Symbol
Fr
  
Be
  
Period Number
7
  
2
  
Block
s block
  
s block
  
Element Family
Alkali
  
Alkaline Earth
  
Space Group Name
Not Available
  
P63/mmc
  
Space Group Number
Not Available
  
Interesting Facts
- 223 Francium has the longest half life at 21.8.
- Francium metal is produced by alpha decay in 227Actinium 227.
  
- Beryllium is best anti corrosion metal.
- Beryllium is the lightest metal and still it is stronger than steel.
- It also finds various applications in Nuclear reactors as a reflector.
  
Sources
Formed by Decay Process, Mining
  
Earth's crust, Found in Minerals, Mining, Ores of metals, Ores of Minerals
  
History
  
  
Who Discovered
Marguerite Perey
  
Louis Nicolas Vauquelin
  
Discovery
In 1939
  
In 1797
  
Abundance
  
  
Abundance In Universe
Not Available
  
Abundance In Sun
~-9999 %
  
~0.00000001 %
  
29
Abundance In Meteorites
Not Available
  
Abundance In Earth's Crust
Not Available
  
Abundance In Oceans
Not Available
  
Abundance In Humans
Not Available
  
Uses & Benefits
- Francium has no known uses as it has a half life of only 22 minutes.
  
- Its alloys with copper or nickel are used in manufacturing Gyroscopes, springs, electrical contact and non sparking tools.
- Beryllium Alloys are used as a material for aircraft, missiles, spacecraft and satellite.
  
Industrial Uses
NA
  
Aerospace Industry, Ammunition Industry, Automobile Industry, Electrical Industry, Electronic Industry
  
Medical Uses
NA
  
NA
  
Other Uses
NA
  
Alloys
  
Biological Properties
  
  
Toxicity
NA
  
Toxic
  
Present in Human Body
No
  
Yes
  
In Blood
0.00 Blood/mg dm-3
  
37
0.00 Blood/mg dm-3
  
32
In Bone
0.00 p.p.m.
  
36
0.00 p.p.m.
  
32
Melting Point
1,278.00 °C
  
36
Boiling Point
2,970.00 °C
  
32
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
NA
  
White Gray
  
Luster
NA
  
Metallic
  
Hardness
  
  
Mohs Hardness
Not Available
  
Brinell Hardness
Not Available
  
Vickers Hardness
Not Available
  
1,670.00 MPa
  
4
Speed of Sound
Not Available
  
12,890.00 m/s
  
2
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
Fr
  
Be
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
380.00 kJ/mol
  
99+
899.50 kJ/mol
  
7
2nd Energy Level
Not Available
  
1,757.10 kJ/mol
  
23
3rd Energy Level
Not Available
  
14,848.70 kJ/mol
  
2
4th Energy Level
Not Available
  
21,006.60 kJ/mol
  
2
Electrochemical Equivalent
8.32 g/amp-hr
  
1
0.17 g/amp-hr
  
99+
Electron Work Function
Not Available
  
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
  
Corrosion, Ionization, Radioactive Isotopes
  
Electron Configuration
[Rn] 7s1
  
[He] 2s2
  
Crystal Structure
Body Centered Cubic (BCC)
  
Hexagonal Close Packed (HCP)
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
HCP-Crystal-Structure-of-Beryllium.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Radius
Not Available
  
Atomic Volume
Not Available
  
5.00 cm3/mol
  
99+
Adjacent Atomic Numbers
  
  
Valence Electron Potential
8.00 (-eV)
  
99+
82.00 (-eV)
  
15
Lattice Constant
Not Available
  
Lattice Angles
NA
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Density
  
  
Density At Room Temperature
1.87 g/cm3
  
99+
1.85 g/cm3
  
99+
Density When Liquid (at m.p.)
Not Available
  
1.69 g/cm3
  
99+
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Bulk Modulus
Not Available
  
Young's Modulus
Not Available
  
Poisson Ratio
Not Available
  
Other Mechanical Properties
NA
  
NA
  
Magnetic Characteristics
  
  
Specific Gravity
Not Available
  
Magnetic Ordering
Paramagnetic
  
Diamagnetic
  
Electrical Properties
  
  
Electrical Property
Poor Conductor
  
Semiconductor
  
Resistivity
36.00 nΩ·m
  
99+
Electrical Conductivity
0.03 106/cm Ω
  
40
0.31 106/cm Ω
  
5
Electron Affinity
Not Available
  
0.00 kJ/mol
  
40
Specific Heat
Not Available
  
1.82 J/(kg K)
  
2
Molar Heat Capacity
Not Available
  
16.44 J/mol·K
  
99+
Thermal Conductivity
15.00 W/m·K
  
99+
200.00 W/m·K
  
6
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
Not Available
  
11.30 µm/(m·K)
  
34
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
294.70 kJ/mol
  
30
Enthalpy of Fusion
Not Available
  
11.72 kJ/mol
  
30
Enthalpy of Atomization
71.00 kJ/mol
  
99+
326.40 kJ/mol
  
30
Standard Molar Entropy
Not Available
  
9.50 J/mol.K
  
99+