Properties of Neodymium and Holmium
Melting Point
1,010.00 °C
  
99+
1,461.00 °C
  
30
Boiling Point
3,127.00 °C
  
28
2,600.00 °C
  
99+
Hardness
  
  
Mohs Hardness
Not Available
  
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Not Available
  
Speed of Sound
2,330.00 m/s
  
38
2,760.00 m/s
  
30
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Nd
  
Ho
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Not Available
  
Allen Electronegativity
Not Available
  
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
533.10 kJ/mol
  
99+
581.00 kJ/mol
  
99+
2nd Energy Level
1,040.00 kJ/mol
  
99+
1,140.00 kJ/mol
  
99+
3rd Energy Level
2,130.00 kJ/mol
  
99+
2,204.00 kJ/mol
  
99+
Electrochemical Equivalent
1.79 g/amp-hr
  
37
2.02 g/amp-hr
  
29
Electron Work Function
Not Available
  
Other Chemical Properties
Density
  
  
Density At Room Temperature
7.01 g/cm3
  
99+
8.79 g/cm3
  
99+
Density When Liquid (at m.p.)
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
Symbol
Nd
  
Ho
  
Group Number
Not Available
  
Period Number
6
  
6
  
Atomic Weight
144.24 amu
  
99+
164.93 amu
  
99+
Atomic Volume
20.60 cm3/mol
  
18
18.70 cm3/mol
  
24
Electron Configuration
[Xe] 4f4 6s2
  
[Xe] 4f11 6s2
  
Valence Electron Potential
43.40 (-eV)
  
99+
47.90 (-eV)
  
31
Atom
  
  
Crystal Lattice
DHCP-Crystal-Structure-of-Neodymium.jpg#100
  
HCP-Crystal-Structure-of-Holmium.jpg#100
  
Radius of an Atom
  
  
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, 2 π/3
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Electrical Conductivity
0.02 106/cm Ω
  
99+
0.01 106/cm Ω
  
99+
Electron Affinity
50.00 kJ/mol
  
21
50.00 kJ/mol
  
21
Electrical Property
NA
  
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.19 J/(kg K)
  
32
0.16 J/(kg K)
  
35
Thermal Conductivity
16.50 W/m·K
  
99+
16.20 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
27.45 J/mol·K
  
17
27.15 J/mol·K
  
19
Thermal Expansion
9.60 µm/(m·K)
  
99+
11.20 µm/(m·K)
  
35
Standard Molar Entropy
71.50 J/mol.K
  
13
75.30 J/mol.K
  
8
Enthalpy
  
  
Enthalpy of Vaporization
273.00 kJ/mol
  
34
241.00 kJ/mol
  
38
Enthalpy of Fusion
7.14 kJ/mol
  
99+
11.76 kJ/mol
  
29
Enthalpy of Atomization
322.00 kJ/mol
  
32
301.00 kJ/mol
  
36