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Ytterbium vs Mendelevium

Ytterbium
Mendelevium
Mendelevium vs Ytterbium


Periodic Table
Symbol
Yb   
Md   
Group Number
Not Available   
Not Available   
Period Number
6   
7   
Block
f block   
f block   
Element Family
Lanthanide   
Actinide   
CAS Number
7440644   
26
7440111   
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.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
Bombarding Einsteinium with Helium Ions   
History
  
  
Who Discovered
Jean Charles Galissard de Marignac   
Lawrence Berkeley National Laboratory   
Discovery
In 1878   
In 1955   
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.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
Automobile Industry, Chemical Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys   
NA   
Biological Properties
  
  
Toxicity
Highly Toxic   
Unknown   
Present in Human Body
No   
No   
In Blood
Not Available   
0.00 Blood/mg dm-3   
37
In Bone
Not Available   
0.00 p.p.m.   
36
Physical Properties
Melting Point
824.00 °C   
99+
827.00 °C   
99+
Boiling Point
1,196.00 °C   
99+
Not Available   
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   
Md   
Isotopes
  
  
Known Isotopes
30   
9
16   
23
Electronegativity
  
  
Pauling Electronegativity
Not Available   
1.30   
32
Allred Rochow Electronegativity
1.06   
33
1.20   
27
Electropositivity
  
  
Pauling Electropositivity
Not Available   
2.70   
22
Ionization Energies
  
  
1st Energy Level
603.40 kJ/mol   
99+
635.00 kJ/mol   
99+
2nd Energy Level
1,174.80 kJ/mol   
99+
1,235.00 kJ/mol   
99+
3rd Energy Level
2,417.00 kJ/mol   
99+
2,470.00 kJ/mol   
99+
4th Energy Level
4,203.00 kJ/mol   
31
3,840.00 kJ/mol   
99+
Electrochemical Equivalent
2.15 g/amp-hr   
25
3.21 g/amp-hr   
12
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
70   
99+
101   
17
Electron Configuration
[Xe] 4f14 6s2   
[Rn] 5f13 7s2   
Crystal Structure
Face Centered Cubic (FCC)   
Not Known   
Crystal Lattice
FCC-Crystal-Structure-of-Ytterbium.jpg#100   
Unknown-Crystal-Structure-of-Mendelevium.jpg#100   
Atom
  
  
Number of Protons
70   
99+
101   
17
Number of Neutrons
103   
31
157   
7
Number of Electrons
70   
99+
101   
17
Radius of an Atom
  
  
Atomic Radius
176.00 pm   
18
Not Available   
Covalent Radius
187.00 pm   
20
Not Available   
Van der Waals Radius
242.00 pm   
12
246.00 pm   
8
Atomic Weight
173.05 amu   
99+
258.00 amu   
14
Atomic Volume
24.79 cm3/mol   
9
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Thulium
  
Fermium
  
Next Element
Lutetium
  
Nobelium
  
Valence Electron Potential
50.30 (-eV)   
27
Not Available   
Lattice Constant
548.47 pm   
11
Not Available   
Lattice Angles
π/2, π/2, π/2   
NA   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
6.90 g/cm3   
99+
Not Available   
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+
Not Available   
Bulk Modulus
30.50 GPa   
39
Not Available   
Young's Modulus
23.90 GPa   
99+
Not Available   
Poisson Ratio
0.21   
33
Not Available   
Other Mechanical Properties
Ductile, Malleable   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
6.97   
99+
Not Available   
Magnetic Ordering
Paramagnetic   
Unknown   
Electrical Properties
  
  
Electrical Property
Conductor   
Unknown   
Resistivity
0.25 nΩ·m   
99+
Not Available   
Electrical Conductivity
0.04 106/cm Ω   
38
Not Available   
Electron Affinity
50.00 kJ/mol   
21
Not Available   
Thermal Properties
Specific Heat
0.15 J/(kg K)   
36
Not Available   
Molar Heat Capacity
26.74 J/mol·K   
25
Not Available   
Thermal Conductivity
38.50 W/m·K   
35
Not Available   
Critical Temperature
26.30 K   
7
Not Available   
Thermal Expansion
26.30 µm/(m·K)   
14
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
128.90 kJ/mol   
99+
Not Available   
Enthalpy of Fusion
7.66 kJ/mol   
99+
Not Available   
Enthalpy of Atomization
180.00 kJ/mol   
99+
Not Available   
Standard Molar Entropy
59.90 J/mol.K   
21
Not Available   
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