mol
  
13
46.90 kJ/mol
  
24
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.13 J/(kg K)
  
39
0.36 J/(kg K)
  
17
Thermal Conductivity
173.00 W/m·K
  
7
58.20 W/m·K
  
26
Critical Temperature
Not Available
  
Molar Heat Capacity
24.27 J/mol·K
  
99+
31.06 J/mol·K
  
5
Thermal Expansion
4.50 µm/(m·K)
  
99+
90.00 µm/(m·K)
  
2
Standard Molar Entropy
32.60 J/mol.K
  
99+
76.80 J/mol.K
  
5
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol
  
1
69.20 kJ/mol
  
99+
Enthalpy of Fusion
35.23 kJ/mol
  
1
2.19 kJ/mol
  
99+
Enthalpy of Atomization
837.00 kJ/mol
  
1
82.00 kJ/mol
  
99+