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Rhodium vs Holmium

Rhodium
Holmium
Holmium vs Rhodium


Periodic Table
Symbol
Rh  
Ho  
Group Number
9  
9
3  
15
Period Number
5  
6  
Block
d block  
f block  
Element Family
Transition Metal  
Lanthanide  
CAS Number
7440166  
99+
7440600  
29
Space Group Name
Fm_ 3m  
P63/mmc  
Space Group Number
225.00  
3
194.00  
7
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.
  
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
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  
Marc Delafontaine  
Discovery
In 1804  
In 1878  
Abundance
  
  
Abundance In Universe
0.00 %  
27
0.00 %  
28
Abundance In Sun
0.00 %  
25
-  
Abundance In Meteorites
0.00 %  
36
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
38
Abundance In Oceans
-  
0.00 %  
99+
Abundance In Humans
0.00 %  
24
0.00 %  
24
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.
  
  • Holmium metal has an ability to absorb neutrons, so this metal is used in nuclear reactors to keep the chain reactions of elements under control.
  • Alloys of Holmium are used to produce Magnet.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys, Nuclear Research  
Biological Properties
  
  
Toxicity
-  
Low Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
37
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,966.00 °C  
12
1,461.00 °C  
30
Boiling Point
3,727.00 °C  
17
2,600.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
4.00  
11
Brinell Hardness
980.00 MPa  
10
746.00 MPa  
14
Vickers Hardness
1,100.00 MPa  
15
481.00 MPa  
36
Speed of Sound
4,700.00 m/s  
19
2,760.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.40  
7
1.67  
29
Reflectivity
84.00 %  
5
67.00 %  
16
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rh  
Ho  
Isotopes
  
  
Known Isotopes
16  
23
34  
5
Electronegativity
  
  
Pauling Electronegativity
2.28  
4
1.23  
38
Sanderson Electronegativity
2.28  
5
1.23  
30
Allred Rochow Electronegativity
1.45  
17
1.10  
31
Mulliken-Jaffe Electronegativity
2.28  
4
1.23  
37
Allen Electronegativity
1.56  
27
1.23  
99+
Electropositivity
  
  
Pauling Electropositivity
1.72  
99+
2.77  
17
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol  
29
581.00 kJ/mol  
99+
2nd Energy Level
1,740.00 kJ/mol  
27
1,140.00 kJ/mol  
99+
3rd Energy Level
2,997.00 kJ/mol  
27
2,204.00 kJ/mol  
99+
4th Energy Level
7,197.00 kJ/mol  
11
4,100.00 kJ/mol  
99+
5th Energy Level
7,197.00 kJ/mol  
26
5,810.00 kJ/mol  
99+
6th Energy Level
7,197.00 kJ/mol  
40
5,810.00 kJ/mol  
99+
7th Energy level
7,197.00 kJ/mol  
35
5,810.00 kJ/mol  
99+
8th Energy Level
3,480.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
9th Energy Level
5,090.00 kJ/mol  
99+
6,500.00 kJ/mol  
39
10th Energy Level
7,197.00 kJ/mol  
33
6,500.00 kJ/mol  
99+
11th Energy Level
7,197.00 kJ/mol  
32
5,810.00 kJ/mol  
99+
12th Energy Level
7,190.00 kJ/mol  
99+
5,810.00 kJ/mol  
99+
13th Energy Level
7,190.00 kJ/mol  
27
5,810.00 kJ/mol  
99+
14th Energy Level
7,197.00 kJ/mol  
21
5,810.00 kJ/mol  
40
15th Energy Level
71,900.00 kJ/mol  
23
58,100.00 kJ/mol  
99+
16th Energy Level
71,900.00 kJ/mol  
18
581.00 kJ/mol  
99+
17th Energy Level
719.70 kJ/mol  
39
581.00 kJ/mol  
99+
18th Energy Level
7,197.00 kJ/mol  
29
5,810.00 kJ/mol  
99+
19th Energy Level
719.70 kJ/mol  
36
581.00 kJ/mol  
99+
20th Energy Level
719.00 kJ/mol  
30
581.00 kJ/mol  
99+
21st Energy Level
719.70 kJ/mol  
99+
581.00 kJ/mol  
99+
22nd Energy Level
719.00 kJ/mol  
24
581.00 kJ/mol  
99+
23rd Energy Level
719.70 kJ/mol  
99+
5,810.00 kJ/mol  
20
24th Energy Level
719.70 kJ/mol  
23
581.00 kJ/mol  
99+
25th Energy Level
719.00 kJ/mol  
23
581.00 kJ/mol  
99+
26th Energy Level
719.70 kJ/mol  
23
581.00 kJ/mol  
99+
27th Energy Level
719.70 kJ/mol  
22
584.70 kJ/mol  
99+
28th Energy Level
719.70 kJ/mol  
28
581.00 kJ/mol  
99+
29th Energy Level
719.70 kJ/mol  
29
584.70 kJ/mol  
99+
30th Energy Level
719.00 kJ/mol  
23
581.00 kJ/mol  
99+
Electrochemical Equivalent
1.28 g/amp-hr  
99+
2.02 g/amp-hr  
33
Electron Work Function
4.98 eV  
10
4.90 eV  
12
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes  
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
45  
99+
67  
99+
Electron Configuration
[Kr] 4d8 5s1  
[Xe] 4f11 6s2  
Crystal Structure
Face Centered Cubic (FCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100  
HCP-Crystal-Structure-of-Holmium.jpg#100  
Atom
  
