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Cesium vs Promethium

Cesium
Promethium
Promethium vs Cesium


Periodic Table
Symbol
Cs   
Pm   
Group Number
1   
17
Not Available   
Period Number
6   
6   
Block
s block   
f block   
Element Family
Alkali   
Lanthanide   
CAS Number
7440462   
40
7440122   
99+
Space Group Name
Im_ 3m   
Not Available   
Space Group Number
229.00   
1
Not Available   
Facts
Interesting Facts
Not Available   
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining   
History
  
  
Who Discovered
Robert Bunsen and Gustav Kirchhoff   
Chien Shiung Wu, Emilio Segrè, Hans Bethe   
Discovery
In 1860   
In 1942   
Abundance
  
  
Abundance In Universe
8 * 10-8 %   
24
Not Available   
Abundance In Sun
~0.0000008 %   
20
~-9999 %   
Abundance In Meteorites
0.00 %   
38
Not Available   
Abundance In Earth's Crust
0.00 %   
35
Not Available   
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.
  
  • It is used for research purpose. Very small amount of this metal is used in atomic batteries.
  • Its radioactive decay is used for a phosphor to give off light. The light emitted is converted into electricity.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys   
NA   
Biological Properties
  
  
Toxicity
Mildly Toxic   
Non Toxic   
Present in Human Body
Yes   
No   
In Blood
0.00 Blood/mg dm-3   
28
0.00 Blood/mg dm-3   
37
In Bone
0.05 p.p.m.   
26
Not Available   
Physical Properties
Melting Point
28.50 °C   
99+
1,042.00 °C   
99+
Boiling Point
678.40 °C   
99+
3,000.00 °C   
31
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Gold   
Unknown   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
0.20   
25
Not Available   
Brinell Hardness
0.14 MPa   
99+
Not Available   
Speed of Sound
Not Available   
Not Available   
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   
Pm   
Isotopes
  
  
Known Isotopes
36   
3
27   
12
Electronegativity
  
  
Pauling Electronegativity
0.79   
99+
Not Available   
Sanderson Electronegativity
0.22   
33
Not Available   
Allred Rochow Electronegativity
0.86   
99+
1.07   
32
Mulliken-Jaffe Electronegativity
0.62   
26
Not Available   
Allen Electronegativity
0.66   
99+
Not Available   
Electropositivity
  
  
Pauling Electropositivity
3.21   
2
Not Available   
Ionization Energies
  
  
1st Energy Level
375.70 kJ/mol   
99+
540.00 kJ/mol   
99+
2nd Energy Level
2,234.30 kJ/mol   
8
1,050.00 kJ/mol   
99+
3rd Energy Level
3,400.00 kJ/mol   
16
2,150.00 kJ/mol   
99+
4th Energy Level
Not Available   
3,970.00 kJ/mol   
38
Electrochemical Equivalent
4.96 g/amp-hr   
3
1.80 g/amp-hr   
36
Electron Work Function
2.14 eV   
99+
Not Available   
Other Chemical Properties
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
55   
99+
61   
99+
Electron Configuration
[Xe] 6s1   
[Xe] 4f5 6s2   
Crystal Structure
Body Centered Cubic (BCC)   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
DHCP-Crystal-Structure-of-Promethium.jpg#100   
Atom
  
  
Number of Protons
55   
99+
61   
99+
Number of Neutrons
78   
99+
84   
40
Number of Electrons
55   
99+
61   
99+
Radius of an Atom
  
  
Atomic Radius
265.00 pm   
1
183.00 pm   
10
Covalent Radius
244.00 pm   
2
199.00 pm   
12
Van der Waals Radius
343.00 pm   
2
236.00 pm   
16
Atomic Weight
132.91 amu   
99+
145.00 amu   
99+
Atomic Volume
71.07 cm3/mol   
1
22.39 cm3/mol   
12
Adjacent Atomic Numbers
  
  
Previous Element
Tin
  
Neodymium
  
Next Element
Barium
  
Samarium
  
Valence Electron Potential
8.62 (-eV)   
99+
44.10 (-eV)   
39
Lattice Constant
614.10 pm   
5
Not Available   
Lattice Angles
π/2, π/2, π/2   
Unknown   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
1.93 g/cm3   
99+
7.26 g/cm3   
99+
Density When Liquid (at m.p.)
1.84 g/cm3   
99+
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Shear Modulus
Not Available   
18.00 GPa   
36
Bulk Modulus
1.60 GPa   
99+
33.00 GPa   
36
Young's Modulus
1.70 GPa   
99+
46.00 GPa   
38
Poisson Ratio
Not Available   
0.28   
17
Other Mechanical Properties
Ductile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
1.87   
99+
7.26   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Semiconductor   
Conductor   
Resistivity
205.00 nΩ·m   
17
0.75 nΩ·m   
99+
Electrical Conductivity
0.05 106/cm Ω   
35
Not Available   
Electron Affinity
45.50 kJ/mol   
25
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
0.24 J/(kg K)   
23
0.18 J/(kg K)   
33
Molar Heat Capacity
32.21 J/mol·K   
4
Not Available   
Thermal Conductivity
35.90 W/m·K   
36
17.90 W/m·K   
99+
Critical Temperature
1,938.00 K   
5
Not Available   
Thermal Expansion
97.00 µm/(m·K)   
1
9.00 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
65.90 kJ/mol   
99+
Not Available   
Enthalpy of Fusion
2.10 kJ/mol   
99+
7.50 kJ/mol   
99+
Enthalpy of Atomization
78.20 kJ/mol   
99+
310.00 kJ/mol   
34
Standard Molar Entropy
85.20 J/mol.K   
3
Not Available   
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