Home
 Compare Metals

Rhodium vs Molybdenum

Rhodium
Molybdenum
Molybdenum vs Rhodium


Periodic Table
Symbol
Rh  
Mo  
Group Number
9  
9
6  
12
Period Number
5  
5  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440166  
99+
7439987  
99+
Space Group Name
Fm_ 3m  
Im_ 3m  
Space Group Number
225.00  
3
229.00  
2
Facts
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.
  
  • Molybdenum is highly reactive metal, hence not found free in nature .
  • Till 18th century Molybdenum element were often mistaken as a carbon or Lead.
  
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
William Hyde Wollaston  
Carl Wilhelm Scheele  
Discovery
In 1804  
In 1778  
Abundance
  
  
Abundance In Universe
0.00 %  
27
0.00 %  
20
Abundance In Sun
0.00 %  
25
0.00 %  
19
Abundance In Meteorites
0.00 %  
36
0.00 %  
24
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
39
Abundance In Oceans
-  
0.00 %  
9
Abundance In Humans
0.00 %  
24
0.00 %  
17
Uses
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.
  
  • Its alloys are used to make engine parts, drills, saw blade, etc.
  • Lubricant additive made up of Molybdenum disulfide is commonly used in the industry. It is also used as a catalyst.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Aerospace Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
-  
Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
37
0.00 Blood/mg dm-3  
31
In Bone
0.00 p.p.m.  
99+
0.70 p.p.m.  
20
Physical
Melting Point
1,966.00 °C  
12
2,617.00 °C  
5
Boiling Point
3,727.00 °C  
17
4,612.00 °C  
9
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
5.50  
7
Brinell Hardness
980.00 MPa  
10
1,370.00 MPa  
7
Vickers Hardness
1,100.00 MPa  
15
1,400.00 MPa  
11
Speed of Sound
4,700.00 m/s  
19
5,400.00 m/s  
9
Optical Properties
  
  
Refractive Index
2.40  
7
2.00  
15
Reflectivity
84.00 %  
5
58.00 %  
25
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rh  
Mo  
Isotopes
  
  
Known Isotopes
16  
23
25  
14
Electronegativity
  
  
Pauling Electronegativity
2.28  
4
2.16  
6
Sanderson Electronegativity
2.28  
5
1.15  
34
Allred Rochow Electronegativity
1.45  
17
1.30  
25
Mulliken-Jaffe Electronegativity
2.28  
4
2.16  
7
Allen Electronegativity
1.56  
27
2.16  
3
Electropositivity
  
  
Pauling Electropositivity
1.72  
99+
1.84  
99+
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol  
29
684.30 kJ/mol  
37
2nd Energy Level
1,740.00 kJ/mol  
27
1,560.00 kJ/mol  
38
3rd Energy Level
2,997.00 kJ/mol  
27
2,618.00 kJ/mol  
99+
4th Energy Level
7,197.00 kJ/mol  
11
4,480.00 kJ/mol  
36
5th Energy Level
7,197.00 kJ/mol  
26
5,257.00 kJ/mol  
99+
6th Energy Level
7,197.00 kJ/mol  
40
6,640.80 kJ/mol  
99+
7th Energy level
7,197.00 kJ/mol  
35
12,125.00 kJ/mol  
13
8th Energy Level
3,480.00 kJ/mol  
99+
13,860.00 kJ/mol  
16
9th Energy Level
5,090.00 kJ/mol  
99+
15,835.00 kJ/mol  
16
10th Energy Level
7,197.00 kJ/mol  
33
17,980.00 kJ/mol  
18
11th Energy Level
7,197.00 kJ/mol  
32
20,190.00 kJ/mol  
17
12th Energy Level
7,190.00 kJ/mol  
99+
22,219.00 kJ/mol  
38
13th Energy Level
7,190.00 kJ/mol  
27
26,930.00 kJ/mol  
13
14th Energy Level
7,197.00 kJ/mol  
21
29,196.00 kJ/mol  
13
15th Energy Level
71,900.00 kJ/mol  
23
52,490.00 kJ/mol  
99+
16th Energy Level
71,900.00 kJ/mol  
18
55,000.00 kJ/mol  
99+
17th Energy Level
719.70 kJ/mol  
39
61,400.00 kJ/mol  
9
18th Energy Level
7,197.00 kJ/mol  
29
67,700.00 kJ/mol  
9
19th Energy Level
719.70 kJ/mol  
36
74,000.00 kJ/mol  
9
20th Energy Level
719.00 kJ/mol  
30
80,400.00 kJ/mol  
10
21st Energy Level
719.70 kJ/mol  
99+
87,000.00 kJ/mol  
9
22nd Energy Level
719.00 kJ/mol  
24
93,400.00 kJ/mol  
7
23rd Energy Level
719.70 kJ/mol  
99+
98,420.00 kJ/mol  
6
24th Energy Level
719.70 kJ/mol  
23
104,400.00 kJ/mol  
2
25th Energy Level
719.00 kJ/mol  
23
121,900.00 kJ/mol  
1
26th Energy Level
719.70 kJ/mol  
23
127,700.00 kJ/mol  
1
27th Energy Level
719.70 kJ/mol  
22
133,800.00 kJ/mol  
1
28th Energy Level
719.70 kJ/mol  
28
139,800.00 kJ/mol  
1
29th Energy Level
719.70 kJ/mol  
29
148,100.00 kJ/mol  
1
30th Energy Level
719.00 kJ/mol  
23
154,500.00 kJ/mol  
1
Electrochemical Equivalent
1.28 g/amp-hr  
99+
0.89 g/amp-hr  
99+
Electron Work Function
4.98 eV  
10
4.60 eV  
17
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes  
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
45  
99+
42  
99+
Electron Configuration
[Kr] 4d8 5s1  
[Kr] 4d5 5s1  
Crystal Structure
Face Centered Cubic (FCC)  
Body Centered Cubic (BCC)  
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
45  
99+
42  
99+
Number of Neutrons
58  
99+
54  
99+
Number of Electrons
45  
99+
42  
99+
Radius of an Atom
  
