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Cesium vs Osmium

Cesium
Osmium
Osmium vs Cesium


Periodic Table
Symbol
Cs  
Os  
Group Number
1  
17
8  
10
Period Number
6  
6  
Block
s block  
d block  
Element Family
Alkali  
Transition Metal  
CAS Number
7440462  
40
7440042  
99+
Space Group Name
Im_ 3m  
P63/mmc  
Space Group Number
229.00  
1
194.00  
5
Facts
Interesting Facts
Not Available  
  • Osmium metal does not oxidize in air unless it is heated.
  • But if it heated den it forms Osmium Tetroxide, which is highly toxic.
  
Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals  
Found As a By-product, Found in Minerals, Mining  
History
  
  
Who Discovered
Robert Bunsen and Gustav Kirchhoff  
Smithson Tennant  
Discovery
In 1860  
In 1803  
Abundance
  
  
Abundance In Universe
8 * 10-8 %  
24
3 * 10-7 %  
21
Abundance In Sun
~0.0000008 %  
20
~0.0000002 %  
25
Abundance In Meteorites
0.00 %  
38
0.00 %  
28
Abundance In Earth's Crust
0.00 %  
35
0.00 %  
99+
Abundance In Oceans
0.00 %  
17
Not Available  
Abundance In Humans
0.00 %  
17
Not Available  
Uses
Uses & Benefits
  • The most common use of cesium metal is as a drilling fluid. It is also used in optical glass manufacturing.
  • In vacuum tubes and radiation monitor equipment this metal is used as a catalyst promoter.
  
  • 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.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
NA  
NA  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Mildly Toxic  
Highly Toxic  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
28
Not Available  
In Bone
0.05 p.p.m.  
26
Not Available  
Physical Properties
Melting Point
28.50 °C  
99+
3,045.00 °C  
3
Boiling Point
678.40 °C  
99+
5,027.00 °C  
6
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Gold  
Silvery Bluish-Gray  
Luster
NA  
Metallic  
Hardness
  
  
Mohs Hardness
0.20  
25
7.00  
3
Brinell Hardness
0.14 MPa  
99+
3,490.00 MPa  
1
Speed of Sound
Not Available  
4,940.00 m/s  
11
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
Cs  
Os  
Isotopes
  
  
Known Isotopes
36  
3
35  
4
Electronegativity
  
  
Pauling Electronegativity
0.79  
99+
2.20  
4
Sanderson Electronegativity
0.22  
33
Not Available  
Allred Rochow Electronegativity
0.86  
99+
1.52  
12
Mulliken-Jaffe Electronegativity
0.62  
26
Not Available  
Allen Electronegativity
0.66  
99+
1.65  
19
Electropositivity
  
  
Pauling Electropositivity
3.21  
2
1.80  
99+
Ionization Energies
  
  
1st Energy Level
375.70 kJ/mol  
99+
840.00 kJ/mol  
12
2nd Energy Level
2,234.30 kJ/mol  
8
1,309.80 kJ/mol  
99+
3rd Energy Level
3,400.00 kJ/mol  
16
1,600.00 kJ/mol  
99+
Electrochemical Equivalent
4.96 g/amp-hr  
3
1.77 g/amp-hr  
38
Electron Work Function
2.14 eV  
99+
4.83 eV  
8
Other Chemical Properties
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility  
Chemical Stability, Ionization, Solubility  
Atomic Properties
Atomic Number
55  
99+
76  
40
Electron Configuration
[Xe] 6s1  
[Xe] 4f14 5d6 6s2  
Crystal Structure
Body Centered Cubic (BCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
55  
99+
76  
39
Number of Neutrons
78  
99+
114  
25
Number of Electrons
55  
99+
76  
39
Radius of an Atom
  
  
Atomic Radius
265.00 pm  
1
133.80 pm  
99+
Covalent Radius
244.00 pm  
2
Not Available  
Van der Waals Radius
343.00 pm  
2
216.00 pm  
24
Atomic Weight
132.91 amu  
99+
190.23 amu  
35
Atomic Volume
71.07 cm3/mol  
1
8.49 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Tin
  
Rhenium
  
Next Element
Barium
  
Iridium
  
Valence Electron Potential
8.62 (-eV)  
99+
91.40 (-eV)  
12
Lattice Constant
614.10 pm  
5
273.44 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
Not Available  
1.58  
14
Mechanical Properties
Density
  
  
Density At Room Temperature
1.93 g/cm3  
99+
22.59 g/cm3  
9
Density When Liquid (at m.p.)
1.84 g/cm3  
99+
20.00 g/cm3  
1
Tensile Strength
Not Available  
1,000.00 MPa  
4
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available  
0.00 (Pa)  
28
Elasticity properties
  
  
Shear Modulus
Not Available  
222.00 GPa  
1
Bulk Modulus
1.60 GPa  
99+
462.00 GPa  
1
Young's Modulus
1.70 GPa  
99+
Not Available  
Poisson Ratio
Not Available  
0.25  
24
Other Mechanical Properties
Ductile  
Ductile  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
1.87  
99+
22.57  
2
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Semiconductor  
Conductor  
Resistivity
205.00 nΩ·m  
17
81.20 nΩ·m  
35
Electrical Conductivity
0.05 106/cm Ω  
35
0.11 106/cm Ω  
18
Electron Affinity
45.50 kJ/mol  
25
106.10 kJ/mol  
9
Thermal Properties
Specific Heat
0.24 J/(kg K)  
23
0.13 J/(kg K)  
39
Molar Heat Capacity
32.21 J/mol·K  
4
24.70 J/mol·K  
99+
Thermal Conductivity
35.90 W/m·K  
36
87.60 W/m·K  
19
Critical Temperature
1,938.00 K  
5
Not Available  
Thermal Expansion
97.00 µm/(m·K)  
1
5.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
65.90 kJ/mol  
99+
627.60 kJ/mol  
7
Enthalpy of Fusion
2.10 kJ/mol  
99+
29.30 kJ/mol  
4
Enthalpy of Atomization
78.20 kJ/mol  
99+
669.00 kJ/mol  
6
Standard Molar Entropy
85.20 J/mol.K  
3
32.60 J/mol.K  
99+
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