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Properties of Samarium and Polonium

Samarium
Polonium
Properties of Polonium & Samarium


Physical Properties
Melting Point
1,072.00 °C   
99+
254.00 °C   
99+
Boiling Point
1,900.00 °C   
99+
962.00 °C   
99+
Hardness
  
  
Mohs Hardness
Not Available   
Not Available   
Brinell Hardness
441.00 MPa   
27
Not Available   
Vickers Hardness
412.00 MPa   
24
Not Available   
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
2,130.00 m/s   
99+
Not Available   
Allotropes
No   
Yes   
α Allotropes
Not Available   
?
simple cubic (metallic)Α-Polonium   
β Allotropes
Not Available   
?
rhombohedral (metallic)Β-Polonium   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
Sm   
Po   
Isotopes
  
  
Known Isotopes
30   
9
29   
10
Electronegativity
  
  
Pauling Electronegativity
1.17   
40
2.00   
7
Sanderson Electronegativity
Not Available   
Not Available   
Allred Rochow Electronegativity
1.07   
32
1.76   
2
Mulliken-Jaffe Electronegativity
Not Available   
2.48   
1
Allen Electronegativity
Not Available   
2.19   
2
Electropositivity
  
  
Pauling Electropositivity
2.83   
14
2.00   
99+
Ionization Energies
  
  
1st Energy Level
544.50 kJ/mol   
99+
812.10 kJ/mol   
14
2nd Energy Level
1,070.00 kJ/mol   
99+
Not Available   
3rd Energy Level
2,260.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.87 g/amp-hr   
34
3.90 g/amp-hr   
8
Electron Work Function
2.70 eV   
99+
Not Available   
Other Chemical Properties
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes   
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes, 
?
Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.Solubility   
Mechanical Properties
Density
  
  
Density At Room Temperature
7.52 g/cm3   
99+
9.20 g/cm3   
99+
Density When Liquid (at m.p.)
7.16 g/cm3   
32
9.40 g/cm3   
19
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.94 (Pa)   
9
Not Available   
Vapor Pressure at 2000 K
Not Available   
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
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   
Periodic Table
Symbol
Sm   
Po   
Group Number
Not Available   
16   
2
Period Number
6   
6   
Block
?
The f-block is in the center-left of a 32-column periodic table but in the footnoted appendage of 18-column tables. These elements are not generally considered as part of any group. They are often called inner transition metals.f block   
?
The p-block is on the right side of the periodic table and includes elements from the six columns beginning with column 13 and ending with column 18. Helium, though being in the top of group 18, is not included in the p-block.p block   
Element Family
?
Total 15 metals are included in Lanthanide series from Lanthanum to Lutetium. Lanthanide series is located under f and d block of the periodic table.Lanthanide   
?
All post transition metals are placed in group number 13, 14 and 15 of periodic table. In fact, they are located between Transition Metals and Metalloids. Post transition metals have very poor mechanical properties.Post-​Transition   
Atomic Properties
Atomic Number
62   
99+
84   
32
Atomic Weight
150.36 amu   
99+
209.00 amu   
28
Atomic Volume
19.95 cm3/mol   
19
22.23 cm3/mol   
13
Electron Configuration
[Xe] 4f6 6s2   
[Xe] 4f14 5d10 6s2 6p4   
Valence Electron Potential
44.80 (-eV)   
37
Not Available   
Atom
  
  
Number of Protons
62   
99+
84   
32
Number of Neutrons
88   
39
125   
19
Number of Electrons
62   
99+
84   
32
Crystal Structure
?
Rhombohedral crystal lattice structure comes under trigonal crystal structure. The Rhombohedral crystal structure is a term associated trigonal crystal structure with the rhombohedral lattice.Rhombohedral (RHO)   
?
The mono-clinic crystal structure is one of the seven lattice point groups. Here vectors of crystal have unequal lengths. Here vectors of crystal have unequal lengths and have two vectors perpendicular to the 3rd oneMonoclinic (MON)   
Crystal Lattice
RHO-Crystal-Structure-of-Samarium.jpg#100   
MON-Crystal-Structure-of-Polonium.jpg#100   
Radius of an Atom
  
  
Atomic Radius
180.00 pm   
14
168.00 pm   
23
Covalent Radius
198.00 pm   
13
140.00 pm   
99+
Van der Waals Radius
229.00 pm   
20
197.00 pm   
29
Lattice Constant
362.10 pm   
33
335.90 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Next Element
Europium
  
Francium
  
Previous Element
Promethium
  
Bismuth
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
0.94 nΩ·m   
99+
0.40 nΩ·m   
99+
Electrical Conductivity
0.01 106/cm Ω   
99+
0.02 106/cm Ω   
99+
Electron Affinity
50.00 kJ/mol   
21
183.30 kJ/mol   
3
Electrical Property
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
?
Conductor metals have very low resistance to electric currents. They can easily conduct electric current through them.Conductor   
Magnetic Characteristics
  
  
Specific Gravity
7.52   
99+
9.32   
31
Magnetic Ordering
?
Paramagnetic metals are slightly attracted by magnet, but they can’t retain the magnetic effect once they are removed from the magnetic field.Paramagnetic   
?
Nonmagnetic metals are non magnetic in nature and do not show or exhibit any magnetic properties.Nonmagnetic   
Permeability
Not Available   
Not Available   
Susceptibility
Not Available   
Not Available   
Thermal Properties
Specific Heat
0.20 J/(kg K)   
31
0.12 J/(kg K)   
40
Thermal Conductivity
13.30 W/m·K   
99+
20.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
29.54 J/mol·K   
7
26.40 J/mol·K   
28
Thermal Expansion
12.70 µm/(m·K)   
30
23.50 µm/(m·K)   
16
Standard Molar Entropy
69.60 J/mol.K   
15
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
166.40 kJ/mol   
99+
60.30 kJ/mol   
99+
Enthalpy of Fusion
8.62 kJ/mol   
40
13.00 kJ/mol   
26
Enthalpy of Atomization
209.00 kJ/mol   
99+
134.00 kJ/mol   
99+
All >>
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