  
Atomic Radius
134.00 pm  
99+
139.00 pm  
99+
Covalent Radius
142.00 pm  
99+
154.00 pm  
34
Van der Waals Radius
200.00 pm  
35
200.00 pm  
35
Atomic Weight
102.91 amu  
99+
95.95 amu  
99+
Atomic Volume
8.30 cm3/mol  
99+
9.40 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Ruthenium
  
Niobium
  
Next Element
Palladium
  
Technetium
  
Valence Electron Potential
64.00 (-eV)  
22
88.60 (-eV)  
13
Lattice Constant
380.34 pm  
30
314.70 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.73  
7
1.03  
99+
Mechanical
Density
  
  
Density At Room Temperature
12.41 g/cm3  
30
10.28 g/cm3  
39
Density When Liquid (at m.p.)
10.70 g/cm3  
35
9.33 g/cm3  
99+
Tensile Strength
951.00 MPa  
5
324.00 MPa  
15
Viscosity
0.00  
25
0.00  
5
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.02 (Pa)  
19
0.00 (Pa)  
27
Elasticity properties
  
  
Shear Modulus
150.00 GPa  
6
126.00 GPa  
8
Bulk Modulus
275.00 GPa  
5
230.00 GPa  
6
Young's Modulus
380.00 GPa  
5
329.00 GPa  
6
Poisson Ratio
0.26  
22
0.31  
13
Other Mechanical Properties
Malleable  
Ductile, Weldable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
12.41  
32
10.22  
40
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
9
Susceptibility
0.00  
24
0.00  
29
Electrical Properties
  
  
Electrical Property
Conductor  
Semiconductor  
Resistivity
43.30 nΩ·m  
99+
53.40 nΩ·m  
99+
Electrical Conductivity
0.21 106/cm Ω  
8
0.19 106/cm Ω  
11
Electron Affinity
109.70 kJ/mol  
8
71.90 kJ/mol  
16
Thermal
Specific Heat
0.24 J/(kg K)  
22
0.25 J/(kg K)  
21
Molar Heat Capacity
24.98 J/mol·K  
99+
24.06 J/mol·K  
99+
Thermal Conductivity
150.00 W/m·K  
9
138.00 W/m·K  
12
Critical Temperature
2,237.00 K  
13
2,896.00 K  
6
Thermal Expansion
8.20 µm/(m·K)  
99+
4.80 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol  
16
594.10 kJ/mol  
9
Enthalpy of Fusion
21.76 kJ/mol  
10
27.61 kJ/mol  
5
Enthalpy of Atomization
556.50 kJ/mol  
16
653.00 kJ/mol  
7
Standard Molar Entropy
31.50 J/mol.K  
99+
28.70 J/mol.K  
99+
Periodic Table >>
<< All

Compare Transition Metals

Transition Metals

Transition Metals

» More Transition Metals

Compare Transition Metals

» More Compare Transition Metals
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!