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Lanthanum vs Rhodium

Lanthanum
Rhodium
Rhodium vs Lanthanum


Periodic Table
Symbol
La  
Rh  
Group Number
3  
15
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  
7
225.00  
3
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
0.00 %  
23
0.00 %  
27
Abundance In Sun
0.00 %  
25
0.00 %  
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
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
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
-  
-  
Other Uses
Alloys, Mirror Manufacturing  
Alloys  
Biological Properties
  
  
Toxicity
Low Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
32
0.00 Blood/mg dm-3  
37
In Bone
0.08 p.p.m.  
29
0.00 p.p.m.  
99+
Physical
Melting Point
920.00 °C  
99+
1,966.00 °C  
12
Boiling Point
3,469.00 °C  
19
3,727.00 °C  
17
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
2.50  
15
6.00  
6
Brinell Hardness
350.00 MPa  
36
980.00 MPa  
10
Vickers Hardness
360.00 MPa  
99+
1,100.00 MPa  
15
Speed of Sound
2,475.00 m/s  
99+
4,700.00 m/s  
19
Optical Properties
  
  
Refractive Index
1.80  
22
2.40  
7
Reflectivity
70.00 %  
13
84.00 %  
5
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
La  
Rh  
Isotopes
  
  
Known Isotopes
31  
8
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
2.28  
4
Sanderson Electronegativity
1.10  
38
2.28  
5
Allred Rochow Electronegativity
1.08  
32
1.45  
17
Mulliken-Jaffe Electronegativity
1.10  
99+
2.28  
4
Allen Electronegativity
1.10  
99+
1.56  
27
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  
27
3rd Energy Level
1,850.30 kJ/mol  
99+
2,997.00 kJ/mol  
27
4th Energy Level
4,819.00 kJ/mol  
32
7,197.00 kJ/mol  
11
5th Energy Level
5,940.00 kJ/mol  
99+
7,197.00 kJ/mol  
26
6th Energy Level
5,380.00 kJ/mol  
99+
7,197.00 kJ/mol  
40
7th Energy level
5,380.00 kJ/mol  
99+
7,197.00 kJ/mol  
35
8th Energy Level
5,380.00 kJ/mol  
99+
3,480.00 kJ/mol  
99+
9th Energy Level
5,380.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
10th Energy Level
5,380.00 kJ/mol  
99+
7,197.00 kJ/mol  
33
11th Energy Level
5,380.00 kJ/mol  
99+
7,197.00 kJ/mol  
32
12th Energy Level
5,380.00 kJ/mol  
99+
7,190.00 kJ/mol  
99+
13th Energy Level
5,380.00 kJ/mol  
99+
7,190.00 kJ/mol  
27
14th Energy Level
5,380.00 kJ/mol  
99+
7,197.00 kJ/mol  
21
15th Energy Level
53,800.00 kJ/mol  
99+
71,900.00 kJ/mol  
23
16th Energy Level
53,800.00 kJ/mol  
99+
71,900.00 kJ/mol  
18
17th Energy Level
538.10 kJ/mol  
99+
719.70 kJ/mol  
39
18th Energy Level
5,380.00 kJ/mol  
99+
7,197.00 kJ/mol  
29
19th Energy Level
538.10 kJ/mol  
99+
719.70 kJ/mol  
36
20th Energy Level
538.00 kJ/mol  
99+
719.00 kJ/mol  
30
21st Energy Level
538.10 kJ/mol  
99+
719.70 kJ/mol  
99+
22nd Energy Level
538.00 kJ/mol  
99+
719.00 kJ/mol  
24
23rd Energy Level
5,380.00 kJ/mol  
25
719.70 kJ/mol  
99+
24th Energy Level
538.00 kJ/mol  
99+
719.70 kJ/mol  
23
25th Energy Level
538.00 kJ/mol  
99+
719.00 kJ/mol  
23
26th Energy Level
538.00 kJ/mol  
99+
719.70 kJ/mol  
23
27th Energy Level
538.10 kJ/mol  
99+
719.70 kJ/mol  
22
28th Energy Level
538.00 kJ/mol  
99+
719.70 kJ/mol  
28
29th Energy Level
538.10 kJ/mol  
99+
719.70 kJ/mol  
29
30th Energy Level
538.00 kJ/mol  
99+
719.00 kJ/mol  
23
Electrochemical Equivalent
1.73 g/amp-hr  
99+
1.28 g/amp-hr  
99+
Electron Work Function
3.50 eV  
99+
4.98 eV  
10
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Anti Corrosion, Ionization, Radioactive Isotopes  
Atomic
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  
10
134.00 pm  
99+
Covalent Radius
207.00 pm  
6
142.00 pm  
99+
Van der Waals Radius
240.00 pm  
17
200.00 pm  
35
Atomic Weight
138.91 amu  
99+
102.91 amu  
99+
Atomic Volume
20.73 cm3/mol  
26
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  
31
380.34 pm  
30
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.62  
16
1.73  
7
Mechanical
Density
  
  
Density At Room Temperature
6.16 g/cm3  
99+
12.41 g/cm3  
30
Density When Liquid (at m.p.)
5.94 g/cm3  
99+
10.70 g/cm3  
35
Tensile Strength
45.00 MPa  
40
951.00 MPa  
5
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.98 (Pa)  
15
0.02 (Pa)  
19
Elasticity properties
  
  
Shear Modulus
14.30 GPa  
99+
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
Magnetic Characteristics
  
  
Specific Gravity
6.17  
99+
12.41  
32
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
15
0.00 H/m  
17
Susceptibility
0.00  
25
0.00  
24
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  
28
109.70 kJ/mol  
8
Thermal
Specific Heat
0.19 J/(kg K)  
33
0.24 J/(kg K)  
22
Molar Heat Capacity
27.11 J/mol·K  
27
24.98 J/mol·K  
99+
Thermal Conductivity
13.40 W/m·K  
99+
150.00 W/m·K  
9
Critical Temperature
1,193.00 K  
99+
2,237.00 K  
13
Thermal Expansion
12.10 µm/(m·K)  
99+
8.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
399.60 kJ/mol  
24
495.40 kJ/mol  
16
Enthalpy of Fusion
6.20 kJ/mol  
99+
21.76 kJ/mol  
10
Enthalpy of Atomization
431.00 kJ/mol  
21
556.50 kJ/mol  
16
Standard Molar Entropy
56.90 J/mol.K  
31
31.50 J/mol.K  
99+
Periodic Table >>
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Lanthanide Series

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