  
Number of Protons
45  
99+
67  
99+
Number of Neutrons
58  
99+
98  
35
Number of Electrons
45  
99+
67  
99+
Radius of an Atom
  
  
Atomic Radius
134.00 pm  
99+
176.00 pm  
20
Covalent Radius
142.00 pm  
99+
192.00 pm  
17
Van der Waals Radius
200.00 pm  
35
216.00 pm  
30
Atomic Weight
102.91 amu  
99+
164.93 amu  
99+
Atomic Volume
8.30 cm3/mol  
99+
18.70 cm3/mol  
36
Adjacent Atomic Numbers
  
  
Previous Element
Ruthenium
  
Dysprosium
  
Next Element
Palladium
  
Erbium
  
Valence Electron Potential
64.00 (-eV)  
22
47.90 (-eV)  
32
Lattice Constant
380.34 pm  
30
357.73 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.73  
7
1.57  
40
Mechanical
Density
  
  
Density At Room Temperature
12.41 g/cm3  
30
8.79 g/cm3  
99+
Density When Liquid (at m.p.)
10.70 g/cm3  
35
8.34 g/cm3  
99+
Tensile Strength
951.00 MPa  
5
270.00 MPa  
17
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
17
Vapor Pressure at 2000 K
0.02 (Pa)  
19
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
150.00 GPa  
6
26.30 GPa  
35
Bulk Modulus
275.00 GPa  
5
40.20 GPa  
37
Young's Modulus
380.00 GPa  
5
64.80 GPa  
33
Poisson Ratio
0.26  
22
0.23  
29
Other Mechanical Properties
Malleable  
Ductile, Malleable, Sectile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
12.41  
32
8.80  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
7
Susceptibility
0.00  
24
0.00  
11
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
43.30 nΩ·m  
99+
814.00 nΩ·m  
4
Electrical Conductivity
0.21 106/cm Ω  
8
0.01 106/cm Ω  
99+
Electron Affinity
109.70 kJ/mol  
8
50.00 kJ/mol  
26
Thermal
Specific Heat
0.24 J/(kg K)  
22
0.16 J/(kg K)  
36
Molar Heat Capacity
24.98 J/mol·K  
99+
27.15 J/mol·K  
25
Thermal Conductivity
150.00 W/m·K  
9
16.20 W/m·K  
99+
Critical Temperature
2,237.00 K  
13
1,747.00 K  
34
Thermal Expansion
8.20 µm/(m·K)  
99+
11.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol  
16
241.00 kJ/mol  
99+
Enthalpy of Fusion
21.76 kJ/mol  
10
11.76 kJ/mol  
35
Enthalpy of Atomization
556.50 kJ/mol  
16
301.00 kJ/mol  
99+
Standard Molar Entropy
31.50 J/mol.K  
99+
75.30 J/mol.K  
8
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