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Neodymium vs Rhodium

Neodymium
Rhodium
Rhodium vs Neodymium


Periodic Table
Symbol
-  
Rh  
Group Number
1  
17
9  
9
Period Number
6  
5  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440008  
99+
7440166  
99+
Space Group Name
P63/mmc  
Fm_ 3m  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • Neodymium is not found free in nature, hence it is not a native metal.
  • Neodymium metal found in minerals like Monazite and Bastnaesite.
  
  • 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  
Earth's crust, Found As a By-product, Found in Minerals, Mining  
History
  
  
Who Discovered
Carl Auer von Welsbach  
William Hyde Wollaston  
Discovery
In 1885  
In 1804  
Abundance
  
  
Abundance In Universe
0.00 %  
17
0.00 %  
27
Abundance In Sun
0.00 %  
24
0.00 %  
25
Abundance In Meteorites
0.00 %  
30
0.00 %  
36
Abundance In Earth's Crust
0.00 %  
20
0.00 %  
99+
Abundance In Oceans
0.00 %  
30
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Neodymium-Iron-boron alloy is used to make permanent magnets.
  • It is used in microphones, Mp3 player, loudspeakers, mobile phones, etc.
  
  • 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, Electrical Industry, Electronic Industry  
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Non Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
34
0.00 Blood/mg dm-3  
37
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,010.00 °C  
99+
1,966.00 °C  
12
Boiling Point
3,127.00 °C  
29
3,727.00 °C  
17
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
7.00  
3
6.00  
6
Brinell Hardness
265.00 MPa  
99+
980.00 MPa  
10
Vickers Hardness
345.00 MPa  
99+
1,100.00 MPa  
15
Speed of Sound
2,330.00 m/s  
99+
4,700.00 m/s  
19
Optical Properties
  
  
Refractive Index
1.64  
30
2.40  
7
Reflectivity
80.00 %  
7
84.00 %  
5
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
-  
Rh  
Isotopes
  
  
Known Isotopes
30  
9
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.14  
99+
2.28  
4
Sanderson Electronegativity
1.14  
35
2.28  
5
Allred Rochow Electronegativity
1.07  
33
1.45  
17
Mulliken-Jaffe Electronegativity
1.14  
99+
2.28  
4
Allen Electronegativity
1.14  
99+
1.56  
27
Electropositivity
  
  
Pauling Electropositivity
2.86  
13
1.72  
99+
Ionization Energies
  
  
1st Energy Level
533.10 kJ/mol  
99+
719.70 kJ/mol  
29
2nd Energy Level
1,040.00 kJ/mol  
99+
1,740.00 kJ/mol  
27
3rd Energy Level
2,130.00 kJ/mol  
99+
2,997.00 kJ/mol  
27
4th Energy Level
3,900.00 kJ/mol  
99+
7,197.00 kJ/mol  
11
5th Energy Level
5,330.00 kJ/mol  
99+
7,197.00 kJ/mol  
26
6th Energy Level
5,330.00 kJ/mol  
99+
7,197.00 kJ/mol  
40
7th Energy level
5,331.00 kJ/mol  
99+
7,197.00 kJ/mol  
35
8th Energy Level
5,360.00 kJ/mol  
99+
3,480.00 kJ/mol  
99+
9th Energy Level
5,330.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
10th Energy Level
5,330.00 kJ/mol  
99+
7,197.00 kJ/mol  
33
11th Energy Level
5,330.00 kJ/mol  
99+
7,197.00 kJ/mol  
32
12th Energy Level
5,330.00 kJ/mol  
99+
7,190.00 kJ/mol  
99+
13th Energy Level
5,330.00 kJ/mol  
99+
7,190.00 kJ/mol  
27
14th Energy Level
533.10 kJ/mol  
99+
7,197.00 kJ/mol  
21
15th Energy Level
53,300.00 kJ/mol  
99+
71,900.00 kJ/mol  
23
16th Energy Level
533.10 kJ/mol  
99+
71,900.00 kJ/mol  
18
17th Energy Level
533.10 kJ/mol  
99+
719.70 kJ/mol  
39
18th Energy Level
5,331.00 kJ/mol  
99+
7,197.00 kJ/mol  
29
19th Energy Level
533.10 kJ/mol  
99+
719.70 kJ/mol  
36
20th Energy Level
536.00 kJ/mol  
99+
719.00 kJ/mol  
30
21st Energy Level
533.10 kJ/mol  
99+
719.70 kJ/mol  
99+
22nd Energy Level
533.00 kJ/mol  
99+
719.00 kJ/mol  
24
23rd Energy Level
5,331.00 kJ/mol  
27
719.70 kJ/mol  
99+
24th Energy Level
533.10 kJ/mol  
99+
719.70 kJ/mol  
23
25th Energy Level
533.10 kJ/mol  
99+
719.00 kJ/mol  
23
26th Energy Level
533.10 kJ/mol  
99+
719.70 kJ/mol  
23
27th Energy Level
533.10 kJ/mol  
99+
719.70 kJ/mol  
22
28th Energy Level
533.10 kJ/mol  
99+
719.70 kJ/mol  
28
29th Energy Level
533.10 kJ/mol  
99+
719.70 kJ/mol  
29
30th Energy Level
533.10 kJ/mol  
99+
719.00 kJ/mol  
23
Electrochemical Equivalent
1.79 g/amp-hr  
99+
1.28 g/amp-hr  
99+
Electron Work Function
3.20 eV  
99+
4.98 eV  
10
Other Chemical Properties
Chemical Stability, Corrosion, Flammable, Ionization  
Anti Corrosion, Ionization, Radioactive Isotopes  
Atomic
Atomic Number
60  
99+
45  
99+
Electron Configuration
[Xe] 4f4 6s2  
[Kr] 4d8 5s1  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
DHCP-Crystal-Structure-of-Neodymium.jpg#100  
FCC-Crystal-Structure-of-Rhodium.jpg#100  
Atom
  
