Symbol
Sm
Pb
Group Number
314
0
17
👆🏻
Period Number
66
2
7
👆🏻
Block
f block
p block
Element Family
Lanthanide
Post-Transition
CAS Number
74401997439921
7429905
54386242
👆🏻
Space Group Name
R_ 3m
Fm_ 3m
Space Group Number
166.00225.00
11
276
👆🏻
Interesting Facts
- Samarium metals helps stimulating body metabolism.
- Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
- Galena mineral contains almost 87% of Lead metal in it, Galena is sulfide mineral.
- The best available source of Lead metal today is by recycling automobile batteries.
Sources
Found in Minerals, Mining, Ores of Minerals
Earth's crust, Found in Minerals, Mining, Ores of metals, Ores of Minerals
History
Who Discovered
Lecoq de Boisbaudran
-
Discovery
In 1879
In Middle Easterns (7000 BCE)
Abundance
Abundance In Universe
0.00 %0.00 %
0
0.11
👆🏻
Abundance In Sun
0.00 %0.00 %
0
0.1
👆🏻
Abundance In Meteorites
0.00 %0.00 %
0
22
👆🏻
Abundance In Earth's Crust
0.00 %0.00 %
1E-37
8.1
👆🏻
Abundance In Oceans
0.00 %0.00 %
0
1.1
👆🏻
Abundance In Humans
0.00 %0.00 %
0
1.4
👆🏻
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.
- It is also used in insecticides, hair dyes and as an anti-knocking additive for petrol. But all these are banned by the government as Lead metal is known for detrimental to health.
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry
Chemical Industry, Electrical Industry, Electronic Industry
Medical Uses
-
Surgical Instruments Manufacturing
Other Uses
Alloys, In Nuclear Reactors
Alloys
Biological Properties
Toxicity
Slightly Toxic
Toxic
Present in Human Body
✔
✘
✔
✘
In Blood
0.01 Blood/mg dm-30.21 Blood/mg dm-3
0
1970
👆🏻
In Bone
0.00 p.p.m.30.00 p.p.m.
0
170000
👆🏻
Melting Point
1,072.00 °C327.50 °C
-38.83
3410
👆🏻
Boiling Point
1,900.00 °C1,740.00 °C
0
5660
👆🏻
Appearance
Physical State
Solid
Solid
Color
Silvery White
Gray
Luster
Lustrous
Metallic
Hardness
Mohs Hardness
5.501.50
0.2
8.5
👆🏻
Brinell Hardness
441.00 MPa38.00 MPa
0.14
3490
👆🏻
Vickers Hardness
412.00 MPa38.00 MPa
0
3920
👆🏻
Speed of Sound
2,130.00 m/s1,190.00 m/s
818
16200
👆🏻
Optical Properties
Refractive Index
1.802.02
0.155
3.41
👆🏻
Reflectivity
65.00 %5.00 %
5
97
👆🏻
Allotropes
✔
✘
✔
✘
α Allotropes
-
-
β Allotropes
-
-
γ Allotropes
-
-
Chemical Formula
Sm
Pb
Isotopes
Known Isotopes
3035
0
38
👆🏻
Electronegativity
Pauling Electronegativity
1.171.87
0
2.6
👆🏻
Sanderson Electronegativity
1.172.29
0.22
2.56
👆🏻
Allred Rochow Electronegativity
1.071.55
0.86
1.9
👆🏻
Mulliken-Jaffe Electronegativity
1.172.41
0.62
2.48
👆🏻
Allen Electronegativity
1.171.85
0.659
2.7
👆🏻
Electropositivity
Pauling Electropositivity
2.831.67
1.46
3.3
👆🏻
Ionization Energies
1st Energy Level
544.50 kJ/mol715.60 kJ/mol
375.7
26130
👆🏻
2nd Energy Level
1,070.00 kJ/mol1,450.50 kJ/mol
392.8
28750
👆🏻
3rd Energy Level
2,260.00 kJ/mol3,081.50 kJ/mol
392.8
34230
👆🏻
4th Energy Level
3,990.00 kJ/mol4,083.00 kJ/mol
375.7
37066
👆🏻
5th Energy Level
5,445.00 kJ/mol6,640.00 kJ/mol
392
97510
👆🏻
6th Energy Level
5,445.00 kJ/mol7,150.00 kJ/mol
1007
105800
👆🏻
7th Energy level
5,445.00 kJ/mol7,156.00 kJ/mol
1007
114300
👆🏻
8th Energy Level
5,400.00 kJ/mol7,150.00 kJ/mol
730
125300
👆🏻
9th Energy Level
5,440.00 kJ/mol7,156.00 kJ/mol
1007
134700
👆🏻
10th Energy Level
5,445.00 kJ/mol7,156.00 kJ/mol
392
144300
👆🏻
11th Energy Level
5,445.00 kJ/mol7,156.00 kJ/mol
392
169988
👆🏻
12th Energy Level
5,440.00 kJ/mol7,150.00 kJ/mol
0
189368
👆🏻
13th Energy Level
5,445.00 kJ/mol7,150.00 kJ/mol
1007
76015
👆🏻
14th Energy Level
5,450.00 kJ/mol715.60 kJ/mol
380
86450
👆🏻
