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Sm Element
Samarium


Periodic Table
Symbol
Sm
Group Number
3 15
Period Number
6 2
Block
f block
Element Family
Lanthanide
CAS Number
7440199 60
Space Group Name
R_ 3m
Space Group Number
166.00 9
Facts
Interesting Facts
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
Sources
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Lecoq de Boisbaudran
Discovery
In 1879
Abundance
Abundance In Universe
0.00 % 20
Abundance In Sun
0.00 % 26
Abundance In Meteorites
0.00 % 37
Abundance In Earth's Crust
0.00 % 29
Abundance In Oceans
0.00 % 40
Abundance In Humans
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.
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry
Medical Uses
-
Other Uses
Alloys, In Nuclear Reactors
Biological Properties
Toxicity
Slightly Toxic
Present in Human Body
Yes
In Blood
0.01 Blood/mg dm-3 22
In Bone
0.00 p.p.m. 41
Physical
Melting Point
1,072.00 °C 41
Boiling Point
1,900.00 °C 54
Appearance
Physical State
Solid
Color
Silvery White
Luster
Lustrous
Hardness
Mohs Hardness
5.50 7
Brinell Hardness
441.00 MPa 32
Vickers Hardness
412.00 MPa 40
Speed of Sound
2,130.00 m/s 59
Optical Properties
Refractive Index
1.80 22
Reflectivity
65.00 % 18
Allotropes
No
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical
Chemical Formula
Sm
Isotopes
Known Isotopes
30 9
Electronegativity
Pauling Electronegativity
1.17 41
Sanderson Electronegativity
1.17 33
Allred Rochow Electronegativity
1.07 33
Mulliken-Jaffe Electronegativity
1.17 40
Allen Electronegativity
1.17 50
Electropositivity
Pauling Electropositivity
2.83 14
Ionization Energies
1st Energy Level
544.50 kJ/mol 72
2nd Energy Level
1,070.00 kJ/mol 76
3rd Energy Level
2,260.00 kJ/mol 61
4th Energy Level
3,990.00 kJ/mol 47
5th Energy Level
5,445.00 kJ/mol 65
6th Energy Level
5,445.00 kJ/mol 78
7th Energy level
5,445.00 kJ/mol 68
8th Energy Level
5,400.00 kJ/mol 68
9th Energy Level
5,440.00 kJ/mol 66
10th Energy Level
5,445.00 kJ/mol 65
11th Energy Level
5,445.00 kJ/mol 70
12th Energy Level
5,440.00 kJ/mol 73
13th Energy Level
5,445.00 kJ/mol 62
14th Energy Level
5,450.00 kJ/mol 49
15th Energy Level
54,450.00 kJ/mol 62
16th Energy Level
54,400.00 kJ/mol 50
17th Energy Level
544.50 kJ/mol 76
18th Energy Level
5,445.00 kJ/mol 64
19th Energy Level
544.50 kJ/mol 74
20th Energy Level
624.00 kJ/mol 43
21st Energy Level
544.50 kJ/mol 78
22nd Energy Level
624.00 kJ/mol 37
23rd Energy Level
544.50 kJ/mol 77
24th Energy Level
544.50 kJ/mol 69
25th Energy Level
544.00 kJ/mol 65
26th Energy Level
544.50 kJ/mol 73
27th Energy Level
544.50 kJ/mol 69
28th Energy Level
544.50 kJ/mol 72
29th Energy Level
544.50 kJ/mol 75
30th Energy Level
544.00 kJ/mol 69
Electrochemical Equivalent
1.87 g/amp-hr 38
Electron Work Function
2.70 eV 52
Other Chemical Properties
Ionization, Radioactive Isotopes
Atomic
Atomic Number
62 54
Electron Configuration
[Xe] 4f6 6s2
Crystal Structure
Rhombohedral (RHO)
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100
Atom
Number of Protons
62 53
Number of Neutrons
88 40
Number of Electrons
62 53
Radius of an Atom
Atomic Radius
180.00 pm 16
Covalent Radius
198.00 pm 13
Van der Waals Radius
229.00 pm 25
Atomic Weight
150.36 amu 48
Atomic Volume
19.95 cm3/mol 31
Adjacent Atomic Numbers
Previous Element
74
Next Element
73
Valence Electron Potential
44.80 (-eV) 38
Lattice Constant
362.10 pm 37
Lattice Angles
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.62 15
Mechanical
Density
Density At Room Temperature
7.52 g/cm3 58
Density When Liquid (at m.p.)
7.16 g/cm3 61
Tensile Strength
50.00 MPa 38
Viscosity
0.00 25
Vapor Pressure
Vapor Pressure at 1000 K
0.94 (Pa) 9
Vapor Pressure at 2000 K
0.00 (Pa) 29
Elasticity properties
Shear Modulus
19.50 GPa 44
Bulk Modulus
37.80 GPa 43
Young's Modulus
49.70 GPa 40
Poisson Ratio
0.27 19
Other Mechanical Properties
-
Magnetic
Magnetic Characteristics
Specific Gravity
7.52 57
Magnetic Ordering
Paramagnetic
Permeability
0.00 H/m 9
Susceptibility
0.00 24
Electrical Properties
Electrical Property
Conductor
Resistivity
0.94 nΩ·m 73
Electrical Conductivity
0.01 106/cm Ω 63
Electron Affinity
50.00 kJ/mol 26
Thermal
Specific Heat
0.20 J/(kg K) 32
Molar Heat Capacity
29.54 J/mol·K 9
Thermal Conductivity
13.30 W/m·K 59
Critical Temperature
1,345.00 K 44
Thermal Expansion
12.70 µm/(m·K) 39
Enthalpy
Enthalpy of Vaporization
166.40 kJ/mol 65
Enthalpy of Fusion
8.62 kJ/mol 46
Enthalpy of Atomization
209.00 kJ/mol 55
Standard Molar Entropy
69.60 J/mol.K 15
Summary >>
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