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Samarium vs Rhodium

Samarium
Rhodium
Rhodium vs Samarium


Periodic Table
Symbol
Sm  
Rh  
Group Number
3  
15
9  
9
Period Number
6  
5  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440199  
99+
7440166  
99+
Space Group Name
R_ 3m  
Fm_ 3m  
Space Group Number
166.00  
9
225.00  
3
Facts
Interesting Facts
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
  
  • 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
Lecoq de Boisbaudran  
William Hyde Wollaston  
Discovery
In 1879  
In 1804  
Abundance
  
  
Abundance In Universe
0.00 %  
20
0.00 %  
27
Abundance In Sun
0.00 %  
26
0.00 %  
25
Abundance In Meteorites
0.00 %  
37
0.00 %  
36
Abundance In Earth's Crust
0.00 %  
29
0.00 %  
99+
Abundance In Oceans
0.00 %  
40
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Magnets of Samarium cobalt alloy are stronger than that of Iron and hence, they are used in microwave application.
  • Samarium metal also used in optical lasers and infrared absorbing glasses and as a neutron absorber.
  
  • 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, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys, In Nuclear Reactors  
Alloys  
Biological Properties
  
  
Toxicity
Slightly Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.01 Blood/mg dm-3  
22
0.00 Blood/mg dm-3  
37
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,072.00 °C  
99+
1,966.00 °C  
12
Boiling Point
1,900.00 °C  
99+
3,727.00 °C  
17
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Lustrous  
Metallic  
Hardness
  
  
Mohs Hardness
5.50  
7
6.00  
6
Brinell Hardness
441.00 MPa  
32
980.00 MPa  
10
Vickers Hardness
412.00 MPa  
40
1,100.00 MPa  
15
Speed of Sound
2,130.00 m/s  
99+
4,700.00 m/s  
19
Optical Properties
  
  
Refractive Index
1.80  
22
2.40  
7
Reflectivity
65.00 %  
18
84.00 %  
5
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Sm  
Rh  
Isotopes
  
  
Known Isotopes
30  
9
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.17  
99+
2.28  
4
Sanderson Electronegativity
1.17  
33
2.28  
5
Allred Rochow Electronegativity
1.07  
33
1.45  
17
Mulliken-Jaffe Electronegativity
1.17  
40
2.28  
4
Allen Electronegativity
1.17  
99+
1.56  
27
Electropositivity
  
  
Pauling Electropositivity
2.83  
14
1.72  
99+
Ionization Energies
  
  
1st Energy Level
544.50 kJ/mol  
99+
719.70 kJ/mol  
29
2nd Energy Level
1,070.00 kJ/mol  
99+
1,740.00 kJ/mol  
27
3rd Energy Level
2,260.00 kJ/mol  
99+
2,997.00 kJ/mol  
27
4th Energy Level
3,990.00 kJ/mol  
99+
7,197.00 kJ/mol  
11
5th Energy Level
5,445.00 kJ/mol  
99+
7,197.00 kJ/mol  
26
6th Energy Level
5,445.00 kJ/mol  
99+
7,197.00 kJ/mol  
40
7th Energy level
5,445.00 kJ/mol  
99+
7,197.00 kJ/mol  
35
8th Energy Level
5,400.00 kJ/mol  
99+
3,480.00 kJ/mol  
99+
9th Energy Level
5,440.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
10th Energy Level
5,445.00 kJ/mol  
99+
7,197.00 kJ/mol  
33
11th Energy Level
5,445.00 kJ/mol  
99+
7,197.00 kJ/mol  
32
12th Energy Level
5,440.00 kJ/mol  
99+
7,190.00 kJ/mol  
99+
13th Energy Level
5,445.00 kJ/mol  
99+
7,190.00 kJ/mol  
27
14th Energy Level
5,450.00 kJ/mol  
99+
7,197.00 kJ/mol  
21
15th Energy Level
54,450.00 kJ/mol  
99+
71,900.00 kJ/mol  
23
16th Energy Level
54,400.00 kJ/mol  
99+
71,900.00 kJ/mol  
18
17th Energy Level
544.50 kJ/mol  
99+
719.70 kJ/mol  
39
18th Energy Level
5,445.00 kJ/mol  
99+
7,197.00 kJ/mol  
29
19th Energy Level
544.50 kJ/mol  
99+
719.70 kJ/mol  
36
20th Energy Level
624.00 kJ/mol  
99+
719.00 kJ/mol  
30
21st Energy Level
544.50 kJ/mol  
99+
719.70 kJ/mol  
99+
22nd Energy Level
624.00 kJ/mol  
37
719.00 kJ/mol  
24
23rd Energy Level
544.50 kJ/mol  
99+
719.70 kJ/mol  
99+
24th Energy Level
544.50 kJ/mol  
99+
719.70 kJ/mol  
23
25th Energy Level
544.00 kJ/mol  
99+
719.00 kJ/mol  
23
26th Energy Level
544.50 kJ/mol  
99+
719.70 kJ/mol  
23
27th Energy Level
544.50 kJ/mol  
99+
719.70 kJ/mol  
22
28th Energy Level
544.50 kJ/mol  
99+
719.70 kJ/mol  
28
29th Energy Level
544.50 kJ/mol  
99+
719.70 kJ/mol  
29
30th Energy Level
544.00 kJ/mol  
99+
719.00 kJ/mol  
23
Electrochemical Equivalent
1.87 g/amp-hr  
38
1.28 g/amp-hr  
99+
Electron Work Function
2.70 eV  
99+
4.98 eV  
10
Other Chemical Properties
Ionization, Radioactive Isotopes  
Anti Corrosion, Ionization, Radioactive Isotopes  
Atomic
Atomic Number
62  
99+
45  
99+
Electron Configuration
[Xe] 4f6 6s2  
[Kr] 4d8 5s1  
Crystal Structure
Rhombohedral (RHO)  
Face Centered Cubic (FCC)  
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100  
FCC-Crystal-Structure-of-Rhodium.jpg#100  
Atom
  
