Properties of Iridium and Promethium
Melting Point
1,042.00 °C
  
99+
Boiling Point
4,527.00 °C
  
10
3,000.00 °C
  
31
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
1,670.00 MPa
  
5
Not Available
  
Vickers Hardness
1,760.00 MPa
  
3
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
4,825.00 m/s
  
13
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
Ir
  
Pm
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Not Available
  
Sanderson Electronegativity
Not Available
  
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Not Available
  
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol
  
9
540.00 kJ/mol
  
99+
2nd Energy Level
1,600.00 kJ/mol
  
35
1,050.00 kJ/mol
  
99+
3rd Energy Level
Not Available
  
2,150.00 kJ/mol
  
99+
Electrochemical Equivalent
1.14 g/amp-hr
  
99+
1.80 g/amp-hr
  
36
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
22.56 g/cm3
  
10
7.26 g/cm3
  
99+
Density When Liquid (at m.p.)
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
2,000.00 MPa
  
2
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
NA
  
Symbol
Ir
  
Pm
  
Group Number
Not Available
  
Period Number
6
  
6
  
Atomic Weight
145.00 amu
  
99+
Atomic Volume
9.53 cm3/mol
  
99+
22.39 cm3/mol
  
12
Electron Configuration
[Xe] 4f14 5d7 6s2
  
[Xe] 4f5 6s2
  
Valence Electron Potential
140.00 (-eV)
  
5
44.10 (-eV)
  
39
Atom
  
  
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100
  
DHCP-Crystal-Structure-of-Promethium.jpg#100
  
Radius of an Atom
  
  
Lattice Constant
Not Available
  
Lattice Angles
π/2, π/2, π/2
  
Unknown
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
47.10 nΩ·m
  
99+
Electrical Conductivity
0.19 10
6/cm Ω
  
10
Not Available
  
Electron Affinity
151.00 kJ/mol
  
4
50.00 kJ/mol
  
21
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.13 J/(kg K)
  
39
0.18 J/(kg K)
  
33
Thermal Conductivity
147.00 W/m·K
  
10
17.90 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.10 J/mol·K
  
99+
Not Available
  
Thermal Expansion
6.40 µm/(m·K)
  
99+
9.00 µm/(m·K)
  
99+
Standard Molar Entropy
35.50 J/mol.K
  
99+
Not Available
  
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol
  
1
Not Available
  
Enthalpy of Fusion
35.23 kJ/mol
  
1
7.50 kJ/mol
  
99+
Enthalpy of Atomization
837.00 kJ/mol
  
1
310.00 kJ/mol
  
34