Properties of Osmium and Platinum
Melting Point
1,772.00 °C
  
16
Boiling Point
3,827.00 °C
  
15
Hardness
  
  
Brinell Hardness
3,490.00 MPa
  
1
Vickers Hardness
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
4,940.00 m/s
  
11
2,800.00 m/s
  
29
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Os
  
Pt
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
840.00 kJ/mol
  
12
870.00 kJ/mol
  
10
2nd Energy Level
1,309.80 kJ/mol
  
99+
1,791.00 kJ/mol
  
21
3rd Energy Level
1,600.00 kJ/mol
  
99+
Not Available
  
Electrochemical Equivalent
1.77 g/amp-hr
  
38
1.82 g/amp-hr
  
35
Other Chemical Properties
Density
  
  
Density At Room Temperature
21.45 g/cm3
  
11
Density When Liquid (at m.p.)
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Not Available
  
Tensile Strength
1,000.00 MPa
  
4
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Young's Modulus
Not Available
  
Other Mechanical Properties
Symbol
Os
  
Pt
  
Period Number
6
  
6
  
Atomic Volume
8.49 cm3/mol
  
99+
9.09 cm3/mol
  
99+
Electron Configuration
[Xe] 4f14 5d6 6s2
  
[Xe] 4f14 5d9 6s1
  
Valence Electron Potential
91.40 (-eV)
  
12
392.42 (-eV)
  
1
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
FCC-Crystal-Structure-of-Platinum.jpg#100
  
Radius of an Atom
  
  
Covalent 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
  
  
Resistivity
105.00 nΩ·m
  
30
Electrical Conductivity
0.11 106/cm Ω
  
18
0.10 106/cm Ω
  
21
Electron Affinity
106.10 kJ/mol
  
9
205.30 kJ/mol
  
2
Magnetic Characteristics
  
  
Permeability
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.13 J/(kg K)
  
39
0.13 J/(kg K)
  
39
Thermal Conductivity
87.60 W/m·K
  
19
71.60 W/m·K
  
24
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
24.70 J/mol·K
  
99+
25.86 J/mol·K
  
35
Thermal Expansion
5.10 µm/(m·K)
  
99+
8.80 µm/(m·K)
  
99+
Standard Molar Entropy
32.60 J/mol.K
  
99+
41.60 J/mol.K
  
36
Enthalpy
  
  
Enthalpy of Vaporization
627.60 kJ/mol
  
7
510.50 kJ/mol
  
11
Enthalpy of Fusion
29.30 kJ/mol
  
4
19.70 kJ/mol
  
12
Enthalpy of Atomization
669.00 kJ/mol
  
6
565.00 kJ/mol
  
11