  
Number of Protons
62  
99+
45  
99+
Number of Neutrons
88  
40
58  
99+
Number of Electrons
62  
99+
45  
99+
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
134.00 pm  
99+
Covalent Radius
198.00 pm  
13
142.00 pm  
99+
Van der Waals Radius
229.00 pm  
25
200.00 pm  
35
Atomic Weight
150.36 amu  
99+
102.91 amu  
99+
Atomic Volume
19.95 cm3/mol  
31
8.30 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Promethium
  
Ruthenium
  
Next Element
Europium
  
Palladium
  
Valence Electron Potential
44.80 (-eV)  
38
64.00 (-eV)  
22
Lattice Constant
362.10 pm  
37
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  
15
1.73  
7
Mechanical
Density
  
  
Density At Room Temperature
7.52 g/cm3  
99+
12.41 g/cm3  
30
Density When Liquid (at m.p.)
7.16 g/cm3  
99+
10.70 g/cm3  
35
Tensile Strength
50.00 MPa  
38
951.00 MPa  
5
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.94 (Pa)  
9
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
29
0.02 (Pa)  
19
Elasticity properties
  
  
Shear Modulus
19.50 GPa  
99+
150.00 GPa  
6
Bulk Modulus
37.80 GPa  
99+
275.00 GPa  
5
Young's Modulus
49.70 GPa  
40
380.00 GPa  
5
Poisson Ratio
0.27  
19
0.26  
22
Other Mechanical Properties
-  
Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.52  
99+
12.41  
32
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
0.94 nΩ·m  
99+
43.30 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.21 106/cm Ω  
8
Electron Affinity
50.00 kJ/mol  
26
109.70 kJ/mol  
8
Thermal
Specific Heat
0.20 J/(kg K)  
32
0.24 J/(kg K)  
22
Molar Heat Capacity
29.54 J/mol·K  
9
24.98 J/mol·K  
99+
Thermal Conductivity
13.30 W/m·K  
99+
150.00 W/m·K  
9
Critical Temperature
1,345.00 K  
99+
2,237.00 K  
13
Thermal Expansion
12.70 µm/(m·K)  
39
8.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
166.40 kJ/mol  
99+
495.40 kJ/mol  
16
Enthalpy of Fusion
8.62 kJ/mol  
99+
21.76 kJ/mol  
10
Enthalpy of Atomization
209.00 kJ/mol  
99+
556.50 kJ/mol  
16
Standard Molar Entropy
69.60 J/mol.K  
15
31.50 J/mol.K  
99+
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