Properties of Yttrium and Thallium
Melting Point
1,523.00 °C
  
27
Boiling Point
3,337.00 °C
  
21
1,457.00 °C
  
99+
Hardness
  
  
Mohs 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
3,300.00 m/s
  
23
818.00 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
Y
  
Tl
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
600.00 kJ/mol
  
99+
589.40 kJ/mol
  
99+
2nd Energy Level
1,180.00 kJ/mol
  
99+
1,971.00 kJ/mol
  
14
3rd Energy Level
1,980.00 kJ/mol
  
99+
2,878.00 kJ/mol
  
32
Electrochemical Equivalent
1.11 g/amp-hr
  
99+
7.63 g/amp-hr
  
2
Other Chemical Properties
Density
  
  
Density At Room Temperature
4.47 g/cm3
  
99+
11.85 g/cm3
  
31
Density When Liquid (at m.p.)
4.24 g/cm3
  
99+
11.22 g/cm3
  
13
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
Y
  
Tl
  
Period Number
5
  
6
  
Atomic Volume
19.80 cm3/mol
  
21
17.20 cm3/mol
  
31
Electron Configuration
[Kr] 4d1 5s2
  
[Xe] 4f14 5d10 6s2 6p1
  
Valence Electron Potential
48.00 (-eV)
  
30
9.60 (-eV)
  
99+
Atom
  
  
Crystal Lattice
HCP-Crystal-Structure-of-Yttrium.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, 2 π/3
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.06 106/cm Ω
  
32
Electron Affinity
29.60 kJ/mol
  
30
19.20 kJ/mol
  
32
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.30 J/(kg K)
  
18
0.13 J/(kg K)
  
39
Thermal Conductivity
17.20 W/m·K
  
99+
46.10 W/m·K
  
33
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
26.53 J/mol·K
  
27
26.32 J/mol·K
  
29
Thermal Expansion
10.60 µm/(m·K)
  
37
29.90 µm/(m·K)
  
12
Standard Molar Entropy
44.40 J/mol.K
  
33
64.20 J/mol.K
  
19
Enthalpy
  
  
Enthalpy of Vaporization
393.00 kJ/mol
  
18
162.10 kJ/mol
  
99+
Enthalpy of Fusion
17.15 kJ/mol
  
16
4.27 kJ/mol
  
99+
Enthalpy of Atomization
418.00 kJ/mol
  
18
179.90 kJ/mol
  
99+