Properties of Rubidium and Chromium
Melting Point
1,857.00 °C
  
14
Boiling Point
2,672.00 °C
  
39
Hardness
  
  
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
1,300.00 m/s
  
99+
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
Rb
  
Cr
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
403.00 kJ/mol
  
99+
26,130.00 kJ/mol
  
1
2nd Energy Level
2,633.00 kJ/mol
  
6
28,750.00 kJ/mol
  
1
3rd Energy Level
3,860.00 kJ/mol
  
11
34,230.00 kJ/mol
  
1
Electrochemical Equivalent
3.19 g/amp-hr
  
14
0.32 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
1.53 g/cm3
  
99+
7.19 g/cm3
  
99+
Density When Liquid (at m.p.)
1.46 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
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
NA
  
Symbol
Rb
  
Cr
  
Period Number
5
  
4
  
Atomic Volume
55.90 cm3/mol
  
2
7.23 cm3/mol
  
99+
Electron Configuration
[Kr] 5s1
  
[Ar] 3d5 4s1
  
Valence Electron Potential
9.47 (-eV)
  
99+
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
128.00 nΩ·m
  
26
125.00 nΩ·m
  
27
Electrical Conductivity
0.08 106/cm Ω
  
24
0.08 106/cm Ω
  
25
Electron Affinity
46.90 kJ/mol
  
24
64.30 kJ/mol
  
15
Electrical Property
NA
  
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.36 J/(kg K)
  
17
0.45 J/(kg K)
  
12
Thermal Conductivity
58.20 W/m·K
  
26
93.90 W/m·K
  
17
Critical Temperature
Not Available
  
Molar Heat Capacity
31.06 J/mol·K
  
5
23.35 J/mol·K
  
99+
Thermal Expansion
90.00 µm/(m·K)
  
2
4.90 µm/(m·K)
  
99+
Standard Molar Entropy
76.80 J/mol.K
  
5
23.80 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
69.20 kJ/mol
  
99+
348.80 kJ/mol
  
24
Enthalpy of Fusion
2.19 kJ/mol
  
99+
15.31 kJ/mol
  
20
Enthalpy of Atomization
82.00 kJ/mol
  
99+
397.50 kJ/mol
  
21