Properties of Iron and Praseodymium
Melting Point
1,535.00 °C
  
25
Boiling Point
2,750.00 °C
  
37
3,130.00 °C
  
27
Hardness
  
  
Mohs Hardness
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
5,120.00 m/s
  
8
2,280.00 m/s
  
40
Allotropes
Yes
  
No
  
α Allotropes
Not Available
  
β Allotropes
Not Available
  
γ Allotropes
Not Available
  
Chemical Formula
Fe
  
Pr
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
762.50 kJ/mol
  
17
527.00 kJ/mol
  
99+
2nd Energy Level
1,561.90 kJ/mol
  
36
1,020.00 kJ/mol
  
99+
3rd Energy Level
2,957.00 kJ/mol
  
29
2,086.00 kJ/mol
  
99+
Electrochemical Equivalent
0.69 g/amp-hr
  
99+
1.75 g/amp-hr
  
40
Other Chemical Properties
Density
  
  
Density At Room Temperature
7.87 g/cm3
  
99+
6.77 g/cm3
  
99+
Density When Liquid (at m.p.)
Vapor Pressure
  
  
Tensile Strength
11,000.00 MPa
  
1
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
Fe
  
Pr
  
Group Number
Not Available
  
Period Number
4
  
6
  
Atomic Weight
140.91 amu
  
99+
Atomic Volume
7.10 cm3/mol
  
99+
20.80 cm3/mol
  
15
Electron Configuration
[Ar] 3d6 4s2
  
[Xe] 4f3 6s2
  
Valence Electron Potential
67.00 (-eV)
  
20
42.64 (-eV)
  
99+
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
HCP-Crystal-Structure-of-Praseodymium.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, 2 π/3
  
Lattice C/A Ratio
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Electrical Conductivity
0.10 106/cm Ω
  
20
0.01 106/cm Ω
  
99+
Electron Affinity
15.70 kJ/mol
  
34
50.00 kJ/mol
  
21
Magnetic Characteristics
  
  
Magnetic Ordering
Ferromagnetic
  
Permeability
6.3 * 10
-3 H/m
  
1
Not Available
  
Susceptibility
Not Available
  
Specific Heat
0.44 J/(kg K)
  
13
0.19 J/(kg K)
  
32
Thermal Conductivity
80.40 W/m·K
  
22
12.50 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.10 J/mol·K
  
99+
27.20 J/mol·K
  
18
Thermal Expansion
11.80 µm/(m·K)
  
33
6.70 µm/(m·K)
  
99+
Standard Molar Entropy
27.30 J/mol.K
  
99+
73.20 J/mol.K
  
10
Enthalpy
  
  
Enthalpy of Vaporization
351.00 kJ/mol
  
23
296.80 kJ/mol
  
29
Enthalpy of Fusion
14.90 kJ/mol
  
22
6.89 kJ/mol
  
99+
Enthalpy of Atomization
414.20 kJ/mol
  
19
368.00 kJ/mol
  
24