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Properties of Platinum and Rhodium

Platinum
Rhodium
Properties of Rhodium & Platinum


Physical Properties
Melting Point
1,772.00 °C   
16
1,966.00 °C   
12
Boiling Point
3,827.00 °C   
15
3,727.00 °C   
17
Hardness
  
  
Mohs Hardness
3.50   
11
6.00   
6
Brinell Hardness
300.00 MPa   
34
980.00 MPa   
9
Vickers Hardness
400.00 MPa   
25
1,100.00 MPa   
9
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
73.00 %   
8
84.00 %   
4
Speed of Sound
2,800.00 m/s   
29
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 Properties
Chemical Formula
Pt   
Rh   
Isotopes
  
  
Known Isotopes
35   
4
16   
23
Electronegativity
  
  
Pauling Electronegativity
2.28   
3
2.28   
3
Sanderson Electronegativity
Not Available   
Not Available   
Allred Rochow Electronegativity
1.44   
17
1.45   
16
Mulliken-Jaffe Electronegativity
Not Available   
Not Available   
Allen Electronegativity
1.72   
16
1.56   
24
Electropositivity
  
  
Pauling Electropositivity
1.72   
99+
1.72   
99+
Ionization Energies
  
  
1st Energy Level
870.00 kJ/mol   
10
719.70 kJ/mol   
29
2nd Energy Level
1,791.00 kJ/mol   
21
1,740.00 kJ/mol   
26
3rd Energy Level
Not Available   
2,997.00 kJ/mol   
27
Electrochemical Equivalent
1.82 g/amp-hr   
35
1.28 g/amp-hr   
99+
Electron Work Function
5.65 eV   
1
4.98 eV   
6
Other Chemical Properties
?
Stable metals are non radioactive metals and have zero valence electrons in the outer shell.Chemical Stability, 
?
Anti-corrosion metals have the protection on their surfaces which protect them from corroding in corrosive environments.Anti Corrosion, 
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization   
?
Anti-corrosion metals have the protection on their surfaces which protect them from corroding in corrosive environments.Anti Corrosion, 
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes   
Mechanical Properties
Density
  
  
Density At Room Temperature
21.45 g/cm3   
11
12.41 g/cm3   
28
Density When Liquid (at m.p.)
19.77 g/cm3   
2
10.70 g/cm3   
14
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
Not Available   
Vapor Pressure at 2000 K
0.07 (Pa)   
18
0.02 (Pa)   
19
Tensile Strength
125.00 MPa   
14
951.00 MPa   
5
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
61.00 GPa   
14
150.00 GPa   
6
Bulk Modulus
230.00 GPa   
6
275.00 GPa   
5
Young's Modulus
168.00 GPa   
14
380.00 GPa   
5
Poisson Ratio
0.38   
6
0.26   
22
Other Mechanical Properties
?
Ductility of metals defines their ability to deform under tensile stress; this is often characterized by the metals ability to be stretched into a wire.Ductile, 
?
Malleability of metals defines their ability to deform under compressive stress; this is often characterized by the metals ability to form a thin sheet by hammering or rolling.Malleable   
?
Malleability of metals defines their ability to deform under compressive stress; this is often characterized by the metals ability to form a thin sheet by hammering or rolling.Malleable   
Periodic Table
Symbol
Pt   
Rh   
Group Number
10   
8
9   
9
Period Number
6   
5   
Block
?
The d-block is on the middle of the periodic table and includes elements from columns 3 through 12. These elements are also known as the transition metals because they show a transitivity in their properties i.e. they show a trend in their properties.d block   
?
The d-block is on the middle of the periodic table and includes elements from columns 3 through 12. These elements are also known as the transition metals because they show a transitivity in their properties i.e. they show a trend in their properties.d block   
Element Family
?
What is Transition Metal? All transition metals are placed under the d-block from group number 3 to 12. Transition metals show characteristics like malleability, ductility and are good conductor of electricity.Transition Metal   
?
What is Transition Metal? All transition metals are placed under the d-block from group number 3 to 12. Transition metals show characteristics like malleability, ductility and are good conductor of electricity.Transition Metal   
Atomic Properties
Atomic Number
78   
38
45   
99+
Atomic Weight
47.87 amu   
99+
102.91 amu   
99+
Atomic Volume
9.09 cm3/mol   
99+
8.30 cm3/mol   
99+
Electron Configuration
[Xe] 4f14 5d9 6s1   
[Kr] 4d8 5s1   
Valence Electron Potential
392.42 (-eV)   
1
64.00 (-eV)   
22
Atom
  
  
Number of Protons
78   
38
45   
99+
Number of Neutrons
117   
24
58   
99+
Number of Electrons
78   
38
45   
99+
Crystal Structure
?
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals.Face Centered Cubic (FCC)   
?
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals.Face Centered Cubic (FCC)   
Crystal Lattice
FCC-Crystal-Structure-of-Platinum.jpg#100   
FCC-Crystal-Structure-of-Rhodium.jpg#100   
Radius of an Atom
  
  
Atomic Radius
139.00 pm   
39
134.00 pm   
99+
Covalent Radius
136.00 pm   
99+
142.00 pm   
99+
Van der Waals Radius
175.00 pm   
36
200.00 pm   
28
Lattice Constant
392.42 pm   
24
380.34 pm   
27
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
  
  
Next Element
Gold
  
Palladium
  
Previous Element
Iridium
  
Ruthenium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
105.00 nΩ·m   
30
43.30 nΩ·m   
99+
Electrical Conductivity
0.10 106/cm Ω   
21
0.21 106/cm Ω   
8
Electron Affinity
205.30 kJ/mol   
2
109.70 kJ/mol   
7
Electrical Property
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
Magnetic Characteristics
  
  
Specific Gravity
21.45   
4
12.41   
20
Magnetic Ordering
?
Paramagnetic metals are slightly attracted by magnet, but they can’t retain the magnetic effect once they are removed from the magnetic field.Paramagnetic   
?
Paramagnetic metals are slightly attracted by magnet, but they can’t retain the magnetic effect once they are removed from the magnetic field.Paramagnetic   
Permeability
0.00 H/m   
3
Not Available   
Susceptibility
Not Available   
Not Available   
Thermal Properties
Specific Heat
0.13 J/(kg K)   
39
0.24 J/(kg K)   
22
Thermal Conductivity
71.60 W/m·K   
24
150.00 W/m·K   
9
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
25.86 J/mol·K   
35
24.98 J/mol·K   
99+
Thermal Expansion
8.80 µm/(m·K)   
99+
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
510.50 kJ/mol   
11
495.40 kJ/mol   
12
Enthalpy of Fusion
19.70 kJ/mol   
12
21.76 kJ/mol   
10
Enthalpy of Atomization
565.00 kJ/mol   
11
556.50 kJ/mol   
12
All >>
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