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Ytterbium vs Promethium

Ytterbium
Promethium
Promethium vs Ytterbium


Periodic Table
Symbol
Yb   
Pm   
Group Number
Not Available   
Not Available   
Period Number
6   
6   
Block
f block   
f block   
Element Family
Lanthanide   
Lanthanide   
CAS Number
7440644   
26
7440122   
99+
Space Group Name
Fm_ 3m   
Not Available   
Space Group Number
225.00   
2
Not Available   
Facts
Interesting Facts
  • Ytterbium metal oxidizes rapidly if exposed to air.
  • Ytterbium metal can dissolve quickly in Mineral acid.
  
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining   
History
  
  
Who Discovered
Jean Charles Galissard de Marignac   
Chien Shiung Wu, Emilio Segrè, Hans Bethe   
Discovery
In 1878   
In 1942   
Abundance
  
  
Abundance In Universe
2 * 10-7 %   
22
Not Available   
Abundance In Sun
~0.0000001 %   
26
~-9999 %   
Abundance In Meteorites
0.00 %   
36
Not Available   
Abundance In Earth's Crust
0.00 %   
33
Not Available   
Abundance In Oceans
0.00 %   
37
Not Available   
Uses
Uses & Benefits
  • Ytterbium metal is used in memory devices and tuneable laser.
  • It is also used as industrial catalyst as the other catalysts are too toxic and polluting.
  
  • It is used for research purpose. Very small amount of this metal is used in atomic batteries.
  • Its radioactive decay is used for a phosphor to give off light. The light emitted is converted into electricity.
  
Industrial Uses
Automobile Industry, Chemical Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys   
NA   
Biological Properties
  
  
Toxicity
Highly Toxic   
Non Toxic   
Present in Human Body
No   
No   
In Blood
Not Available   
0.00 Blood/mg dm-3   
37
Physical Properties
Melting Point
824.00 °C   
99+
1,042.00 °C   
99+
Boiling Point
1,196.00 °C   
99+
3,000.00 °C   
31
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Unknown   
Luster
Metallic   
Metallic   
Hardness
  
  
Brinell Hardness
343.00 MPa   
31
Not Available   
Vickers Hardness
206.00 MPa   
33
Not Available   
Speed of Sound
1,590.00 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
Yb   
Pm   
Isotopes
  
  
Known Isotopes
30   
9
27   
12
Electronegativity
  
  
Allred Rochow Electronegativity
1.06   
33
1.07   
32
Electropositivity
  
  
Ionization Energies
  
  
1st Energy Level
603.40 kJ/mol   
99+
540.00 kJ/mol   
99+
2nd Energy Level
1,174.80 kJ/mol   
99+
1,050.00 kJ/mol   
99+
3rd Energy Level
2,417.00 kJ/mol   
99+
2,150.00 kJ/mol   
99+
4th Energy Level
4,203.00 kJ/mol   
31
3,970.00 kJ/mol   
38
Electrochemical Equivalent
2.15 g/amp-hr   
25
1.80 g/amp-hr   
36
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
70   
99+
61   
99+
Electron Configuration
[Xe] 4f14 6s2   
[Xe] 4f5 6s2   
Crystal Structure
Face Centered Cubic (FCC)   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
FCC-Crystal-Structure-of-Ytterbium.jpg#100   
DHCP-Crystal-Structure-of-Promethium.jpg#100   
Atom
  
  
Number of Protons
70   
99+
61   
99+
Number of Neutrons
103   
31
84   
40
Number of Electrons
70   
99+
61   
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm   
18
183.00 pm   
10
Covalent Radius
187.00 pm   
20
199.00 pm   
12
Van der Waals Radius
242.00 pm   
12
236.00 pm   
16
Atomic Weight
173.05 amu   
99+
145.00 amu   
99+
Atomic Volume
24.79 cm3/mol   
9
22.39 cm3/mol   
12
Adjacent Atomic Numbers
  
  
Previous Element
Thulium
  
Neodymium
  
Next Element
Lutetium
  
Samarium
  
Valence Electron Potential
50.30 (-eV)   
27
44.10 (-eV)   
39
Lattice Constant
548.47 pm   
11
Not Available   
Lattice Angles
π/2, π/2, π/2   
Unknown   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
6.90 g/cm3   
99+
7.26 g/cm3   
99+
Density When Liquid (at m.p.)
6.21 g/cm3   
99+
Not Available   
Tensile Strength
58.00 MPa   
18
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Shear Modulus
9.90 GPa   
99+
18.00 GPa   
36
Bulk Modulus
30.50 GPa   
39
33.00 GPa   
36
Young's Modulus
23.90 GPa   
99+
46.00 GPa   
38
Poisson Ratio
0.21   
33
0.28   
17
Other Mechanical Properties
Ductile, Malleable   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
6.97   
99+
7.26   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
0.25 nΩ·m   
99+
0.75 nΩ·m   
99+
Electrical Conductivity
0.04 106/cm Ω   
38
Not Available   
Electron Affinity
50.00 kJ/mol   
21
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
0.15 J/(kg K)   
36
0.18 J/(kg K)   
33
Molar Heat Capacity
26.74 J/mol·K   
25
Not Available   
Thermal Conductivity
38.50 W/m·K   
35
17.90 W/m·K   
99+
Critical Temperature
26.30 K   
7
Not Available   
Thermal Expansion
26.30 µm/(m·K)   
14
9.00 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
128.90 kJ/mol   
99+
Not Available   
Enthalpy of Fusion
7.66 kJ/mol   
99+
7.50 kJ/mol   
99+
Enthalpy of Atomization
180.00 kJ/mol   
99+
310.00 kJ/mol   
34
Standard Molar Entropy
59.90 J/mol.K   
21
Not Available   
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