Symbol
Lr
  
Fr
  
Group Number
Not Available
  
Period Number
7
  
7
  
Block
d block
  
s block
  
Element Family
Actinide
  
Alkali
  
Space Group Name
Not Available
  
Not Available
  
Space Group Number
Not Available
  
Not Available
  
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 & 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
Melting Point
1,627.00 °C
  
20
Boiling Point
Not Available
  
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 Formula
Lr
  
Fr
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Not Available
  
Allred Rochow Electronegativity
Not Available
  
Mulliken-Jaffe Electronegativity
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Not Available
  
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
  
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
  
  
Radius of an Atom
  
  
Covalent Radius
Not Available
  
Atomic Volume
Not Available
  
Not Available
  
Adjacent Atomic Numbers
  
  
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
  
Density
  
  
Density At Room Temperature
Not Available
  
1.87 g/cm
3
  
99+
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
Unknown
  
NA
  
Magnetic Characteristics
  
  
Magnetic Ordering
Unknown
  
Paramagnetic
  
Electrical Properties
  
  
Electrical Property
Unknown
  
Poor Conductor
  
Resistivity
Not Available
  
Electrical Conductivity
Not Available
  
0.03 10
6/cm Ω
  
40
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