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Cesium Properties
Cesium


Physical
0
Melting Point
28.50 °C 80
Boiling Point
678.40 °C 75
Hardness
0
Mohs Hardness
0.20 25
Brinell Hardness
0.14 MPa 56
Vickers Hardness
Not Available 0
Optical Properties
0
Refractive Index
Not Available 0
Reflectivity
Not Available 0
Speed of Sound
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
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
Mechanical
0
Density
0
Density At Room Temperature
1.93 g/cm3 76
Density When Liquid (at m.p.)
1.84 g/cm3 53
Vapor Pressure
0
Vapor Pressure at 1000 K
Not Available 0
Vapor Pressure at 2000 K
Not Available 0
Tensile Strength
Not Available 0
Viscosity
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
Periodic Table
0
Symbol
Cs 0
Group Number
1 17
Period Number
6 2
Block
s block 0
Element Family
Alkali 0
Atomic
0
Atomic Number
55 61
Atomic Weight
132.91 amu 55
Atomic Volume
71.07 cm3/mol 1
Electron Configuration
[Xe] 6s1 0
Valence Electron Potential
8.62 (-eV) 66
Atom
0
Number of Protons
55 60
Number of Neutrons
78 43
Number of Electrons
55 60
Crystal Structure
Body Centered Cubic (BCC) 0
Crystal Lattice
BCC-Crystal-Structure-.jpg#100 0
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
Lattice Constant
614.10 pm 5
Lattice Angles
π/2, π/2, π/2 0
Lattice C/A Ratio
Not Available 0
Adjacent Atomic Numbers
0
Next Element
28 0
Previous Element
2 0
Magnetic
0
Electrical Properties
0
Resistivity
205.00 nΩ·m 17
Electrical Conductivity
0.05 106/cm Ω 35
Electron Affinity
45.50 kJ/mol 25
Electrical Property
Semiconductor 0
Magnetic Characteristics
0
Specific Gravity
1.87 64
Magnetic Ordering
Paramagnetic 0
Permeability
Not Available 0
Susceptibility
Not Available 0
Thermal
0
Specific Heat
0.24 J/(kg K) 23
Thermal Conductivity
35.90 W/m·K 36
Critical Temperature
1,938.00 K 5
Molar Heat Capacity
32.21 J/mol·K 4
Thermal Expansion
97.00 µm/(m·K) 1
Standard Molar Entropy
85.20 J/mol.K 3
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
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