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Cs Element
Cesium


Periodic Table
0
Symbol
Cs 0
Group Number
1 17
Period Number
6 2
Block
s block 0
Element Family
Alkali 0
CAS Number
7440462 40
Space Group Name
Im_ 3m 0
Space Group Number
229.00 1
Facts
0
Interesting Facts
Not Available 0
Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals 0
History
0
Who Discovered
Robert Bunsen and Gustav Kirchhoff 0
Discovery
In 1860 0
Abundance
0
Abundance In Universe
8 * 10-8 % 24
Abundance In Sun
~0.0000008 % 20
Abundance In Meteorites
0.00 % 38
Abundance In Earth's Crust
0.00 % 35
Abundance In Oceans
0.00 % 17
Abundance In Humans
0.00 % 17
Uses
0
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.
0
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry 0
Medical Uses
NA 0
Other Uses
Alloys 0
Biological Properties
0
Toxicity
Mildly Toxic 0
Present in Human Body
Yes 0
In Blood
0.00 Blood/mg dm-3 28
In Bone
0.05 p.p.m. 26
Physical
0
Melting Point
28.50 °C 80
Boiling Point
678.40 °C 75
Appearance
0
Physical State
Solid 0
Color
Silvery Gold 0
Luster
NA 0
Hardness
0
Mohs Hardness
0.20 25
Brinell Hardness
0.14 MPa 56
Vickers Hardness
Not Available 0
Speed of Sound
Not Available 0
Optical Properties
0
Refractive Index
Not Available 0
Reflectivity
Not Available 0
Allotropes
No 0
α Allotropes
Not Available 0
β Allotropes
Not Available 0
γ Allotropes
Not Available 0
Chemical
0
Chemical Formula
Cs 0
Isotopes
0
Known Isotopes
36 3
Electronegativity
0
Pauling Electronegativity
0.79 52
Sanderson Electronegativity
0.22 33
Allred Rochow Electronegativity
0.86 41
Mulliken-Jaffe Electronegativity
0.62 26
Allen Electronegativity
0.66 48
Electropositivity
0
Pauling Electropositivity
3.21 2
Ionization Energies
0
1st Energy Level
375.70 kJ/mol 90
2nd Energy Level
2,234.30 kJ/mol 8
3rd Energy Level
3,400.00 kJ/mol 16
4th Energy Level
Not Available 0
5th Energy Level
Not Available 0
6th Energy Level
Not Available 0
7th Energy level
Not Available 0
8th Energy Level
Not Available 0
9th Energy Level
Not Available 0
10th Energy Level
Not Available 0
11th Energy Level
Not Available 0
12th Energy Level
Not Available 0
13th Energy Level
Not Available 0
14th Energy Level
Not Available 0
15th Energy Level
Not Available 0
16th Energy Level
Not Available 0
17th Energy Level
Not Available 0
18th Energy Level
Not Available 0
19th Energy Level
Not Available 0
20th Energy Level
Not Available 0
21st Energy Level
Not Available 0
22nd Energy Level
Not Available 0
23rd Energy Level
Not Available 0
24th Energy Level
Not Available 0
25th Energy Level
Not Available 0
26th Energy Level
Not Available 0
27th Energy Level
Not Available 0
28th Energy Level
Not Available 0
29th Energy Level
Not Available 0
30th Energy Level
Not Available 0
Electrochemical Equivalent
4.96 g/amp-hr 3
Electron Work Function
2.14 eV 46
Other Chemical Properties
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility 0
Atomic
0
Atomic Number
55 61
Electron Configuration
[Xe] 6s1 0
Crystal Structure
Body Centered Cubic (BCC) 0
Crystal Lattice
BCC-Crystal-Structure-.jpg#100 0
Atom
0
Number of Protons
55 60
Number of Neutrons
78 43
Number of Electrons
55 60
Radius of an Atom
0
Atomic Radius
265.00 pm 1
Covalent Radius
244.00 pm 2
Van der Waals Radius
343.00 pm 2
Atomic Weight
132.91 amu 55
Atomic Volume
71.07 cm3/mol 1
Adjacent Atomic Numbers
0
Previous Element
2 0
Next Element
28 0
Valence Electron Potential
8.62 (-eV) 66
Lattice Constant
614.10 pm 5
Lattice Angles
π/2, π/2, π/2 0
Lattice C/A Ratio
Not Available 0
Mechanical
0
Density
0
Density At Room Temperature
1.93 g/cm3 76
Density When Liquid (at m.p.)
1.84 g/cm3 53
Tensile Strength
Not Available 0
Viscosity
Not Available 0
Vapor Pressure
0
Vapor Pressure at 1000 K
Not Available 0
Vapor Pressure at 2000 K
Not Available 0
Elasticity properties
0
Shear Modulus
Not Available 0
Bulk Modulus
1.60 GPa 50
Young's Modulus
1.70 GPa 58
Poisson Ratio
Not Available 0
Other Mechanical Properties
Ductile 0
Magnetic
0
Magnetic Characteristics
0
Specific Gravity
1.87 64
Magnetic Ordering
Paramagnetic 0
Permeability
Not Available 0
Susceptibility
Not Available 0
Electrical Properties
0
Electrical Property
Semiconductor 0
Resistivity
205.00 nΩ·m 17
Electrical Conductivity
0.05 106/cm Ω 35
Electron Affinity
45.50 kJ/mol 25
Thermal
0
Specific Heat
0.24 J/(kg K) 23
Molar Heat Capacity
32.21 J/mol·K 4
Thermal Conductivity
35.90 W/m·K 36
Critical Temperature
1,938.00 K 5
Thermal Expansion
97.00 µm/(m·K) 1
Enthalpy
0
Enthalpy of Vaporization
65.90 kJ/mol 57
Enthalpy of Fusion
2.10 kJ/mol 63
Enthalpy of Atomization
78.20 kJ/mol 60
Standard Molar Entropy
85.20 J/mol.K 3
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