15th Energy Level
54,450.00 kJ/mol71,500.00 kJ/mol
33000
100700
👆🏻
16th Energy Level
54,400.00 kJ/mol71,500.00 kJ/mol
375.7
109480
👆🏻
17th Energy Level
544.50 kJ/mol715.60 kJ/mol
375.7
122200
👆🏻
18th Energy Level
5,445.00 kJ/mol7,150.00 kJ/mol
0
134810
👆🏻
19th Energy Level
544.50 kJ/mol715.60 kJ/mol
375.7
148700
👆🏻
20th Energy Level
624.00 kJ/mol715.00 kJ/mol
0
171200
👆🏻
21st Energy Level
544.50 kJ/mol715.60 kJ/mol
375.7
179100
👆🏻
22nd Energy Level
624.00 kJ/mol715.00 kJ/mol
330
184900
👆🏻
23rd Energy Level
544.50 kJ/mol715.60 kJ/mol
357.6
198800
👆🏻
24th Energy Level
544.50 kJ/mol715.60 kJ/mol
297.3
195200
👆🏻
25th Energy Level
544.00 kJ/mol715.00 kJ/mol
0
121900
👆🏻
26th Energy Level
544.50 kJ/mol715.60 kJ/mol
357.6
127700
👆🏻
27th Energy Level
544.50 kJ/mol715.60 kJ/mol
0
133800
👆🏻
28th Energy Level
544.50 kJ/mol715.60 kJ/mol
297.3
139800
👆🏻
29th Energy Level
544.50 kJ/mol715.60 kJ/mol
0
148100
👆🏻
30th Energy Level
544.00 kJ/mol715.00 kJ/mol
0
154500
👆🏻
Electrochemical Equivalent
1.87 g/amp-hr3.87 g/amp-hr
0.16812
8.3209
👆🏻
Electron Work Function
2.70 eV4.25 eV
2.14
6
👆🏻
Other Chemical Properties
Ionization, Radioactive Isotopes
Anti Corrosion, Ionization, Radioactive Isotopes
Atomic Number
6282
3
117
👆🏻
Electron Configuration
[Xe] 4f6 6s2
[Xe] 4f14 5d10 6s2 6p2
Crystal Structure
Rhombohedral (RHO)
Face Centered Cubic (FCC)
Crystal Lattice
Atom
Number of Protons
6282
3
117
👆🏻
Number of Neutrons
88125
4
285
👆🏻
Number of Electrons
6282
3
117
👆🏻
Radius of an Atom
Atomic Radius
180.00 pm175.00 pm
0
348
👆🏻
Covalent Radius
198.00 pm146.00 pm
0
260
👆🏻
Van der Waals Radius
229.00 pm202.00 pm
0
348
👆🏻
Atomic Weight
150.36 amu207.20 amu
6.94
294
👆🏻
Atomic Volume
19.95 cm3/mol18.17 cm3/mol
1.39
71.07
👆🏻
Adjacent Atomic Numbers
Previous Element
Next Element
Valence Electron Potential
44.80 (-eV)24.20 (-eV)
0
392.42
👆🏻
Lattice Constant
362.10 pm495.08 pm
0
891.25
👆🏻
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
1.621.51
0.423
1.9
👆🏻
Density
Density At Room Temperature
7.52 g/cm311.34 g/cm3
0.534
40.7
👆🏻
Density When Liquid (at m.p.)
7.16 g/cm310.66 g/cm3
0.512
41
👆🏻
Tensile Strength
50.00 MPa12.00 MPa
0.1
11000
👆🏻
Viscosity
0.000.00
1.5E-05
0.0035
👆🏻
Vapor Pressure
Vapor Pressure at 1000 K
0.94 (Pa)1.64 (Pa)
0
121
👆🏻
Vapor Pressure at 2000 K
0.00 (Pa)0.00 (Pa)
0
774
👆🏻
Elasticity properties
Shear Modulus
19.50 GPa5.60 GPa
1.3
222
👆🏻
Bulk Modulus
37.80 GPa46.00 GPa
0
462
👆🏻
Young's Modulus
49.70 GPa16.00 GPa
0
528
👆🏻
Poisson Ratio
0.270.44
0.032
0.47
👆🏻
Other Mechanical Properties
-
Ductile, Malleable
Magnetic Characteristics
Specific Gravity
7.5211.35
0.53
4500
👆🏻
Magnetic Ordering
Paramagnetic
Diamagnetic
Permeability
0.00 H/m0.00 H/m
1.25643E-06
0.0063
👆🏻
Susceptibility
0.000.00
-0.000166
200000
👆🏻
Electrical Properties
Electrical Property
Conductor
Poor Conductor
Resistivity
0.94 nΩ·m208.00 nΩ·m
0.1
961
👆🏻
Electrical Conductivity
0.01 106/cm Ω0.05 106/cm Ω
0
0.63
👆🏻
Electron Affinity
50.00 kJ/mol35.10 kJ/mol
0
222.8
👆🏻
Specific Heat
0.20 J/(kg K)0.13 J/(kg K)
0.1
3.6
👆🏻
Molar Heat Capacity
29.54 J/mol·K26.65 J/mol·K
13.1
62.7
👆🏻
Thermal Conductivity
13.30 W/m·K35.30 W/m·K
0
429
👆🏻
Critical Temperature
1,345.00 K600.61 K
26.3
3695
👆🏻
Thermal Expansion
12.70 µm/(m·K)28.90 µm/(m·K)
4.5
97
👆🏻
Enthalpy
Enthalpy of Vaporization
166.40 kJ/mol179.40 kJ/mol
7.32
799.1
👆🏻
Enthalpy of Fusion
8.62 kJ/mol4.77 kJ/mol
2.1
35.23
👆🏻
Enthalpy of Atomization
209.00 kJ/mol194.60 kJ/mol
61.5
837
👆🏻
Standard Molar Entropy
69.60 J/mol.K64.80 J/mol.K
9.5
198.1
👆🏻