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Lawrencium Francium Comparison


Francium Lawrencium comparison


Periodic Table

Symbol
Lr   
Fr   

Group Number
Not Available   
1   
17

Period Number
7   
7   

Block
d block   
s block   

Element Family
Actinide   
Alkali   

CAS Number
22537195   
15
7440735   
18

Space Group Name
Not Available   
Not Available   

Space Group Number
Not Available   
Not Available   

Facts

Interesting Facts
  • It is synthetically produced metal.
  • Radiation hazard can be produce by it.
  
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  

Sources
Bombarding Californium-252 with Boron Nuclei, Found in Minerals, Mining   
Formed by Decay Process, Mining   

History
  
  

Who Discovered
Lawrence Berkeley National Laboratory and Joint Institute for Nuclear Research   
Marguerite Perey   

Discovery
In 1961–1971   
In 1939   

Abundance
  
  

Uses

Uses & Benefits
  • Currently known uses of Lawrencium metal are limited to research purpose only.
  
  • Francium has no known uses as it has a half life of only 22 minutes.
  

Industrial Uses
NA   
NA   

Medical Uses
NA   
NA   

Other Uses
NA   
NA   

Biological Properties
  
  

Toxicity
Unknown   
NA   

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
0.00 p.p.m.   
36

Physical Properties

Melting Point
1,627.00 °C   
20
27.00 °C   
99+

Boiling Point
Not Available   
677.00 °C   
99+

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silver   
NA   

Luster
Unknown Luster   
NA   

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
Lr   
Fr   

Isotopes
  
  

Known Isotopes
10   
28
33   
6

Electronegativity
  
  

Pauling Electronegativity
Not Available   
0.70   
99+

Allred Rochow Electronegativity
Not Available   
0.86   
99+

Mulliken-Jaffe Electronegativity
Not Available   
0.68   
25

Allen Electronegativity
Not Available   
0.67   
99+

Electropositivity
  
  

Pauling Electropositivity
Not Available   
3.30   
1

Ionization Energies
  
  

1st Energy Level
470.00 kJ/mol   
99+
380.00 kJ/mol   
99+

2nd Energy Level
1,428.00 kJ/mol   
99+
Not Available   

3rd Energy Level
2,228.00 kJ/mol   
99+
Not Available   

4th Energy Level
4,910.00 kJ/mol   
21
Not Available   

Electrochemical Equivalent
3.23 g/amp-hr   
11
8.32 g/amp-hr   
1

Electron Work Function
Not Available   
Not Available   

Other Chemical Properties
Ionization, Radioactive Isotopes   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   

Atomic Properties

Atomic Number
103   
15
87   
31

Electron Configuration
[Rn] 5f14 7s2 7p1   
[Rn] 7s1   

Crystal Structure
Hexagonal Close Packed (HCP)   
Body Centered Cubic (BCC)   

Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
BCC-Crystal-Structure-.jpg#100   

Atom
  
  

Number of Protons
103   
15
87   
31

Number of Neutrons
157   
7
136   
17

Number of Electrons
103   
15
87   
31

Radius of an Atom
  
  

Covalent Radius
Not Available   
260.00 pm   
1

Van der Waals Radius
246.00 pm   
8
348.00 pm   
1

Atomic Weight
266.00 amu   
12
223.00 amu   
27

Atomic Volume
Not Available   
Not Available   

Adjacent Atomic Numbers
  
  

Previous Element
Nobelium
  
Polonium
  

Next Element
Radium
  

Valence Electron Potential
Not Available   
8.00 (-eV)   
99+

Lattice Constant
Not Available   
Not Available   

Lattice Angles
NA   
NA   

Lattice C/A Ratio
Not Available   
Not Available   

Mechanical Properties

Density
  
  

Density At Room Temperature
Not Available   
1.87 g/cm3   
99+

Tensile Strength
Not Available   
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Elasticity properties
  
  

Poisson Ratio
0.32   
12
Not Available   

Other Mechanical Properties
Unknown   
NA   

Magnetic Properties

Magnetic Characteristics
  
  

Magnetic Ordering
Unknown   
Paramagnetic   

Electrical Properties
  
  

Electrical Property
Unknown   
Poor Conductor   

Resistivity
Not Available   
3.00 nΩ·m   
99+

Electrical Conductivity
Not Available   
0.03 106/cm Ω   
40

Thermal Properties

Specific Heat
Not Available   
Not Available   

Molar Heat Capacity
Not Available   
Not Available   

Thermal Conductivity
Not Available   
15.00 W/m·K   
99+

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
Not Available   
Not Available   

Enthalpy
  
  

Enthalpy of Atomization
Not Available   
71.00 kJ/mol   
99+

Standard Molar Entropy
Not Available   
Not Available   

Summary >>
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