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Francium vs Promethium

Francium
Promethium
Promethium vs Francium


Periodic Table
Symbol
Fr   
Pm   
Group Number
1   
17
Not Available   
Period Number
7   
6   
Block
s block   
f block   
Element Family
Alkali   
Lanthanide   
CAS Number
7440735   
18
7440122   
99+
Space Group Name
Not Available   
Not Available   
Space Group Number
Not Available   
Not Available   
Facts
Interesting Facts
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
Sources
Formed by Decay Process, Mining   
Found in Minerals, Mining   
History
  
  
Who Discovered
Marguerite Perey   
Chien Shiung Wu, Emilio Segrè, Hans Bethe   
Discovery
In 1939   
In 1942   
Abundance
  
  
Uses
Uses & Benefits
  • Francium has no known uses as it has a half life of only 22 minutes.
  
  • 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
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
NA   
NA   
Biological Properties
  
  
Toxicity
NA   
Non Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
37
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
27.00 °C   
99+
1,042.00 °C   
99+
Boiling Point
677.00 °C   
99+
3,000.00 °C   
31
Appearance
  
  
Physical State
Solid   
Solid   
Color
NA   
Unknown   
Luster
NA   
Metallic   
Hardness
  
  
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
Fr   
Pm   
Isotopes
  
  
Known Isotopes
33   
6
27   
12
Electronegativity
  
  
Pauling Electronegativity
0.70   
99+
Not Available   
Allred Rochow Electronegativity
0.86   
99+
1.07   
32
Mulliken-Jaffe Electronegativity
0.68   
25
Not Available   
Allen Electronegativity
0.67   
99+
Not Available   
Electropositivity
  
  
Pauling Electropositivity
3.30   
1
Not Available   
Ionization Energies
  
  
1st Energy Level
380.00 kJ/mol   
99+
540.00 kJ/mol   
99+
2nd Energy Level
Not Available   
1,050.00 kJ/mol   
99+
3rd Energy Level
Not Available   
2,150.00 kJ/mol   
99+
4th Energy Level
Not Available   
3,970.00 kJ/mol   
38
Electrochemical Equivalent
8.32 g/amp-hr   
1
1.80 g/amp-hr   
36
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
87   
31
61   
99+
Electron Configuration
[Rn] 7s1   
[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
87   
31
61   
99+
Number of Neutrons
136   
17
84   
40
Number of Electrons
87   
31
61   
99+
Radius of an Atom
  
  
Atomic Radius
Not Available   
183.00 pm   
10
Covalent Radius
260.00 pm   
1
199.00 pm   
12
Van der Waals Radius
348.00 pm   
1
236.00 pm   
16
Atomic Weight
223.00 amu   
27
145.00 amu   
99+
Atomic Volume
Not Available   
22.39 cm3/mol   
12
Adjacent Atomic Numbers
  
  
Previous Element
Polonium
  
Neodymium
  
Next Element
Radium
  
Samarium
  
Valence Electron Potential
8.00 (-eV)   
99+
44.10 (-eV)   
39
Lattice Constant
Not Available   
Not Available   
Lattice Angles
NA   
Unknown   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
1.87 g/cm3   
99+
7.26 g/cm3   
99+
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
Not Available   
33.00 GPa   
36
Young's Modulus
Not Available   
46.00 GPa   
38
Poisson Ratio
Not Available   
0.28   
17
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
7.26   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Poor Conductor   
Conductor   
Resistivity
3.00 nΩ·m   
99+
0.75 nΩ·m   
99+
Electrical Conductivity
0.03 106/cm Ω   
40
Not Available   
Electron Affinity
Not Available   
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
Not Available   
0.18 J/(kg K)   
33
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
15.00 W/m·K   
99+
17.90 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
9.00 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Fusion
Not Available   
7.50 kJ/mol   
99+
Enthalpy of Atomization
71.00 kJ/mol   
99+
310.00 kJ/mol   
34
Standard Molar Entropy
Not Available   
Not Available   
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