Symbol
Rh
  
Bh
  
Period Number
5
  
7
  
Block
d block
  
d block
  
Element Family
Transition Metal
  
Transition Metal
  
Space Group Name
Fm_ 3m
  
Not Available
  
Space Group Number
Not Available
  
Interesting Facts
- Rhodium is the rarest element out of all non-radioactive metals on the earth .
- Rhodium is one of the most durable and hard metal, which also have high reflectance.
  
- Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
  
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining
  
Found in Minerals, Mining, Synthetically Produced
  
History
  
  
Who Discovered
William Hyde Wollaston
  
Gesellschaft für Schwerionenforschung
  
Discovery
In 1804
  
In 1981
  
Abundance
  
  
Abundance In Universe
Not Available
  
Abundance In Sun
~0.0000002 %
  
25
~-9999 %
  
Abundance In Meteorites
Not Available
  
Abundance In Earth's Crust
Not Available
  
Uses & Benefits
- Rhodium metal is mainly used in catalytic converters for cars as it reduces nitrogen oxides in exhaust gases.
- It is used as an industrial catalyst for nitric acid, acetic acid, hydrogenation reaction, etc.
  
- Currently known uses of Bohrium metal are limited to research purpose only.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
  
NA
  
Medical Uses
NA
  
NA
  
Other Uses
Alloys
  
Research Purposes
  
Biological Properties
  
  
Toxicity
NA
  
Unknown
  
Present in Human Body
No
  
No
  
In Blood
Not Available
  
0.00 Blood/mg dm-3
  
37
In Bone
Not Available
  
0.00 p.p.m.
  
36
Melting Point
1,966.00 °C
  
12
Not Available
  
Boiling Point
3,727.00 °C
  
17
Not Available
  
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery White
  
Unknown
  
Luster
Metallic
  
Unknown Luster
  
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
1,100.00 MPa
  
9
Not Available
  
Speed of Sound
4,700.00 m/s
  
15
Not Available
  
Optical Properties
  
  
Reflectivity
Not Available
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Rh
  
Bh
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Not Available
  
Allred Rochow Electronegativity
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Not Available
  
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol
  
29
742.90 kJ/mol
  
23
2nd Energy Level
1,740.00 kJ/mol
  
26
1,688.50 kJ/mol
  
30
3rd Energy Level
2,997.00 kJ/mol
  
27
2,566.50 kJ/mol
  
99+
4th Energy Level
Not Available
  
3,598.90 kJ/mol
  
99+
5th Energy Level
Not Available
  
4,727.80 kJ/mol
  
37
6th Energy Level
Not Available
  
5,991.70 kJ/mol
  
24
7th Energy level
Not Available
  
7,226.80 kJ/mol
  
22
Electrochemical Equivalent
1.28 g/amp-hr
  
99+
Not Available
  
Electron Work Function
Not Available
  
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes
  
Ionization, Radioactive Isotopes
  
Electron Configuration
[Kr] 4d8 5s1
  
[Rn] 5f14 6d5 7s2
  
Crystal Structure
Face Centered Cubic (FCC)
  
Hexagonal Close Packed (HCP)
  
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Van der Waals Radius
Not Available
  
Atomic Weight
102.91 amu
  
99+
Atomic Volume
8.30 cm3/mol
  
99+
Not Available
  
Adjacent Atomic Numbers
  
  
Valence Electron Potential
64.00 (-eV)
  
22
Not Available
  
Lattice Constant
Not Available
  
Lattice Angles
π/2, π/2, π/2
  
NA
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Density
  
  
Density At Room Temperature
12.41 g/cm3
  
28
Density When Liquid (at m.p.)
10.70 g/cm3
  
14
Not Available
  
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
Malleable
  
Unknown
  
Magnetic Characteristics
  
  
Specific Gravity
Not Available
  
Magnetic Ordering
Paramagnetic
  
Unknown
  
Electrical Properties
  
  
Electrical Property
Conductor
  
Unknown
  
Resistivity
43.30 nΩ·m
  
99+
Not Available
  
Electrical Conductivity
0.21 10
6/cm Ω
  
8
Not Available
  
Electron Affinity
109.70 kJ/mol
  
7
Not Available
  
Specific Heat
0.24 J/(kg K)
  
22
Not Available
  
Molar Heat Capacity
24.98 J/mol·K
  
99+
Not Available
  
Thermal Conductivity
150.00 W/m·K
  
9
Not Available
  
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
8.20 µm/(m·K)
  
99+
Not Available
  
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol
  
12
Not Available
  
Enthalpy of Fusion
21.76 kJ/mol
  
10
Not Available
  
Enthalpy of Atomization
556.50 kJ/mol
  
12
Not Available
  
Standard Molar Entropy
31.50 J/mol.K
  
99+
Not Available