  
Number of Protons
60  
99+
45  
99+
Number of Neutrons
84  
99+
58  
99+
Number of Electrons
60  
99+
45  
99+
Radius of an Atom
  
  
Atomic Radius
181.00 pm  
15
134.00 pm  
99+
Covalent Radius
201.00 pm  
10
142.00 pm  
99+
Van der Waals Radius
229.00 pm  
25
200.00 pm  
35
Atomic Weight
144.24 amu  
99+
102.91 amu  
99+
Atomic Volume
20.60 cm3/mol  
28
8.30 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Praseodymium
  
Ruthenium
  
Next Element
Promethium
  
Palladium
  
Valence Electron Potential
43.40 (-eV)  
99+
64.00 (-eV)  
22
Lattice Constant
365.80 pm  
33
380.34 pm  
30
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.61  
18
1.73  
7
Mechanical
Density
  
  
Density At Room Temperature
7.01 g/cm3  
99+
12.41 g/cm3  
30
Density When Liquid (at m.p.)
6.89 g/cm3  
99+
10.70 g/cm3  
35
Tensile Strength
345.00 MPa  
13
951.00 MPa  
5
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
23
0.00 (Pa)  
37
Vapor Pressure at 2000 K
101.00 (Pa)  
2
0.02 (Pa)  
19
Elasticity properties
  
  
Shear Modulus
16.30 GPa  
99+
150.00 GPa  
6
Bulk Modulus
31.80 GPa  
99+
275.00 GPa  
5
Young's Modulus
41.40 GPa  
99+
380.00 GPa  
5
Poisson Ratio
0.28  
16
0.26  
22
Other Mechanical Properties
-  
Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.00  
99+
12.41  
32
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
7
0.00 H/m  
17
Susceptibility
0.00  
9
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
643.00 nΩ·m  
6
43.30 nΩ·m  
99+
Electrical Conductivity
0.02 106/cm Ω  
99+
0.21 106/cm Ω  
8
Electron Affinity
50.00 kJ/mol  
26
109.70 kJ/mol  
8
Thermal
Specific Heat
0.19 J/(kg K)  
33
0.24 J/(kg K)  
22
Molar Heat Capacity
27.45 J/mol·K  
22
24.98 J/mol·K  
99+
Thermal Conductivity
16.50 W/m·K  
99+
150.00 W/m·K  
9
Critical Temperature
1,297.00 K  
99+
2,237.00 K  
13
Thermal Expansion
9.60 µm/(m·K)  
99+
8.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
273.00 kJ/mol  
99+
495.40 kJ/mol  
16
Enthalpy of Fusion
7.14 kJ/mol  
99+
21.76 kJ/mol  
10
Enthalpy of Atomization
322.00 kJ/mol  
99+
556.50 kJ/mol  
16
Standard Molar Entropy
71.50 J/mol.K  
13
31.50 J/mol.K  
99+
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