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Lanthanum Rhodium Comparison

Lanthanum
Rhodium
Rhodium Lanthanum comparison


Periodic Table
Symbol
La   
Rh   
Group Number
Not Available   
9   
9
Period Number
6   
5   
Block
f block   
d block   
Element Family
Lanthanide   
Transition Metal   
CAS Number
7439910   
99+
7440166   
99+
Space Group Name
P63/mmc   
Fm_ 3m   
Space Group Number
194.00   
5
225.00   
2
Facts
Interesting Facts
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
  
  • 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
Found in Minerals, Mining, Ores of Minerals   
Earth's crust, Found As a By-product, Found in Minerals, Mining   
History
  
  
Who Discovered
Carl Gustaf Mosander   
William Hyde Wollaston   
Discovery
In 1838   
In 1804   
Abundance
  
  
Abundance In Universe
2 * 10-7 %   
22
6 * 10-8 %   
26
Abundance In Sun
~0.0000002 %   
25
~0.0000002 %   
25
Abundance In Meteorites
0.00 %   
32
0.00 %   
36
Abundance In Earth's Crust
0.00 %   
19
0.00 %   
99+
Abundance In Oceans
0.00 %   
29
Not Available   
Uses
Uses & Benefits
  • It has no commercial uses, but its alloys are in high demand. Lanthanum and Nickel alloy is used for the hydrogen gas storage.
  • The best-known use for mischmetal alloy of Lanthanum is; as a ‘flints’ for cigarette lighters.
  
  • 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
Electrical Industry, Electronic Industry   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Mirror Manufacturing   
Alloys   
Biological Properties
  
  
Toxicity
Low Toxic   
NA   
Present in Human Body
Yes   
No   
In Bone
0.08 p.p.m.   
24
Not Available   
Physical Properties
Melting Point
920.00 °C   
99+
1,966.00 °C   
12
Boiling Point
3,469.00 °C   
18
3,727.00 °C   
17
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery White   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
2.50   
14
6.00   
6
Brinell Hardness
350.00 MPa   
30
980.00 MPa   
9
Vickers Hardness
360.00 MPa   
26
1,100.00 MPa   
9
Speed of Sound
2,475.00 m/s   
37
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
La   
Rh   
Isotopes
  
  
Known Isotopes
31   
8
16   
23
Electronegativity
  
  
Pauling Electronegativity
1.10   
99+
2.28   
3
Allred Rochow Electronegativity
1.08   
31
1.45   
16
Allen Electronegativity
Not Available   
1.56   
24
Electropositivity
  
  
Pauling Electropositivity
2.90   
10
1.72   
99+
Ionization Energies
  
  
1st Energy Level
538.10 kJ/mol   
99+
719.70 kJ/mol   
29
2nd Energy Level
1,067.00 kJ/mol   
99+
1,740.00 kJ/mol   
26
3rd Energy Level
1,850.30 kJ/mol   
99+
2,997.00 kJ/mol   
27
4th Energy Level
4,819.00 kJ/mol   
22
Not Available   
5th Energy Level
5,940.00 kJ/mol   
25
Not Available   
Electrochemical Equivalent
1.73 g/amp-hr   
99+
1.28 g/amp-hr   
99+
Electron Work Function
3.50 eV   
31
4.98 eV   
6
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
57   
99+
45   
99+
Electron Configuration
[Xe] 5d2 6s2   
[Kr] 4d8 5s1   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Face Centered Cubic (FCC)   
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   
FCC-Crystal-Structure-of-Rhodium.jpg#100   
Atom
  
  
Number of Protons
57   
99+
45   
99+
Number of Neutrons
82   
99+
58   
99+
Number of Electrons
57   
99+
45   
99+
Radius of an Atom
  
  
Atomic Radius
187.00 pm   
8
134.00 pm   
99+
Covalent Radius
207.00 pm   
6
142.00 pm   
99+
Van der Waals Radius
240.00 pm   
13
200.00 pm   
28
Atomic Weight
138.91 amu   
99+
102.91 amu   
99+
Atomic Volume
20.73 cm3/mol   
16
8.30 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Barium
  
Ruthenium
  
Next Element
Cerium
  
Palladium
  
Valence Electron Potential
40.71 (-eV)   
99+
64.00 (-eV)   
22
Lattice Constant
377.20 pm   
28
380.34 pm   
27
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
1.62   
2
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
6.16 g/cm3   
99+
12.41 g/cm3   
28
Density When Liquid (at m.p.)
5.94 g/cm3   
99+
10.70 g/cm3   
14
Tensile Strength
Not Available   
951.00 MPa   
5
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.98 (Pa)   
15
0.02 (Pa)   
19
Elasticity properties
  
  
Shear Modulus
14.30 GPa   
40
150.00 GPa   
6
Bulk Modulus
27.90 GPa   
99+
275.00 GPa   
5
Young's Modulus
36.60 GPa   
99+
380.00 GPa   
5
Poisson Ratio
0.28   
17
0.26   
22
Other Mechanical Properties
Ductile   
Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
6.17   
99+
12.41   
20
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
615.00 nΩ·m   
7
43.30 nΩ·m   
99+
Electrical Conductivity
0.01 106/cm Ω   
99+
0.21 106/cm Ω   
8
Electron Affinity
48.00 kJ/mol   
23
109.70 kJ/mol   
7
Thermal Properties
Specific Heat
0.19 J/(kg K)   
32
0.24 J/(kg K)   
22
Molar Heat Capacity
27.11 J/mol·K   
21
24.98 J/mol·K   
99+
Thermal Conductivity
13.40 W/m·K   
99+
150.00 W/m·K   
9
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
12.10 µm/(m·K)   
32
8.20 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
399.60 kJ/mol   
17
495.40 kJ/mol   
12
Enthalpy of Fusion
6.20 kJ/mol   
99+
21.76 kJ/mol   
10
Enthalpy of Atomization
431.00 kJ/mol   
16
556.50 kJ/mol   
12
Standard Molar Entropy
56.90 J/mol.K   
23
31.50 J/mol.K   
99+
Summary >>
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