Properties of Calcium and Rhodium
Melting Point
1,966.00 °C
  
12
Boiling Point
1,484.00 °C
  
99+
3,727.00 °C
  
17
Hardness
  
  
Brinell Hardness
170.00 MPa
  
99+
Vickers Hardness
Not Available
  
1,100.00 MPa
  
9
Optical Properties
  
  
Refractive Index
Not Available
  
Not Available
  
Reflectivity
Not Available
  
Speed of Sound
3,810.00 m/s
  
19
4,700.00 m/s
  
15
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Ca
  
Rh
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
589.80 kJ/mol
  
99+
719.70 kJ/mol
  
29
2nd Energy Level
1,145.40 kJ/mol
  
99+
1,740.00 kJ/mol
  
26
3rd Energy Level
4,912.40 kJ/mol
  
7
2,997.00 kJ/mol
  
27
Electrochemical Equivalent
0.75 g/amp-hr
  
99+
1.28 g/amp-hr
  
99+
Other Chemical Properties
Density
  
  
Density At Room Temperature
1.55 g/cm3
  
99+
12.41 g/cm3
  
28
Density When Liquid (at m.p.)
1.38 g/cm3
  
99+
10.70 g/cm3
  
14
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
  
  
Other Mechanical Properties
NA
  
Symbol
Ca
  
Rh
  
Period Number
4
  
5
  
Atomic Weight
102.91 amu
  
99+
Atomic Volume
29.90 cm3/mol
  
7
8.30 cm3/mol
  
99+
Electron Configuration
[Ar] 4s2
  
[Kr] 4d8 5s1
  
Valence Electron Potential
29.00 (-eV)
  
99+
64.00 (-eV)
  
22
Atom
  
  
Crystal Lattice
FCC-Crystal-Structure-of-Calcium.jpg#100
  
FCC-Crystal-Structure-of-Rhodium.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
33.60 nΩ·m
  
99+
43.30 nΩ·m
  
99+
Electrical Conductivity
0.30 106/cm Ω
  
6
0.21 106/cm Ω
  
8
Electron Affinity
2.37 kJ/mol
  
39
109.70 kJ/mol
  
7
Magnetic Characteristics
  
  
Permeability
Not Available
  
Not Available
  
Susceptibility
Not Available
  
Not Available
  
Specific Heat
0.63 J/(kg K)
  
7
0.24 J/(kg K)
  
22
Thermal Conductivity
201.00 W/m·K
  
5
150.00 W/m·K
  
9
Critical Temperature
Not Available
  
Not Available
  
Molar Heat Capacity
25.93 J/mol·K
  
34
24.98 J/mol·K
  
99+
Thermal Expansion
22.30 µm/(m·K)
  
19
8.20 µm/(m·K)
  
99+
Standard Molar Entropy
41.60 J/mol.K
  
36
31.50 J/mol.K
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
150.00 kJ/mol
  
99+
495.40 kJ/mol
  
12
Enthalpy of Fusion
8.54 kJ/mol
  
99+
21.76 kJ/mol
  
10
Enthalpy of Atomization
184.00 kJ/mol
  
99+
556.50 kJ/mol
  
12