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Samarium vs Lead

Samarium
Lead
Lead vs Samarium


Periodic Table
Symbol
Sm   
Pb   
Group Number
Not Available   
14   
4
Period Number
6   
6   
Block
f block   
p block   
Element Family
Lanthanide   
Post-​Transition   
CAS Number
7440199   
99+
7439921   
99+
Space Group Name
R_ 3m   
Fm_ 3m   
Space Group Number
166.00   
6
225.00   
2
Facts
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   
Unknown   
Discovery
In 1879   
In Middle Easterns (7000 BCE)   
Abundance
  
  
Abundance In Universe
5 * 10-7 %   
19
1 * 10-6 %   
16
Abundance In Sun
~0.0000001 %   
26
~0.000001 %   
18
Abundance In Meteorites
0.00 %   
37
0.00 %   
23
Abundance In Earth's Crust
0.00 %   
29
0.00 %   
26
Abundance In Oceans
0.00 %   
40
0.00 %   
22
Abundance In Humans
Not Available   
0.00 %   
8
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.
  
  • 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
NA   
Surgical Instruments Manufacturing   
Other Uses
Alloys, In Nuclear Reactors   
Alloys   
Biological Properties
  
  
Toxicity
Slightly Toxic   
Toxic   
Present in Human Body
Yes   
Yes   
In Blood
0.01 Blood/mg dm-3   
22
0.21 Blood/mg dm-3   
11
In Bone
Not Available   
30.00 p.p.m.   
10
Physical Properties
Melting Point
1,072.00 °C   
99+
327.50 °C   
99+
Boiling Point
1,900.00 °C   
99+
1,740.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Gray   
Luster
Lustrous   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
1.50   
18
Brinell Hardness
441.00 MPa   
27
38.00 MPa   
99+
Vickers Hardness
412.00 MPa   
24
Not Available   
Speed of Sound
2,130.00 m/s   
99+
1,190.00 m/s   
99+
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   
Pb   
Isotopes
  
  
Known Isotopes
30   
9
35   
4
Electronegativity
  
  
Pauling Electronegativity
1.17   
40
1.87   
13
Sanderson Electronegativity
Not Available   
2.29   
4
Allred Rochow Electronegativity
1.07   
32
1.55   
11
Mulliken-Jaffe Electronegativity
Not Available   
2.41   
2
Allen Electronegativity
Not Available   
1.85   
8
Electropositivity
  
  
Pauling Electropositivity
2.83   
14
1.67   
99+
Ionization Energies
  
  
1st Energy Level
544.50 kJ/mol   
99+
715.60 kJ/mol   
31
2nd Energy Level
1,070.00 kJ/mol   
99+
1,450.50 kJ/mol   
99+
3rd Energy Level
2,260.00 kJ/mol   
99+
3,081.50 kJ/mol   
23
4th Energy Level
3,990.00 kJ/mol   
37
4,083.00 kJ/mol   
35
5th Energy Level
Not Available   
6,640.00 kJ/mol   
20
Electrochemical Equivalent
1.87 g/amp-hr   
34
3.87 g/amp-hr   
9
Electron Work Function
2.70 eV   
99+
4.25 eV   
21
Other Chemical Properties
Ionization, Radioactive Isotopes   
Anti Corrosion, Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
62   
99+
82   
34
Electron Configuration
[Xe] 4f6 6s2   
[Xe] 4f14 5d10 6s2 6p2   
Crystal Structure
Rhombohedral (RHO)   
Face Centered Cubic (FCC)   
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100   
FCC-Crystal-Structure-of-Lead.jpg#100   
Atom
  
  
Number of Protons
62   
99+
82   
34
Number of Neutrons
88   
39
125   
19
Number of Electrons
62   
99+
82   
34
Radius of an Atom
  
  
Atomic Radius
180.00 pm   
14
175.00 pm   
19
Covalent Radius
198.00 pm   
13
146.00 pm   
38
Van der Waals Radius
229.00 pm   
20
202.00 pm   
27
Atomic Weight
150.36 amu   
99+
207.20 amu   
30
Atomic Volume
19.95 cm3/mol   
19
18.17 cm3/mol   
27
Adjacent Atomic Numbers
  
  
Previous Element
Promethium
  
Thallium
  
Next Element
Europium
  
Bismuth
  
Valence Electron Potential
44.80 (-eV)   
37
24.20 (-eV)   
99+
Lattice Constant
362.10 pm   
33
495.08 pm   
16
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+
11.34 g/cm3   
33
Density When Liquid (at m.p.)
7.16 g/cm3   
32
10.66 g/cm3   
15
Tensile Strength
Not Available   
12.00 MPa   
20
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.94 (Pa)   
9
1.64 (Pa)   
7
Elasticity properties
  
  
Shear Modulus
19.50 GPa   
34
5.60 GPa   
99+
Bulk Modulus
37.80 GPa   
35
46.00 GPa   
24
Young's Modulus
49.70 GPa   
37
16.00 GPa   
99+
Poisson Ratio
0.27   
19
0.44   
3
Other Mechanical Properties
NA   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.52   
99+
11.35   
25
Magnetic Ordering
Paramagnetic   
Diamagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Poor Conductor   
Resistivity
0.94 nΩ·m   
99+
208.00 nΩ·m   
16
Electrical Conductivity
0.01 106/cm Ω   
99+
0.05 106/cm Ω   
36
Electron Affinity
50.00 kJ/mol   
21
35.10 kJ/mol   
28
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
26.65 J/mol·K   
26
Thermal Conductivity
13.30 W/m·K   
99+
35.30 W/m·K   
38
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
12.70 µm/(m·K)   
30
28.90 µm/(m·K)   
13
Enthalpy
  
  
Enthalpy of Vaporization
166.40 kJ/mol   
99+
179.40 kJ/mol   
99+
Enthalpy of Fusion
8.62 kJ/mol   
40
4.77 kJ/mol   
99+
Enthalpy of Atomization
209.00 kJ/mol   
99+
194.60 kJ/mol   
99+
Standard Molar Entropy
69.60 J/mol.K   
15
64.80 J/mol.K   
17
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