Samarium Rhenium Comparison
Periodic Table
Symbol
Sm
Re
Group Number
Not Available
7
11
Period Number
6
6
Block
f block
d block
Element Family
Lanthanide
Transition Metal
CAS Number
7440199
99+
7440155
99+
Space Group Name
R_ 3m
P63/mmc
Space Group Number
166.00
6
194.00
5
Facts
Interesting Facts
- Samarium metals helps stimulating body metabolism.
- Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
- Chemical properties of Rhenium are similar to Manganese.
- Rhenium metal is created while refining Molybdenum.
Sources
Found in Minerals, Mining, Ores of Minerals
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Lecoq de Boisbaudran
Masataka Ogawa
Discovery
In 1879
In 1908
Abundance
Abundance In Universe
5 * 10-7 %
19
2 * 10-8 %
29
Abundance In Sun
~0.0000001 %
26
~0.00000001 %
29
Abundance In Meteorites
0.00 %
37
0.00 %
99+
Abundance In Earth's Crust
0.00 %
29
0.00 %
99+
Abundance In Oceans
0.00 %
40
0.00 %
34
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.
- Alloys of Rhenium are used as an electric contact material. It can resist withstand arc corrosion.
- Its catalysts are used in hydrogenation of fine chemicals. Its Alloy with nickel is used to produce turbine blades.
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
NA
Other Uses
Alloys, In Nuclear Reactors
Alloys
Biological Properties
Toxicity
Slightly Toxic
Low Toxic
Present in Human Body
Yes
No
In Blood
0.01 Blood/mg dm-3
22
Not Available
Physical Properties
Melting Point
1,072.00 °C
99+
3,180.00 °C
2
Boiling Point
1,900.00 °C
99+
5,627.00 °C
2
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery Gray
Luster
Lustrous
Metallic
Hardness
Mohs Hardness
Not Available
7.00
3
Brinell Hardness
441.00 MPa
27
1,320.00 MPa
8
Vickers Hardness
412.00 MPa
24
1,350.00 MPa
7
Speed of Sound
2,130.00 m/s
99+
4,700.00 m/s
15
Optical Properties
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Sm
Re
Isotopes
Known Isotopes
30
9
33
6
Electronegativity
Pauling Electronegativity
1.17
40
1.90
11
Allred Rochow Electronegativity
1.07
32
1.46
15
Allen Electronegativity
Not Available
1.60
21
Electropositivity
Pauling Electropositivity
2.83
14
2.10
99+
Ionization Energies
1st Energy Level
544.50 kJ/mol
99+
760.00 kJ/mol
20
2nd Energy Level
1,070.00 kJ/mol
99+
1,260.00 kJ/mol
99+
3rd Energy Level
2,260.00 kJ/mol
99+
2,510.00 kJ/mol
99+
4th Energy Level
3,990.00 kJ/mol
37
3,640.00 kJ/mol
99+
Electrochemical Equivalent
1.87 g/amp-hr
34
0.99 g/amp-hr
99+
Electron Work Function
2.70 eV
99+
4.96 eV
7
Other Chemical Properties
Ionization, Radioactive Isotopes
Corrosion, Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
62
99+
75
99+
Electron Configuration
[Xe] 4f6 6s2
[Xe] 4f14 5d5 6s2
Crystal Structure
Rhombohedral (RHO)
Hexagonal Close Packed (HCP)
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
62
99+
75
40
Number of Neutrons
88
39
111
26
Number of Electrons
62
99+
75
40
Radius of an Atom
Atomic Radius
180.00 pm
14
137.00 pm
40
Covalent Radius
198.00 pm
13
151.00 pm
34
Van der Waals Radius
229.00 pm
20
200.00 pm
28
Atomic Weight
150.36 amu
99+
186.21 amu
36
Atomic Volume
19.95 cm3/mol
19
8.85 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
44.80 (-eV)
37
180.00 (-eV)
3
Lattice Constant
362.10 pm
33
276.10 pm
99+
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, 2 π/3
Lattice C/A Ratio
Not Available
1.62
3
Mechanical Properties
Density
Density At Room Temperature
7.52 g/cm3
99+
21.02 g/cm3
12
Density When Liquid (at m.p.)
7.16 g/cm3
32
18.90 g/cm3
4
Tensile Strength
Not Available
1,070.00 MPa
3
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.94 (Pa)
9
Not Available
Vapor Pressure at 2000 K
Not Available
0.00 (Pa)
29
Elasticity properties
Shear Modulus
19.50 GPa
34
178.00 GPa
3
Bulk Modulus
37.80 GPa
35
370.00 GPa
2
Young's Modulus
49.70 GPa
37
463.00 GPa
2
Poisson Ratio
0.27
19
0.30
14
Other Mechanical Properties
NA
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
7.52
99+
21.02
5
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
0.94 nΩ·m
99+
193.00 nΩ·m
20
Electrical Conductivity
0.01 106/cm Ω
99+
0.05 106/cm Ω
33
Electron Affinity
50.00 kJ/mol
21
14.50 kJ/mol
35
Thermal Properties
Specific Heat
0.20 J/(kg K)
31
0.13 J/(kg K)
39
Molar Heat Capacity
29.54 J/mol·K
7
25.48 J/mol·K
38
Thermal Conductivity
13.30 W/m·K
99+
48.00 W/m·K
31
Critical Temperature
Not Available
Not Available
Thermal Expansion
12.70 µm/(m·K)
30
6.20 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
166.40 kJ/mol
99+
707.10 kJ/mol
3
Enthalpy of Fusion
8.62 kJ/mol
40
33.05 kJ/mol
2
Enthalpy of Atomization
209.00 kJ/mol
99+
791.00 kJ/mol
2
Standard Molar Entropy
69.60 J/mol.K
15
36.90 J/mol.K
99+
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