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Francium vs Beryllium


Beryllium vs Francium


Periodic Table

Symbol
Fr   
Be   

Group Number
1   
17
2   
16

Period Number
7   
2   

Block
s block   
s block   

Element Family
Alkali   
Alkaline Earth   

CAS Number
7440735   
18
7440417   
99+

Space Group Name
Not Available   
P63/mmc   

Space Group Number
Not Available   
194.00   
5

Facts

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   
1 * 10-7 %   
23

Abundance In Sun
~-9999 %   
~0.00000001 %   
29

Abundance In Meteorites
Not Available   
0.00 %   
99+

Abundance In Earth's Crust
Not Available   
0.00 %   
35

Abundance In Oceans
Not Available   
0.00 %   
39

Abundance In Humans
Not Available   
0.00 %   
19

Uses

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

Physical Properties

Melting Point
27.00 °C   
99+
1,278.00 °C   
36

Boiling Point
677.00 °C   
99+
2,970.00 °C   
32

Appearance
  
  

Physical State
Solid   
Solid   

Color
NA   
White Gray   

Luster
NA   
Metallic   

Hardness
  
  

Mohs Hardness
Not Available   
5.50   
7

Brinell Hardness
Not Available   
590.00 MPa   
21

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 Properties

Chemical Formula
Fr   
Be   

Isotopes
  
  

Known Isotopes
33   
6
9   
29

Electronegativity
  
  

Pauling Electronegativity
0.70   
99+
1.57   
24

Sanderson Electronegativity
Not Available   
1.81   
12

Allred Rochow Electronegativity
0.86   
99+
1.47   
14

Mulliken-Jaffe Electronegativity
0.68   
25
1.54   
12

Allen Electronegativity
0.67   
99+
1.58   
23

Electropositivity
  
  

Pauling Electropositivity
3.30   
1
2.43   
30

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   
4.98 eV   
6

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

Atomic Properties

Atomic Number
87   
31
4   
99+

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
  
  

Number of Protons
87   
31
4   
99+

Number of Neutrons
136   
17
5   
99+

Number of Electrons
87   
31
4   
99+

Radius of an Atom
  
  

Atomic Radius
Not Available   
112.00 pm   
99+

Covalent Radius
260.00 pm   
1
96.00 pm   
99+

Van der Waals Radius
348.00 pm   
1
153.00 pm   
99+

Atomic Weight
223.00 amu   
27
9.01 amu   
99+

Atomic Volume
Not Available   
5.00 cm3/mol   
99+

Adjacent Atomic Numbers
  
  

Previous Element
Polonium
  
Lithium
  

Next Element
Radium
  
Sodium
  

Valence Electron Potential
8.00 (-eV)   
99+
82.00 (-eV)   
15

Lattice Constant
Not Available   
228.58 pm   
99+

Lattice Angles
NA   
π/2, π/2, π/2   

Lattice C/A Ratio
Not Available   
1.57   
18

Mechanical Properties

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   
0.00 (Pa)   
19

Elasticity properties
  
  

Shear Modulus
Not Available   
132.00 GPa   
7

Bulk Modulus
Not Available   
130.00 GPa   
13

Young's Modulus
Not Available   
287.00 GPa   
7

Poisson Ratio
Not Available   
0.03   
35

Other Mechanical Properties
NA   
NA   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
Not Available   
1.85   
99+

Magnetic Ordering
Paramagnetic   
Diamagnetic   

Electrical Properties
  
  

Electrical Property
Poor Conductor   
Semiconductor   

Resistivity
3.00 nΩ·m   
99+
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

Thermal Properties

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+

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