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What is Francium?
Francium


Periodic Table
0
Symbol
Fr 0
Group Number
1 17
Period Number
7 1
Block
s block 0
Element Family
Alkali 0
CAS Number
7440735 18
Space Group Name
Not Available 0
Space Group Number
Not Available 0
Facts
0
Interesting Facts
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
0
Sources
Formed by Decay Process, Mining 0
History
0
Who Discovered
Marguerite Perey 0
Discovery
In 1939 0
Abundance
0
Abundance In Universe
Not Available 0
Abundance In Sun
~-9999 % 0
Abundance In Meteorites
Not Available 0
Abundance In Earth's Crust
Not Available 0
Abundance In Oceans
Not Available 0
Abundance In Humans
Not Available 0
Uses
0
Uses & Benefits
  • Francium has no known uses as it has a half life of only 22 minutes.
0
Industrial Uses
NA 0
Medical Uses
NA 0
Other Uses
NA 0
Biological Properties
0
Toxicity
NA 0
Present in Human Body
No 0
In Blood
0.00 Blood/mg dm-3 37
In Bone
0.00 p.p.m. 36
Physical
0
Melting Point
27.00 °C 81
Boiling Point
677.00 °C 76
Appearance
0
Physical State
Solid 0
Color
NA 0
Luster
NA 0
Hardness
0
Mohs Hardness
Not Available 0
Brinell Hardness
Not Available 0
Vickers Hardness
Not Available 0
Speed of Sound
Not Available 0
Optical Properties
0
Refractive Index
Not Available 0
Reflectivity
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
Fr 0
Isotopes
0
Known Isotopes
33 6
Electronegativity
0
Pauling Electronegativity
0.70 53
Sanderson Electronegativity
Not Available 0
Allred Rochow Electronegativity
0.86 41
Mulliken-Jaffe Electronegativity
0.68 25
Allen Electronegativity
0.67 47
Electropositivity
0
Pauling Electropositivity
3.30 1
Ionization Energies
0
1st Energy Level
380.00 kJ/mol 89
2nd Energy Level
Not Available 0
3rd Energy Level
Not Available 0
4th Energy Level
Not Available 0
5th Energy Level
Not Available 0
6th Energy Level
Not Available 0
7th Energy level
Not Available 0
8th Energy Level
Not Available 0
9th Energy Level
Not Available 0
10th Energy Level
Not Available 0
11th Energy Level
Not Available 0
12th Energy Level
Not Available 0
13th Energy Level
Not Available 0
14th Energy Level
Not Available 0
15th Energy Level
Not Available 0
16th Energy Level
Not Available 0
17th Energy Level
Not Available 0
18th Energy Level
Not Available 0
19th Energy Level
Not Available 0
20th Energy Level
Not Available 0
21st Energy Level
Not Available 0
22nd Energy Level
Not Available 0
23rd Energy Level
Not Available 0
24th Energy Level
Not Available 0
25th Energy Level
Not Available 0
26th Energy Level
Not Available 0
27th Energy Level
Not Available 0
28th Energy Level
Not Available 0
29th Energy Level
Not Available 0
30th Energy Level
Not Available 0
Electrochemical Equivalent
8.32 g/amp-hr 1
Electron Work Function
Not Available 0
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility 0
Atomic
0
Atomic Number
87 31
Electron Configuration
[Rn] 7s1 0
Crystal Structure
Body Centered Cubic (BCC) 0
Crystal Lattice
BCC-Crystal-Structure-.jpg#100 0
Atom
0
Number of Protons
87 31
Number of Neutrons
136 17
Number of Electrons
87 31
Radius of an Atom
0
Atomic Radius
Not Available 0
Covalent Radius
260.00 pm 1
Van der Waals Radius
348.00 pm 1
Atomic Weight
223.00 amu 27
Atomic Volume
Not Available 0
Adjacent Atomic Numbers
0
Previous Element
41 0
Next Element
27 0
Valence Electron Potential
8.00 (-eV) 67
Lattice Constant
Not Available 0
Lattice Angles
NA 0
Lattice C/A Ratio
Not Available 0
Mechanical
0
Density
0
Density At Room Temperature
1.87 g/cm3 77
Density When Liquid (at m.p.)
Not Available 0
Tensile Strength
Not Available 0
Viscosity
Not Available 0
Vapor Pressure
0
Vapor Pressure at 1000 K
Not Available 0
Vapor Pressure at 2000 K
Not Available 0
Elasticity properties
0
Shear Modulus
Not Available 0
Bulk Modulus
Not Available 0
Young's Modulus
Not Available 0
Poisson Ratio
Not Available 0
Other Mechanical Properties
NA 0
Magnetic
0
Magnetic Characteristics
0
Specific Gravity
Not Available 0
Magnetic Ordering
Paramagnetic 0
Permeability
Not Available 0
Susceptibility
Not Available 0
Electrical Properties
0
Electrical Property
Poor Conductor 0
Resistivity
3.00 nΩ·m 52
Electrical Conductivity
0.03 106/cm Ω 40
Electron Affinity
Not Available 0
Thermal
0
Specific Heat
Not Available 0
Molar Heat Capacity
Not Available 0
Thermal Conductivity
15.00 W/m·K 54
Critical Temperature
Not Available 0
Thermal Expansion
Not Available 0
Enthalpy
0
Enthalpy of Vaporization
Not Available 0
Enthalpy of Fusion
Not Available 0
Enthalpy of Atomization
71.00 kJ/mol 61
Standard Molar Entropy
Not Available 0
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