Properties of Thallium and Indium
Boiling Point
1,457.00 °C
  
99+
2,000.00 °C
  
99+
Hardness
  
  
Vickers Hardness
Not Available
  
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Not Available
  
Speed of Sound
818.00 m/s
  
99+
1,215.00 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
Tl
  
In
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
589.40 kJ/mol
  
99+
558.30 kJ/mol
  
99+
2nd Energy Level
1,971.00 kJ/mol
  
14
1,820.70 kJ/mol
  
18
3rd Energy Level
2,878.00 kJ/mol
  
32
2,704.00 kJ/mol
  
39
Electrochemical Equivalent
7.63 g/amp-hr
  
2
1.43 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
11.85 g/cm3
  
31
7.31 g/cm3
  
99+
Density When Liquid (at m.p.)
11.22 g/cm3
  
13
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available
  
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
Symbol
Tl
  
In
  
Period Number
6
  
5
  
Atomic Weight
114.82 amu
  
99+
Atomic Volume
17.20 cm3/mol
  
31
15.70 cm3/mol
  
33
Electron Configuration
[Xe] 4f14 5d10 6s2 6p1
  
[Kr] 4d10 5s2 5p1
  
Valence Electron Potential
9.60 (-eV)
  
99+
54.00 (-eV)
  
25
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
TETR-Crystal-Structure-of-Indium.jpg#100
  
Radius of an Atom
  
  
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
0.06 106/cm Ω
  
32
0.12 106/cm Ω
  
17
Electron Affinity
19.20 kJ/mol
  
32
28.90 kJ/mol
  
31
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.13 J/(kg K)
  
39
0.23 J/(kg K)
  
27
Thermal Conductivity
46.10 W/m·K
  
33
81.80 W/m·K
  
21
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
26.32 J/mol·K
  
29
26.74 J/mol·K
  
25
Thermal Expansion
29.90 µm/(m·K)
  
12
32.10 µm/(m·K)
  
9
Standard Molar Entropy
64.20 J/mol.K
  
19
57.80 J/mol.K
  
22
Enthalpy
  
  
Enthalpy of Vaporization
162.10 kJ/mol
  
99+
226.40 kJ/mol
  
40
Enthalpy of Fusion
4.27 kJ/mol
  
99+
3.28 kJ/mol
  
99+
Enthalpy of Atomization
179.90 kJ/mol
  
99+
242.70 kJ/mol
  
99+