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Samarium vs Chromium

Samarium
Chromium
Chromium vs Samarium


Periodic Table
Symbol
Sm   
Cr   
Group Number
Not Available   
6   
12
Period Number
6   
4   
Block
f block   
d block   
Element Family
Lanthanide   
Transition Metal   
CAS Number
7440199   
99+
7440473   
39
Space Group Name
R_ 3m   
Im_ 3m   
Space Group Number
166.00   
6
229.00   
1
Facts
Interesting Facts
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
  
  • Chromium is highly reactive, hence it is not found free in nature.
  • Ores of Chromites mineral are the major source of Chromium metal.
  • Almost 90% leather tanning is done with the help of chromium.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining, Ores of metals, Ores of Minerals   
History
  
  
Who Discovered
Lecoq de Boisbaudran   
Louis Nicolas Vauquelin   
Discovery
In 1879   
In Between 1797 - 1798   
Abundance
  
  
Abundance In Universe
5 * 10-7 %   
19
1.5 * 10-3 %   
7
Abundance In Sun
~0.0000001 %   
26
~0.002 %   
7
Abundance In Meteorites
0.00 %   
37
0.30 %   
7
Abundance In Earth's Crust
0.00 %   
29
0.01 %   
13
Abundance In Oceans
0.00 %   
40
0.00 %   
16
Abundance In Humans
Not Available   
0.00 %   
16
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 used to harden the steel and produces a stainless steel and other various alloys.
  • It is also used to give proper finish to polished mirrors. Its chromium plates are used in bathroom fittings.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Automobile Industry, Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, In Nuclear Reactors   
Alloys   
Biological Properties
  
  
Toxicity
Slightly Toxic   
Highly Toxic   
Present in Human Body
Yes   
Yes   
In Blood
0.01 Blood/mg dm-3   
22
0.11 Blood/mg dm-3   
12
In Bone
Not Available   
0.33 p.p.m.   
21
Physical Properties
Melting Point
1,072.00 °C   
99+
1,857.00 °C   
14
Boiling Point
1,900.00 °C   
99+
2,672.00 °C   
39
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silver   
Luster
Lustrous   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
8.50   
1
Brinell Hardness
441.00 MPa   
27
687.00 MPa   
16
Vickers Hardness
412.00 MPa   
24
1,060.00 MPa   
10
Speed of Sound
2,130.00 m/s   
99+
5,940.00 m/s   
5
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   
Cr   
Isotopes
  
  
Known Isotopes
30   
9
21   
18
Electronegativity
  
  
Pauling Electronegativity
1.17   
40
1.66   
18
Sanderson Electronegativity
Not Available   
1.66   
14
Allred Rochow Electronegativity
1.07   
32
1.56   
10
Allen Electronegativity
Not Available   
1.65   
19
Electropositivity
  
  
Pauling Electropositivity
2.83   
14
2.34   
36
Ionization Energies
  
  
1st Energy Level
544.50 kJ/mol   
99+
26,130.00 kJ/mol   
1
2nd Energy Level
1,070.00 kJ/mol   
99+
28,750.00 kJ/mol   
1
3rd Energy Level
2,260.00 kJ/mol   
99+
34,230.00 kJ/mol   
1
4th Energy Level
3,990.00 kJ/mol   
37
37,066.00 kJ/mol   
1
5th Energy Level
Not Available   
97,510.00 kJ/mol   
1
6th Energy Level
Not Available   
105,800.00 kJ/mol   
1
7th Energy level
Not Available   
114,300.00 kJ/mol   
1
8th Energy Level
Not Available   
125,300.00 kJ/mol   
1
9th Energy Level
Not Available   
134,700.00 kJ/mol   
1
10th Energy Level
Not Available   
144,300.00 kJ/mol   
1
11th Energy Level
Not Available   
26,130.00 kJ/mol   
12
12th Energy Level
Not Available   
28,750.00 kJ/mol   
13
13th Energy Level
Not Available   
34,230.00 kJ/mol   
10
14th Energy Level
Not Available   
37,066.00 kJ/mol   
12
15th Energy Level
Not Available   
97,510.00 kJ/mol   
1
16th Energy Level
Not Available   
105,800.00 kJ/mol   
2
17th Energy Level
Not Available   
114,300.00 kJ/mol   
3
18th Energy Level
Not Available   
125,300.00 kJ/mol   
4
19th Energy Level
Not Available   
134,700.00 kJ/mol   
5
20th Energy Level
Not Available   
144,300.00 kJ/mol   
7
21st Energy Level
Not Available   
157,700.00 kJ/mol   
7
22nd Energy Level
Not Available   
166,090.00 kJ/mol   
6
Electrochemical Equivalent
1.87 g/amp-hr   
34
0.32 g/amp-hr   
99+
Electron Work Function
2.70 eV   
99+
4.50 eV   
14
Other Chemical Properties
Ionization, Radioactive Isotopes   
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
62   
99+
24   
99+
Electron Configuration
[Xe] 4f6 6s2   
[Ar] 3d5 4s1   
Crystal Structure
Rhombohedral (RHO)   
Body Centered Cubic (BCC)   
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
62   
99+
24   
99+
Number of Neutrons
88   
39
28   
99+
Number of Electrons
62   
99+
24   
99+
Radius of an Atom
  
  
Atomic Radius
180.00 pm   
14
128.00 pm   
99+
Covalent Radius
198.00 pm   
13
139.00 pm   
99+
Van der Waals Radius
229.00 pm   
20
200.00 pm   
28
Atomic Weight
150.36 amu   
99+
52.00 amu   
99+
Atomic Volume
19.95 cm3/mol   
19
7.23 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Promethium
  
Vanadium
  
Next Element
Europium
  
Manganese
  
Valence Electron Potential
44.80 (-eV)   
37
170.00 (-eV)   
4
Lattice Constant
362.10 pm   
33
291.00 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+
7.19 g/cm3   
99+
Density When Liquid (at m.p.)
7.16 g/cm3   
32
6.30 g/cm3   
40
Tensile Strength
Not Available   
689.00 MPa   
7
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.94 (Pa)   
9
0.00 (Pa)   
24
Vapor Pressure at 2000 K
Not Available   
774.00 (Pa)   
1
Elasticity properties
  
  
Shear Modulus
19.50 GPa   
34
115.00 GPa   
9
Bulk Modulus
37.80 GPa   
35
160.00 GPa   
11
Young's Modulus
49.70 GPa   
37
279.00 GPa   
8
Poisson Ratio
0.27   
19
0.21   
32
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.52   
99+
7.19   
99+
Magnetic Ordering
Paramagnetic   
Antiferromagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
0.94 nΩ·m   
99+
125.00 nΩ·m   
27
Electrical Conductivity
0.01 106/cm Ω   
99+
0.08 106/cm Ω   
25
Electron Affinity
50.00 kJ/mol   
21
64.30 kJ/mol   
15
Thermal Properties
Specific Heat
0.20 J/(kg K)   
31
0.45 J/(kg K)   
12
Molar Heat Capacity
29.54 J/mol·K   
7
23.35 J/mol·K   
99+
Thermal Conductivity
13.30 W/m·K   
99+
93.90 W/m·K   
17
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
12.70 µm/(m·K)   
30
4.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
166.40 kJ/mol   
99+
348.80 kJ/mol   
24
Enthalpy of Fusion
8.62 kJ/mol   
40
15.31 kJ/mol   
20
Enthalpy of Atomization
209.00 kJ/mol   
99+
397.50 kJ/mol   
21
Standard Molar Entropy
69.60 J/mol.K   
15
23.80 J/mol.K   
99+
Periodic Table >>
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