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Osmium vs Cerium

Osmium
Cerium
Cerium vs Osmium


Periodic Table
Symbol
Os   
Ce   
Group Number
8   
10
Not Available   
Period Number
6   
6   
Block
d block   
f block   
Element Family
Transition Metal   
Lanthanide   
CAS Number
7440042   
99+
7440451   
99+
Space Group Name
P63/mmc   
P63/mmc   
Space Group Number
194.00   
5
194.00   
5
Facts
Interesting Facts
  • Osmium metal does not oxidize in air unless it is heated.
  • But if it heated den it forms Osmium Tetroxide, which is highly toxic.
  
  • Cerium is a rare earth metal but still it is not rare at all.
  • It’s non-toxic compound Cerium sulfide has a rich red color and it is used as a pigment.
  • Cerium metal is also used in Flat screen TVs, light bulb, floodlights, etc.
  
Sources
Found As a By-product, Found in Minerals, Mining   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Smithson Tennant   
Martin Heinrich Klaproth, Jöns Jakob Berzelius, Wilhelm Hisinger   
Discovery
In 1803   
In 1803   
Abundance
  
  
Abundance In Universe
3 * 10-7 %   
21
1 * 10-6 %   
16
Abundance In Sun
~0.0000002 %   
25
~0.0000004 %   
23
Abundance In Meteorites
0.00 %   
28
0.00 %   
27
Abundance In Earth's Crust
0.00 %   
99+
0.01 %   
18
Abundance In Oceans
Not Available   
0.00 %   
33
Uses
Uses & Benefits
  • Its has very limited uses and its alloys are very hard and are used in the manufacturing of pen tips, pivots, needles and electrical contacts.
  • It is also used as industrial catalyst to speed up the chemical reaction.
  
  • It is used to include flints for cigarette lighters.
  • Its compound Cerium (Ill) Oxide is used as a catalyst; it is put inside the walls of the oven as it prevents from the buildup of cooking residues.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Chemical Industry   
Medical Uses
NA   
Medical Research   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Highly Toxic   
Moderately Toxic   
Present in Human Body
No   
Yes   
In Blood
Not Available   
0.00 Blood/mg dm-3   
30
In Bone
Not Available   
2.70 p.p.m.   
14
Physical Properties
Melting Point
3,045.00 °C   
3
795.00 °C   
99+
Boiling Point
5,027.00 °C   
6
3,257.00 °C   
23
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Bluish-Gray   
Silvery White   
Luster
Metallic   
Lustrous   
Hardness
  
  
Mohs Hardness
7.00   
3
2.50   
14
Brinell Hardness
3,490.00 MPa   
1
186.00 MPa   
99+
Vickers Hardness
Not Available   
210.00 MPa   
32
Speed of Sound
4,940.00 m/s   
11
2,100.00 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
Os   
Ce   
Isotopes
  
  
Known Isotopes
35   
4
30   
9
Electronegativity
  
  
Pauling Electronegativity
2.20   
4
1.12   
99+
Allred Rochow Electronegativity
1.52   
12
1.08   
31
Allen Electronegativity
1.65   
19
Not Available   
Electropositivity
  
  
Pauling Electropositivity
1.80   
99+
2.88   
11
Ionization Energies
  
  
1st Energy Level
840.00 kJ/mol   
12
534.40 kJ/mol   
99+
2nd Energy Level
1,309.80 kJ/mol   
99+
1,050.00 kJ/mol   
99+
3rd Energy Level
1,600.00 kJ/mol   
99+
1,949.00 kJ/mol   
99+
4th Energy Level
Not Available   
3,547.00 kJ/mol   
99+
5th Energy Level
Not Available   
6,325.00 kJ/mol   
22
6th Energy Level
Not Available   
7,490.00 kJ/mol   
21
Electrochemical Equivalent
1.77 g/amp-hr   
38
1.74 g/amp-hr   
99+
Electron Work Function
4.83 eV   
8
2.84 eV   
39
Other Chemical Properties
Chemical Stability, Ionization, Solubility   
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
76   
40
58   
99+
Electron Configuration
[Xe] 4f14 5d6 6s2   
[Xe] 4f1 5d1 6s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
DHCP-Crystal-Structure-of-Cerium.jpg#100   
Atom
  
  
Number of Protons
76   
39
58   
99+
Number of Neutrons
114   
25
82   
99+
Number of Electrons
76   
39
58   
99+
Radius of an Atom
  
  
Atomic Radius
133.80 pm   
99+
181.80 pm   
12
Covalent Radius
Not Available   
204.00 pm   
8
Van der Waals Radius
216.00 pm   
24
235.00 pm   
17
Atomic Weight
190.23 amu   
35
140.12 amu   
99+
Atomic Volume
8.49 cm3/mol   
99+
20.67 cm3/mol   
17
Adjacent Atomic Numbers
  
  
Previous Element
Rhenium
  
Lanthanum
  
Next Element
Iridium
  
Praseodymium
  
Valence Electron Potential
91.40 (-eV)   
12
41.78 (-eV)   
99+
Lattice Constant
273.44 pm   
99+
362.00 pm   
34
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
1.58   
14
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
22.59 g/cm3   
9
6.77 g/cm3   
99+
Density When Liquid (at m.p.)
20.00 g/cm3   
1
6.55 g/cm3   
38
Tensile Strength
1,000.00 MPa   
4
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
34
Vapor Pressure at 2000 K
0.00 (Pa)   
28
1.04 (Pa)   
13
Elasticity properties
  
  
Shear Modulus
222.00 GPa   
1
13.50 GPa   
99+
Bulk Modulus
462.00 GPa   
1
21.50 GPa   
99+
Young's Modulus
Not Available   
33.60 GPa   
99+
Poisson Ratio
0.25   
24
0.24   
27
Other Mechanical Properties
Ductile   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
22.57   
2
6.77   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
81.20 nΩ·m   
35
828.00 nΩ·m   
3
Electrical Conductivity
0.11 106/cm Ω   
18
0.01 106/cm Ω   
99+
Electron Affinity
106.10 kJ/mol   
9
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
0.13 J/(kg K)   
39
0.19 J/(kg K)   
32
Molar Heat Capacity
24.70 J/mol·K   
99+
26.94 J/mol·K   
23
Thermal Conductivity
87.60 W/m·K   
19
11.30 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
5.10 µm/(m·K)   
99+
6.30 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
627.60 kJ/mol   
7
414.00 kJ/mol   
16
Enthalpy of Fusion
29.30 kJ/mol   
4
5.46 kJ/mol   
99+
Enthalpy of Atomization
669.00 kJ/mol   
6
381.00 kJ/mol   
23
Standard Molar Entropy
32.60 J/mol.K   
99+
72.00 J/mol.K   
12
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