Properties of Iron and Gold
Melting Point
1,535.00 °C
  
25
1,064.43 °C
  
99+
Boiling Point
2,750.00 °C
  
37
2,807.00 °C
  
36
Hardness
  
  
Brinell Hardness
194.00 MPa
  
99+
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Speed of Sound
5,120.00 m/s
  
8
2,030.00 m/s
  
99+
Allotropes
Yes
  
No
  
α Allotropes
Not Available
  
β Allotropes
Not Available
  
γ Allotropes
Not Available
  
Chemical Formula
Fe
  
Au
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
762.50 kJ/mol
  
17
890.10 kJ/mol
  
8
2nd Energy Level
1,561.90 kJ/mol
  
36
1,980.00 kJ/mol
  
12
3rd Energy Level
2,957.00 kJ/mol
  
29
Not Available
  
Electrochemical Equivalent
0.69 g/amp-hr
  
99+
2.45 g/amp-hr
  
21
Other Chemical Properties
Density
  
  
Density At Room Temperature
7.87 g/cm3
  
99+
19.30 g/cm3
  
15
Density When Liquid (at m.p.)
Vapor Pressure
  
  
Tensile Strength
11,000.00 MPa
  
1
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Symbol
Fe
  
Au
  
Period Number
4
  
6
  
Atomic Volume
7.10 cm3/mol
  
99+
10.20 cm3/mol
  
99+
Electron Configuration
[Ar] 3d6 4s2
  
[Xe] 4f14 5d10 6s1
  
Valence Electron Potential
67.00 (-eV)
  
20
43.40 (-eV)
  
99+
Atom
  
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
FCC-Crystal-Structure-of-Gold.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Electrical Conductivity
0.10 106/cm Ω
  
20
0.45 106/cm Ω
  
3
Electron Affinity
15.70 kJ/mol
  
34
222.80 kJ/mol
  
1
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
0.13 J/(kg K)
  
39
Thermal Conductivity
80.40 W/m·K
  
22
318.00 W/m·K
  
3
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.10 J/mol·K
  
99+
25.42 J/mol·K
  
40
Thermal Expansion
11.80 µm/(m·K)
  
33
14.20 µm/(m·K)
  
26
Standard Molar Entropy
27.30 J/mol.K
  
99+
47.40 J/mol.K
  
32
Enthalpy
  
  
Enthalpy of Vaporization
351.00 kJ/mol
  
23
324.40 kJ/mol
  
27
Enthalpy of Fusion
14.90 kJ/mol
  
22
12.55 kJ/mol
  
27
Enthalpy of Atomization
414.20 kJ/mol
  
19
364.00 kJ/mol
  
25