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Samarium Francium Comparison


Francium Samarium comparison


Periodic Table

Symbol
Sm   
Fr   

Group Number
Not Available   
1   
17

Period Number
6   
7   

Block
f block   
s block   

Element Family
Lanthanide   
Alkali   

CAS Number
7440199   
99+
7440735   
18

Space Group Name
R_ 3m   
Not Available   

Space Group Number
166.00   
6
Not Available   

Facts

Interesting Facts
  • Samarium metals helps stimulating body metabolism.
  • Samarium metals was 1st observed by Jean Charles Galissard de Marignac in Dydimia in 1853.
  
  • 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
Lecoq de Boisbaudran   
Marguerite Perey   

Discovery
In 1879   
In 1939   

Abundance
  
  

Abundance In Universe
5 * 10-7 %   
19
Not Available   

Abundance In Sun
~0.0000001 %   
26
~-9999 %   

Abundance In Meteorites
0.00 %   
37
Not Available   

Abundance In Earth's Crust
0.00 %   
29
Not Available   

Abundance In Oceans
0.00 %   
40
Not Available   

Uses

Uses & Benefits
  • 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.
  
  • Francium has no known uses as it has a half life of only 22 minutes.
  

Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
NA   

Medical Uses
NA   
NA   

Other Uses
Alloys, In Nuclear Reactors   
NA   

Biological Properties
  
  

Toxicity
Slightly Toxic   
NA   

Present in Human Body
Yes   
No   

In Blood
0.01 Blood/mg dm-3   
22
0.00 Blood/mg dm-3   
37

In Bone
Not Available   
0.00 p.p.m.   
36

Physical Properties

Melting Point
1,072.00 °C   
99+
27.00 °C   
99+

Boiling Point
1,900.00 °C   
99+
677.00 °C   
99+

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silvery White   
NA   

Luster
Lustrous   
NA   

Hardness
  
  

Brinell Hardness
441.00 MPa   
27
Not Available   

Vickers Hardness
412.00 MPa   
24
Not Available   

Speed of Sound
2,130.00 m/s   
99+
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
Sm   
Fr   

Isotopes
  
  

Known Isotopes
30   
9
33   
6

Electronegativity
  
  

Pauling Electronegativity
1.17   
40
0.70   
99+

Allred Rochow Electronegativity
1.07   
32
0.86   
99+

Mulliken-Jaffe Electronegativity
Not Available   
0.68   
25

Allen Electronegativity
Not Available   
0.67   
99+

Electropositivity
  
  

Pauling Electropositivity
2.83   
14
3.30   
1

Ionization Energies
  
  

1st Energy Level
544.50 kJ/mol   
99+
380.00 kJ/mol   
99+

2nd Energy Level
1,070.00 kJ/mol   
99+
Not Available   

3rd Energy Level
2,260.00 kJ/mol   
99+
Not Available   

4th Energy Level
3,990.00 kJ/mol   
37
Not Available   

Electrochemical Equivalent
1.87 g/amp-hr   
34
8.32 g/amp-hr   
1

Electron Work Function
2.70 eV   
99+
Not Available   

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

Atomic Properties

Atomic Number
62   
99+
87   
31

Electron Configuration
[Xe] 4f6 6s2   
[Rn] 7s1   

Crystal Structure
Rhombohedral (RHO)   
Body Centered Cubic (BCC)   

Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100   
BCC-Crystal-Structure-.jpg#100   

Atom
  
  

Number of Protons
62   
99+
87   
31

Number of Neutrons
88   
39
136   
17

Number of Electrons
62   
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
229.00 pm   
20
348.00 pm   
1

Atomic Weight
150.36 amu   
99+
223.00 amu   
27

Atomic Volume
19.95 cm3/mol   
19
Not Available   

Adjacent Atomic Numbers
  
  

Previous Element
Promethium
  
Polonium
  

Next Element
Europium
  
Radium
  

Valence Electron Potential
44.80 (-eV)   
37
8.00 (-eV)   
99+

Lattice Constant
362.10 pm   
33
Not Available   

Lattice Angles
π/2, π/2, 2 π/3   
NA   

Lattice C/A Ratio
Not Available   
Not Available   

Mechanical Properties

Density
  
  

Density At Room Temperature
7.52 g/cm3   
99+
1.87 g/cm3   
99+

Density When Liquid (at m.p.)
7.16 g/cm3   
32
Not Available   

Tensile Strength
Not Available   
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Vapor Pressure at 1000 K
0.94 (Pa)   
9
Not Available   

Elasticity properties
  
  

Shear Modulus
19.50 GPa   
34
Not Available   

Bulk Modulus
37.80 GPa   
35
Not Available   

Young's Modulus
49.70 GPa   
37
Not Available   

Poisson Ratio
0.27   
19
Not Available   

Other Mechanical Properties
NA   
NA   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
7.52   
99+
Not Available   

Magnetic Ordering
Paramagnetic   
Paramagnetic   

Electrical Properties
  
  

Electrical Property
Conductor   
Poor Conductor   

Resistivity
0.94 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
0.20 J/(kg K)   
31
Not Available   

Molar Heat Capacity
29.54 J/mol·K   
7
Not Available   

Thermal Conductivity
13.30 W/m·K   
99+
15.00 W/m·K   
99+

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
12.70 µm/(m·K)   
30
Not Available   

Enthalpy
  
  

Enthalpy of Vaporization
166.40 kJ/mol   
99+
Not Available   

Enthalpy of Fusion
8.62 kJ/mol   
40
Not Available   

Enthalpy of Atomization
209.00 kJ/mol   
99+
71.00 kJ/mol   
99+

Standard Molar Entropy
69.60 J/mol.K   
15
Not Available   

Summary >>
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