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Europium vs Francium

Europium
Francium
Francium vs Europium


Periodic Table
Symbol
Eu   
Fr   
Group Number
Not Available   
1   
17
Period Number
6   
7   
Block
f block   
s block   
Element Family
Lanthanide   
Alkali   
CAS Number
7440531   
34
7440735   
18
Space Group Name
Im_ 3m   
Not Available   
Space Group Number
229.00   
1
Not Available   
Facts
Interesting Facts
Not Available   
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
Formed by Decay Process, Mining   
History
  
  
Who Discovered
Eugène-Anatole Demarçay   
Marguerite Perey   
Discovery
In 1896   
In 1939   
Abundance
  
  
Abundance In Universe
5 * 10-8 %   
27
Not Available   
Abundance In Sun
~0.00000005 %   
27
~-9999 %   
Abundance In Meteorites
0.00 %   
99+
Not Available   
Abundance In Earth's Crust
0.00 %   
36
Not Available   
Abundance In Oceans
0.00 %   
99+
Not Available   
Uses
Uses & Benefits
  • Europium metals main uses is in the printing of euro banknotes. These notes glow red under UV light.
  • It is used in low energy light bulbs.
  
  • Francium has no known uses as it has a half life of only 22 minutes.
  
Industrial Uses
Chemical Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys   
NA   
Biological Properties
  
  
Toxicity
Non Toxic   
NA   
Present in Human Body
Yes   
No   
In Blood
Not Available   
0.00 Blood/mg dm-3   
37
In Bone
Not Available   
0.00 p.p.m.   
36
Physical Properties
Melting Point
822.00 °C   
99+
27.00 °C   
99+
Boiling Point
1,597.00 °C   
99+
677.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
NA   
Luster
Lustrous   
NA   
Hardness
  
  
Vickers Hardness
167.00 MPa   
34
Not Available   
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
Eu   
Fr   
Isotopes
  
  
Known Isotopes
31   
8
33   
6
Electronegativity
  
  
Pauling Electronegativity
1.20   
39
0.70   
99+
Sanderson Electronegativity
1.01   
22
Not Available   
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
547.10 kJ/mol   
99+
380.00 kJ/mol   
99+
2nd Energy Level
1,085.00 kJ/mol   
99+
Not Available   
3rd Energy Level
2,404.00 kJ/mol   
99+
Not Available   
4th Energy Level
4,120.00 kJ/mol   
33
Not Available   
Electrochemical Equivalent
1.89 g/amp-hr   
33
8.32 g/amp-hr   
1
Electron Work Function
2.50 eV   
99+
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
63   
99+
87   
31
Electron Configuration
[Xe] 4f7 6s2   
[Rn] 7s1   
Crystal Structure
Body Centered Cubic (BCC)   
Body Centered Cubic (BCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
63   
99+
87   
31
Number of Neutrons
89   
38
136   
17
Number of Electrons
63   
99+
87   
31
Radius of an Atom
  
  
Atomic Radius
180.00 pm   
14
Not Available   
Covalent Radius
198.00 pm   
13
260.00 pm   
1
Van der Waals Radius
233.00 pm   
18
348.00 pm   
1
Atomic Weight
151.96 amu   
99+
223.00 amu   
27
Atomic Volume
28.90 cm3/mol   
8
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Samarium
  
Polonium
  
Next Element
Gadolinium
  
Radium
  
Valence Electron Potential
45.60 (-eV)   
35
8.00 (-eV)   
99+
Lattice Constant
458.10 pm   
17
Not Available   
Lattice Angles
π/2, π/2, π/2   
NA   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
5.26 g/cm3   
99+
1.87 g/cm3   
99+
Density When Liquid (at m.p.)
5.13 g/cm3   
99+
Not Available   
Tensile Strength
120.00 MPa   
15
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
19.40 (Pa)   
4
Not Available   
Elasticity properties
  
  
Shear Modulus
7.90 GPa   
99+
Not Available   
Bulk Modulus
8.30 GPa   
99+
Not Available   
Young's Modulus
18.20 GPa   
99+
Not Available   
Poisson Ratio
0.15   
34
Not Available   
Other Mechanical Properties
Ductile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
5.24   
99+
Not Available   
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Poor Conductor   
Resistivity
0.90 nΩ·m   
99+
3.00 nΩ·m   
99+
Electrical Conductivity
0.01 106/cm Ω   
99+
0.03 106/cm Ω   
40
Electron Affinity
50.00 kJ/mol   
21
Not Available   
Thermal Properties
Specific Heat
0.18 J/(kg K)   
33
Not Available   
Molar Heat Capacity
27.66 J/mol·K   
16
Not Available   
Thermal Conductivity
13.90 W/m·K   
99+
15.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
35.00 µm/(m·K)   
8
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
143.50 kJ/mol   
99+
Not Available   
Enthalpy of Fusion
9.21 kJ/mol   
37
Not Available   
Enthalpy of Atomization
180.00 kJ/mol   
99+
71.00 kJ/mol   
99+
Standard Molar Entropy
77.80 J/mol.K   
4
Not Available   
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