Properties of Berkelium and Cesium
Boiling Point
2,627.00 °C
  
40
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Not Available
  
Speed of Sound
Not Available
  
Not Available
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Bk
  
Cs
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
601.00 kJ/mol
  
99+
375.70 kJ/mol
  
99+
2nd Energy Level
1,186.00 kJ/mol
  
99+
2,234.30 kJ/mol
  
8
3rd Energy Level
2,152.00 kJ/mol
  
99+
3,400.00 kJ/mol
  
16
Electrochemical Equivalent
3.07 g/amp-hr
  
16
4.96 g/amp-hr
  
3
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
14.78 g/cm3
  
22
1.93 g/cm3
  
99+
Density When Liquid (at m.p.)
13.25 g/cm3
  
11
1.84 g/cm3
  
99+
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Not Available
  
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Not Available
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Not Available
  
Other Mechanical Properties
NA
  
Symbol
Bk
  
Cs
  
Group Number
Not Available
  
Period Number
7
  
6
  
Atomic Weight
132.91 amu
  
99+
Atomic Volume
Not Available
  
71.07 cm3/mol
  
1
Electron Configuration
[Rn] 5f9 7s2
  
[Xe] 6s1
  
Valence Electron Potential
45.50 (-eV)
  
36
8.62 (-eV)
  
99+
Atom
  
  
Crystal Lattice
DHCP-Crystal-Structure-of-Berkelium.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Radius of an Atom
  
  
Covalent Radius
Not Available
  
Van der Waals Radius
Not Available
  
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
Not Available
  
205.00 nΩ·m
  
17
Electrical Conductivity
Not Available
  
0.05 10
6/cm Ω
  
35
Electron Affinity
Not Available
  
45.50 kJ/mol
  
25
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
Not Available
  
0.24 J/(kg K)
  
23
Thermal Conductivity
10.00 W/m·K
  
99+
35.90 W/m·K
  
36
Critical Temperature
Not Available
  
Molar Heat Capacity
Not Available
  
32.21 J/mol·K
  
4
Thermal Expansion
Not Available
  
97.00 µm/(m·K)
  
1
Standard Molar Entropy
Not Available
  
85.20 J/mol.K
  
3
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
65.90 kJ/mol
  
99+
Enthalpy of Fusion
Not Available
  
2.10 kJ/mol
  
99+
Enthalpy of Atomization
Not Available
  
78.20 kJ/mol
  
99+