Properties of Strontium and Niobium
Boiling Point
1,384.00 °C
  
99+
2,468.00 °C
  
99+
Hardness
  
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Not Available
  
Speed of Sound
Not Available
  
3,480.00 m/s
  
21
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Sr
  
Nb
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
549.50 kJ/mol
  
99+
652.10 kJ/mol
  
99+
2nd Energy Level
1,064.20 kJ/mol
  
99+
1,380.00 kJ/mol
  
99+
3rd Energy Level
4,138.00 kJ/mol
  
10
2,416.00 kJ/mol
  
99+
Electrochemical Equivalent
1.64 g/amp-hr
  
99+
0.69 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
2.64 g/cm3
  
99+
8.57 g/cm3
  
99+
Density When Liquid (at m.p.)
2.38 g/cm3
  
99+
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Elasticity properties
  
  
Bulk Modulus
Not Available
  
Other Mechanical Properties
NA
  
Symbol
Sr
  
Nb
  
Period Number
5
  
5
  
Atomic Volume
33.70 cm3/mol
  
6
10.87 cm3/mol
  
99+
Electron Configuration
[Kr] 5s2
  
[Kr] 4d4 5s1
  
Valence Electron Potential
25.70 (-eV)
  
99+
104.00 (-eV)
  
8
Atom
  
  
Crystal Lattice
FCC-Crystal-Structure-of-Strontium.jpg#100
  
BCC-Crystal-Structure-.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
  
Not Available
  
Adjacent Atomic Numbers
  
  
Electrical Properties
  
  
Resistivity
132.00 nΩ·m
  
24
152.00 nΩ·m
  
23
Electrical Conductivity
0.08 106/cm Ω
  
26
0.07 106/cm Ω
  
28
Electron Affinity
5.03 kJ/mol
  
38
86.10 kJ/mol
  
12
Electrical Property
NA
  
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.30 J/(kg K)
  
18
0.26 J/(kg K)
  
20
Thermal Conductivity
35.40 W/m·K
  
37
53.70 W/m·K
  
29
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
26.40 J/mol·K
  
28
24.60 J/mol·K
  
99+
Thermal Expansion
22.50 µm/(m·K)
  
18
7.30 µm/(m·K)
  
99+
Standard Molar Entropy
55.00 J/mol.K
  
26
36.40 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
150.00 kJ/mol
  
99+
696.60 kJ/mol
  
4
Enthalpy of Fusion
9.16 kJ/mol
  
38
27.20 kJ/mol
  
6
Enthalpy of Atomization
163.20 kJ/mol
  
99+
745.00 kJ/mol
  
4