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Francium vs Samarium

Francium
Samarium
Samarium vs Francium


Periodic Table
Symbol
Fr   
Sm   
Group Number
1   
17
Not Available   
Period Number
7   
6   
Block
s block   
f block   
Element Family
Alkali   
Lanthanide   
CAS Number
7440735   
18
7440199   
99+
Space Group Name
Not Available   
R_ 3m   
Space Group Number
Not Available   
166.00   
6
Facts
Interesting Facts
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
  
Sources
Formed by Decay Process, Mining   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Marguerite Perey   
Lecoq de Boisbaudran   
Discovery
In 1939   
In 1879   
Abundance
  
  
Abundance In Universe
Not Available   
5 * 10-7 %   
19
Abundance In Sun
~-9999 %   
~0.0000001 %   
26
Abundance In Meteorites
Not Available   
0.00 %   
37
Abundance In Earth's Crust
Not Available   
0.00 %   
29
Abundance In Oceans
Not Available   
0.00 %   
40
Uses
Uses & Benefits
  • Francium has no known uses as it has a half life of only 22 minutes.
  
  • Magnets of Samarium cobalt alloy are stronger than that of Iron and hence, they are used in microwave application.
  • Samarium metal also used in optical lasers and infrared absorbing glasses and as a neutron absorber.
  
Industrial Uses
NA   
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys, In Nuclear Reactors   
Biological Properties
  
  
Toxicity
NA   
Slightly Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
0.01 Blood/mg dm-3   
22
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
27.00 °C   
99+
1,072.00 °C   
99+
Boiling Point
677.00 °C   
99+
1,900.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
NA   
Silvery White   
Luster
NA   
Lustrous   
Hardness
  
  
Brinell Hardness
Not Available   
441.00 MPa   
27
Vickers Hardness
Not Available   
412.00 MPa   
24
Speed of Sound
Not Available   
2,130.00 m/s   
99+
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   
Sm   
Isotopes
  
  
Known Isotopes
33   
6
30   
9
Electronegativity
  
  
Pauling Electronegativity
0.70   
99+
1.17   
40
Allred Rochow Electronegativity
0.86   
99+
1.07   
32
Mulliken-Jaffe Electronegativity
0.68   
25
Not Available   
Allen Electronegativity
0.67   
99+
Not Available   
Electropositivity
  
  
Pauling Electropositivity
3.30   
1
2.83   
14
Ionization Energies
  
  
1st Energy Level
380.00 kJ/mol   
99+
544.50 kJ/mol   
99+
2nd Energy Level
Not Available   
1,070.00 kJ/mol   
99+
3rd Energy Level
Not Available   
2,260.00 kJ/mol   
99+
4th Energy Level
Not Available   
3,990.00 kJ/mol   
37
Electrochemical Equivalent
8.32 g/amp-hr   
1
1.87 g/amp-hr   
34
Electron Work Function
Not Available   
2.70 eV   
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
87   
31
62   
99+
Electron Configuration
[Rn] 7s1   
[Xe] 4f6 6s2   
Crystal Structure
Body Centered Cubic (BCC)   
Rhombohedral (RHO)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
RHO-Crystal-Structure-of-Samarium.jpg#100   
Atom
  
  
Number of Protons
87   
31
62   
99+
Number of Neutrons
136   
17
88   
39
Number of Electrons
87   
31
62   
99+
Radius of an Atom
  
  
Atomic Radius
Not Available   
180.00 pm   
14
Covalent Radius
260.00 pm   
1
198.00 pm   
13
Van der Waals Radius
348.00 pm   
1
229.00 pm   
20
Atomic Weight
223.00 amu   
27
150.36 amu   
99+
Atomic Volume
Not Available   
19.95 cm3/mol   
19
Adjacent Atomic Numbers
  
  
Previous Element
Polonium
  
Promethium
  
Next Element
Radium
  
Europium
  
Valence Electron Potential
8.00 (-eV)   
99+
44.80 (-eV)   
37
Lattice Constant
Not Available   
362.10 pm   
33
Lattice Angles
NA   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
1.87 g/cm3   
99+
7.52 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
7.16 g/cm3   
32
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.94 (Pa)   
9
Elasticity properties
  
  
Shear Modulus
Not Available   
19.50 GPa   
34
Bulk Modulus
Not Available   
37.80 GPa   
35
Young's Modulus
Not Available   
49.70 GPa   
37
Poisson Ratio
Not Available   
0.27   
19
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
7.52   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Poor Conductor   
Conductor   
Resistivity
3.00 nΩ·m   
99+
0.94 nΩ·m   
99+
Electrical Conductivity
0.03 106/cm Ω   
40
0.01 106/cm Ω   
99+
Electron Affinity
Not Available   
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
Not Available   
0.20 J/(kg K)   
31
Molar Heat Capacity
Not Available   
29.54 J/mol·K   
7
Thermal Conductivity
15.00 W/m·K   
99+
13.30 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
12.70 µm/(m·K)   
30
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
166.40 kJ/mol   
99+
Enthalpy of Fusion
Not Available   
8.62 kJ/mol   
40
Enthalpy of Atomization
71.00 kJ/mol   
99+
209.00 kJ/mol   
99+
Standard Molar Entropy
Not Available   
69.60 J/mol.K   
15
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