Samarium Uranium Comparison
Periodic Table
Symbol
Sm
U
Group Number
Not Available
0
18
Period Number
6
7
Block
f block
f block
Element Family
Lanthanide
Actinide
CAS Number
7440199
99+
7440611
28
Space Group Name
R_ 3m
Cmcm
Space Group Number
166.00
6
63.00
10
Facts
Interesting Facts
- Samarium metals helps stimulating body metabolism.
- Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
- Major mining countries of Uranium include Russia, Australia, Namibia, Canada and Niger and total 33% Uranium are mine in Kazakhstan.
Sources
Found in Minerals, Mining, Ores of Minerals
Earth's crust, Mining, Ores of Minerals
History
Who Discovered
Lecoq de Boisbaudran
Not Available
Discovery
In 1879
In 1789
Abundance
Abundance In Universe
5 * 10-7 %
19
2 * 10-8 %
29
Abundance In Sun
~0.0000001 %
26
~0.0000001 %
26
Abundance In Meteorites
0.00 %
37
0.00 %
99+
Abundance In Earth's Crust
0.00 %
29
0.00 %
36
Abundance In Oceans
0.00 %
40
0.00 %
11
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.
- The main use of this metal include nuclear fuel which is used to generate electricity yin nuclear power stations.
- Synthetic elements like transuranium are made from Uranium metal.
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry
Ammunition Industry, Chemical Industry
Medical Uses
NA
NA
Other Uses
Alloys, In Nuclear Reactors
Alloys, Jewellery, Nuclear Reactor's Fuel, Sculptures, Statues
Biological Properties
Toxicity
Slightly Toxic
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+
1,132.00 °C
39
Boiling Point
1,900.00 °C
99+
3,818.00 °C
16
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery Gray
Luster
Lustrous
Metallic
Hardness
Mohs Hardness
Not Available
6.00
6
Brinell Hardness
441.00 MPa
27
2,350.00 MPa
2
Vickers Hardness
412.00 MPa
24
1,960.00 MPa
2
Speed of Sound
2,130.00 m/s
99+
3,155.00 m/s
25
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
U
Isotopes
Known Isotopes
30
9
25
14
Electronegativity
Pauling Electronegativity
1.17
40
1.38
28
Allred Rochow Electronegativity
1.07
32
1.22
26
Electropositivity
Pauling Electropositivity
2.83
14
2.62
26
Ionization Energies
1st Energy Level
544.50 kJ/mol
99+
597.60 kJ/mol
99+
2nd Energy Level
1,070.00 kJ/mol
99+
1,420.00 kJ/mol
99+
3rd Energy Level
2,260.00 kJ/mol
99+
1,900.00 kJ/mol
99+
4th Energy Level
3,990.00 kJ/mol
37
3,145.00 kJ/mol
99+
Electrochemical Equivalent
1.87 g/amp-hr
34
1.48 g/amp-hr
99+
Electron Work Function
2.70 eV
99+
3.63 eV
30
Other Chemical Properties
Ionization, Radioactive Isotopes
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
62
99+
92
26
Electron Configuration
[Xe] 4f6 6s2
[Rn] 5f3 6d1 7s2
Crystal Structure
Rhombohedral (RHO)
Orthorhombic (ORTH)
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100
ORTH-Crystal-Structure-of-Uranium.jpg#100
Atom
Number of Protons
62
99+
92
26
Number of Neutrons
88
39
146
13
Number of Electrons
62
99+
92
26
Radius of an Atom
Atomic Radius
180.00 pm
14
156.00 pm
29
Covalent Radius
198.00 pm
13
196.00 pm
14
Van der Waals Radius
229.00 pm
20
186.00 pm
33
Atomic Weight
150.36 amu
99+
238.03 amu
21
Atomic Volume
19.95 cm3/mol
19
12.59 cm3/mol
40
Adjacent Atomic Numbers
Valence Electron Potential
44.80 (-eV)
37
170.00 (-eV)
4
Lattice Constant
362.10 pm
33
295.08 pm
99+
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
7.52 g/cm3
99+
19.10 g/cm3
17
Density When Liquid (at m.p.)
7.16 g/cm3
32
17.30 g/cm3
7
Tensile Strength
Not Available
Not Available
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
0.01 (Pa)
20
Elasticity properties
Shear Modulus
19.50 GPa
34
111.00 GPa
10
Bulk Modulus
37.80 GPa
35
100.00 GPa
16
Young's Modulus
49.70 GPa
37
208.00 GPa
10
Poisson Ratio
0.27
19
0.23
30
Other Mechanical Properties
NA
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
7.52
99+
18.80
10
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Poor Conductor
Resistivity
0.94 nΩ·m
99+
0.28 nΩ·m
99+
Electrical Conductivity
0.01 106/cm Ω
99+
0.04 106/cm Ω
37
Electron Affinity
50.00 kJ/mol
21
Not Available
Thermal Properties
Specific Heat
0.20 J/(kg K)
31
0.12 J/(kg K)
40
Molar Heat Capacity
29.54 J/mol·K
7
27.67 J/mol·K
15
Thermal Conductivity
13.30 W/m·K
99+
27.50 W/m·K
40
Critical Temperature
Not Available
Not Available
Thermal Expansion
12.70 µm/(m·K)
30
13.90 µm/(m·K)
27
Enthalpy
Enthalpy of Vaporization
166.40 kJ/mol
99+
477.00 kJ/mol
13
Enthalpy of Fusion
8.62 kJ/mol
40
15.48 kJ/mol
19
Enthalpy of Atomization
209.00 kJ/mol
99+
489.50 kJ/mol
14
Standard Molar Entropy
69.60 J/mol.K
15
50.20 J/mol.K
31
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