Properties of Thulium and Polonium
Melting Point
1,545.00 °C
  
23
Boiling Point
1,730.00 °C
  
99+
Hardness
  
  
Mohs Hardness
Not Available
  
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Not Available
  
Speed of Sound
Not Available
  
Not Available
  
Allotropes
No
  
Yes
  
α Allotropes
Not Available
  
β Allotropes
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Tm
  
Po
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
596.70 kJ/mol
  
99+
812.10 kJ/mol
  
14
2nd Energy Level
1,160.00 kJ/mol
  
99+
Not Available
  
3rd Energy Level
2,285.00 kJ/mol
  
99+
Not Available
  
Electrochemical Equivalent
2.10 g/amp-hr
  
26
3.90 g/amp-hr
  
8
Electron Work Function
Not Available
  
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
9.20 g/cm3
  
99+
Density When Liquid (at m.p.)
Vapor Pressure
  
  
Vapor Pressure at 1000 K
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
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
NA
  
Symbol
Tm
  
Po
  
Group Number
Not Available
  
Period Number
6
  
6
  
Atomic Weight
168.93 amu
  
99+
Atomic Volume
18.10 cm3/mol
  
28
22.23 cm3/mol
  
13
Electron Configuration
[Xe] 4f13 6s2
  
[Xe] 4f14 5d10 6s2 6p4
  
Valence Electron Potential
49.70 (-eV)
  
28
Not Available
  
Atom
  
  
Crystal Lattice
HCP-Crystal-Structure-of-Thulium.jpg#100
  
MON-Crystal-Structure-of-Polonium.jpg#100
  
Radius of an Atom
  
  
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
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.02 106/cm Ω
  
99+
Electron Affinity
50.00 kJ/mol
  
21
183.30 kJ/mol
  
3
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.16 J/(kg K)
  
35
0.12 J/(kg K)
  
40
Thermal Conductivity
16.90 W/m·K
  
99+
20.00 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
27.03 J/mol·K
  
22
26.40 J/mol·K
  
28
Thermal Expansion
13.30 µm/(m·K)
  
29
23.50 µm/(m·K)
  
16
Standard Molar Entropy
74.00 J/mol.K
  
9
Not Available
  
Enthalpy
  
  
Enthalpy of Vaporization
191.00 kJ/mol
  
99+
60.30 kJ/mol
  
99+
Enthalpy of Fusion
16.80 kJ/mol
  
17
13.00 kJ/mol
  
26
Enthalpy of Atomization
247.00 kJ/mol
  
99+
134.00 kJ/mol
  
99+