Properties of Platinum and Promethium
Melting Point
1,772.00 °C
  
16
1,042.00 °C
  
99+
Boiling Point
3,827.00 °C
  
15
3,000.00 °C
  
31
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
2,800.00 m/s
  
29
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
Pt
  
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
870.00 kJ/mol
  
10
540.00 kJ/mol
  
99+
2nd Energy Level
1,791.00 kJ/mol
  
21
1,050.00 kJ/mol
  
99+
3rd Energy Level
Not Available
  
2,150.00 kJ/mol
  
99+
Electrochemical Equivalent
1.82 g/amp-hr
  
35
1.80 g/amp-hr
  
36
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
21.45 g/cm3
  
11
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
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
Symbol
Pt
  
Pm
  
Group Number
Not Available
  
Period Number
6
  
6
  
Atomic Weight
145.00 amu
  
99+
Atomic Volume
9.09 cm3/mol
  
99+
22.39 cm3/mol
  
12
Electron Configuration
[Xe] 4f14 5d9 6s1
  
[Xe] 4f5 6s2
  
Valence Electron Potential
392.42 (-eV)
  
1
44.10 (-eV)
  
39
Atom
  
  
Crystal Lattice
FCC-Crystal-Structure-of-Platinum.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
105.00 nΩ·m
  
30
Electrical Conductivity
0.10 10
6/cm Ω
  
21
Not Available
  
Electron Affinity
205.30 kJ/mol
  
2
50.00 kJ/mol
  
21
Magnetic Characteristics
  
  
Permeability
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.13 J/(kg K)
  
39
0.18 J/(kg K)
  
33
Thermal Conductivity
71.60 W/m·K
  
24
17.90 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.86 J/mol·K
  
35
Not Available
  
Thermal Expansion
8.80 µm/(m·K)
  
99+
9.00 µm/(m·K)
  
99+
Standard Molar Entropy
41.60 J/mol.K
  
36
Not Available
  
Enthalpy
  
  
Enthalpy of Vaporization
510.50 kJ/mol
  
11
Not Available
  
Enthalpy of Fusion
19.70 kJ/mol
  
12
7.50 kJ/mol
  
99+
Enthalpy of Atomization
565.00 kJ/mol
  
11
310.00 kJ/mol
  
34