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Properties of Polonium and Samarium

Polonium
Samarium
Properties of Samarium & Polonium


Physical Properties
Melting Point
254.00 °C   
99+
1,072.00 °C   
99+
Boiling Point
962.00 °C   
99+
1,900.00 °C   
99+
Hardness
  
  
Mohs Hardness
Not Available   
Not Available   
Brinell Hardness
Not Available   
441.00 MPa   
27
Vickers Hardness
Not Available   
412.00 MPa   
24
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
Not Available   
2,130.00 m/s   
99+
Allotropes
Yes   
No   
α Allotropes
?
simple cubic (metallic)Α-Polonium   
Not Available   
β Allotropes
?
rhombohedral (metallic)Β-Polonium   
Not Available   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
Po   
Sm   
Isotopes
  
  
Known Isotopes
29   
10
30   
9
Electronegativity
  
  
Pauling Electronegativity
2.00   
7
1.17   
40
Sanderson Electronegativity
Not Available   
Not Available   
Allred Rochow Electronegativity
1.76   
2
1.07   
32
Mulliken-Jaffe Electronegativity
2.48   
1
Not Available   
Allen Electronegativity
2.19   
2
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.00   
99+
2.83   
14
Ionization Energies
  
  
1st Energy Level
812.10 kJ/mol   
14
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+
Electrochemical Equivalent
3.90 g/amp-hr   
8
1.87 g/amp-hr   
34
Electron Work Function
Not Available   
2.70 eV   
99+
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, 
?
Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.Solubility   
?
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   
Mechanical Properties
Density
  
  
Density At Room Temperature
9.20 g/cm3   
99+
7.52 g/cm3   
99+
Density When Liquid (at m.p.)
9.40 g/cm3   
19
7.16 g/cm3   
32
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.94 (Pa)   
9
Vapor Pressure at 2000 K
Not Available   
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
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   
Periodic Table
Symbol
Po   
Sm   
Group Number
16   
2
Not Available   
Period Number
6   
6   
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   
?
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   
Element Family
?
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   
?
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   
Atomic Properties
Atomic Number
84   
32
62   
99+
Atomic Weight
209.00 amu   
28
150.36 amu   
99+
Atomic Volume
22.23 cm3/mol   
13
19.95 cm3/mol   
19
Electron Configuration
[Xe] 4f14 5d10 6s2 6p4   
[Xe] 4f6 6s2   
Valence Electron Potential
Not Available   
44.80 (-eV)   
37
Atom
  
  
Number of Protons
84   
32
62   
99+
Number of Neutrons
125   
19
88   
39
Number of Electrons
84   
32
62   
99+
Crystal Structure
?
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)   
?
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)   
Crystal Lattice
MON-Crystal-Structure-of-Polonium.jpg#100   
RHO-Crystal-Structure-of-Samarium.jpg#100   
Radius of an Atom
  
  
Atomic Radius
168.00 pm   
23
180.00 pm   
14
Covalent Radius
140.00 pm   
99+
198.00 pm   
13
Van der Waals Radius
197.00 pm   
29
229.00 pm   
20
Lattice Constant
335.90 pm   
99+
362.10 pm   
33
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Next Element
Francium
  
Europium
  
Previous Element
Bismuth
  
Promethium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
0.40 nΩ·m   
99+
0.94 nΩ·m   
99+
Electrical Conductivity
0.02 106/cm Ω   
99+
0.01 106/cm Ω   
99+
Electron Affinity
183.30 kJ/mol   
3
50.00 kJ/mol   
21
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
9.32   
31
7.52   
99+
Magnetic Ordering
?
Nonmagnetic metals are non magnetic in nature and do not show or exhibit any magnetic properties.Nonmagnetic   
?
Paramagnetic metals are slightly attracted by magnet, but they can’t retain the magnetic effect once they are removed from the magnetic field.Paramagnetic   
Permeability
Not Available   
Not Available   
Susceptibility
Not Available   
Not Available   
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.20 J/(kg K)   
31
Thermal Conductivity
20.00 W/m·K   
99+
13.30 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
26.40 J/mol·K   
28
29.54 J/mol·K   
7
Thermal Expansion
23.50 µm/(m·K)   
16
12.70 µm/(m·K)   
30
Standard Molar Entropy
Not Available   
69.60 J/mol.K   
15
Enthalpy
  
  
Enthalpy of Vaporization
60.30 kJ/mol   
99+
166.40 kJ/mol   
99+
Enthalpy of Fusion
13.00 kJ/mol   
26
8.62 kJ/mol   
40
Enthalpy of Atomization
134.00 kJ/mol   
99+
209.00 kJ/mol   
99+
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