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Niobium vs Rhodium

Niobium
Rhodium
Rhodium vs Niobium


Periodic Table
Symbol
Nb   
Rh   
Group Number
5   
13
9   
9
Period Number
5   
5   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440031   
99+
7440166   
99+
Space Group Name
Im_ 3m   
Fm_ 3m   
Space Group Number
229.00   
1
225.00   
2
Facts
Interesting Facts
  • Niobium metal was used to get called Columbium in past.
  • Niobium metal found freely in nature (abundance).
  
  • 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.
  
Sources
By-product of Tin Extraction, Found in Minerals, Mining, Ores of Minerals   
Earth's crust, Found As a By-product, Found in Minerals, Mining   
History
  
  
Who Discovered
Charles Hatchett   
William Hyde Wollaston   
Discovery
In 1801   
In 1804   
Abundance
  
  
Abundance In Universe
2 * 10-7 %   
22
6 * 10-8 %   
26
Abundance In Sun
~0.0000004 %   
23
~0.0000002 %   
25
Abundance In Meteorites
0.00 %   
35
0.00 %   
36
Abundance In Earth's Crust
0.00 %   
25
0.00 %   
99+
Abundance In Oceans
0.00 %   
34
Not Available   
Uses
Uses & Benefits
  • Niobium alloys are used in jet engines and rockets and spacecraft, beams and girders for buildings and oil and gas pipelines.
  • It is used superconducting magnets in particles accelerators, NMR and MRI equipment.
  
  • 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.
  
Industrial Uses
Aerospace Industry, Ammunition Industry, Electrical Industry, Electronic Industry   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Low Toxic   
NA   
Present in Human Body
Yes   
No   
In Blood
0.01 Blood/mg dm-3   
25
Not Available   
In Bone
0.07 p.p.m.   
25
Not Available   
Physical Properties
Melting Point
2,468.00 °C   
6
1,966.00 °C   
12
Boiling Point
2,468.00 °C   
99+
3,727.00 °C   
17
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Silvery White   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
6.00   
6
6.00   
6
Brinell Hardness
735.00 MPa   
14
980.00 MPa   
9
Vickers Hardness
870.00 MPa   
12
1,100.00 MPa   
9
Speed of Sound
3,480.00 m/s   
21
4,700.00 m/s   
15
Optical Properties
  
  
Reflectivity
Not Available   
84.00 %   
4
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
Nb   
Rh   
Isotopes
  
  
Known Isotopes
17   
22
16   
23
Electronegativity
  
  
Pauling Electronegativity
1.60   
23
2.28   
3
Sanderson Electronegativity
1.42   
16
Not Available   
Allred Rochow Electronegativity
1.23   
25
1.45   
16
Allen Electronegativity
1.41   
31
1.56   
24
Electropositivity
  
  
Pauling Electropositivity
2.40   
31
1.72   
99+
Ionization Energies
  
  
1st Energy Level
652.10 kJ/mol   
99+
719.70 kJ/mol   
29
2nd Energy Level
1,380.00 kJ/mol   
99+
1,740.00 kJ/mol   
26
3rd Energy Level
2,416.00 kJ/mol   
99+
2,997.00 kJ/mol   
27
4th Energy Level
3,700.00 kJ/mol   
99+
Not Available   
5th Energy Level
4,877.00 kJ/mol   
36
Not Available   
6th Energy Level
9,847.00 kJ/mol   
11
Not Available   
7th Energy level
12,100.00 kJ/mol   
14
Not Available   
Electrochemical Equivalent
0.69 g/amp-hr   
99+
1.28 g/amp-hr   
99+
Electron Work Function
4.30 eV   
18
4.98 eV   
6
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
41   
99+
45   
99+
Electron Configuration
[Kr] 4d4 5s1   
[Kr] 4d8 5s1   
Crystal Structure
Body Centered Cubic (BCC)   
Face Centered Cubic (FCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
FCC-Crystal-Structure-of-Rhodium.jpg#100   
Atom
  
  
Number of Protons
41   
99+
45   
99+
Number of Neutrons
52   
99+
58   
99+
Number of Electrons
41   
99+
45   
99+
Radius of an Atom
  
  
Atomic Radius
146.00 pm   
35
134.00 pm   
99+
Covalent Radius
164.00 pm   
28
142.00 pm   
99+
Van der Waals Radius
200.00 pm   
28
200.00 pm   
28
Atomic Weight
92.91 amu   
99+
102.91 amu   
99+
Atomic Volume
10.87 cm3/mol   
99+
8.30 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Zirconium
  
Ruthenium
  
Next Element
Molybdenum
  
Palladium
  
Valence Electron Potential
104.00 (-eV)   
8
64.00 (-eV)   
22
Lattice Constant
330.04 pm   
99+
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   
Mechanical Properties
Density
  
  
Density At Room Temperature
8.57 g/cm3   
99+
12.41 g/cm3   
28
Density When Liquid (at m.p.)
Not Available   
10.70 g/cm3   
14
Tensile Strength
330.00 MPa   
12
951.00 MPa   
5
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.00 (Pa)   
27
0.02 (Pa)   
19
Elasticity properties
  
  
Shear Modulus
38.00 GPa   
19
150.00 GPa   
6
Bulk Modulus
170.00 GPa   
10
275.00 GPa   
5
Young's Modulus
105.00 GPa   
20
380.00 GPa   
5
Poisson Ratio
0.40   
4
0.26   
22
Other Mechanical Properties
Ductile, Malleable   
Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
8.57   
37
12.41   
20
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
152.00 nΩ·m   
23
43.30 nΩ·m   
99+
Electrical Conductivity
0.07 106/cm Ω   
28
0.21 106/cm Ω   
8
Electron Affinity
86.10 kJ/mol   
12
109.70 kJ/mol   
7
Thermal Properties
Specific Heat
0.26 J/(kg K)   
20
0.24 J/(kg K)   
22
Molar Heat Capacity
24.60 J/mol·K   
99+
24.98 J/mol·K   
99+
Thermal Conductivity
53.70 W/m·K   
29
150.00 W/m·K   
9
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
7.30 µm/(m·K)   
99+
8.20 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
696.60 kJ/mol   
4
495.40 kJ/mol   
12
Enthalpy of Fusion
27.20 kJ/mol   
6
21.76 kJ/mol   
10
Enthalpy of Atomization
745.00 kJ/mol   
4
556.50 kJ/mol   
12
Standard Molar Entropy
36.40 J/mol.K   
99+
31.50 J/mol.K   
99+
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