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Mendelevium vs Cerium

Mendelevium
Cerium
Cerium vs Mendelevium


Periodic Table
Symbol
Md   
Ce   
Group Number
Not Available   
Not Available   
Period Number
7   
6   
Block
f block   
f block   
Element Family
Actinide   
Lanthanide   
CAS Number
7440111   
99+
7440451   
99+
Space Group Name
Not Available   
P63/mmc   
Space Group Number
Not Available   
194.00   
5
Facts
Interesting Facts
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
  • Cerium is a rare earth metal but still it is not rare at all.
  • It’s non-toxic compound Cerium sulfide has a rich red color and it is used as a pigment.
  • Cerium metal is also used in Flat screen TVs, light bulb, floodlights, etc.
  
Sources
Bombarding Einsteinium with Helium Ions   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory   
Martin Heinrich Klaproth, Jöns Jakob Berzelius, Wilhelm Hisinger   
Discovery
In 1955   
In 1803   
Abundance
  
  
Abundance In Universe
Not Available   
1 * 10-6 %   
16
Abundance In Sun
~-9999 %   
~0.0000004 %   
23
Abundance In Meteorites
Not Available   
0.00 %   
27
Abundance In Earth's Crust
Not Available   
0.01 %   
18
Abundance In Oceans
Not Available   
0.00 %   
33
Uses
Uses & Benefits
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
  • It is used to include flints for cigarette lighters.
  • Its compound Cerium (Ill) Oxide is used as a catalyst; it is put inside the walls of the oven as it prevents from the buildup of cooking residues.
  
Industrial Uses
NA   
Chemical Industry   
Medical Uses
NA   
Medical Research   
Other Uses
NA   
Alloys   
Biological Properties
  
  
Toxicity
Unknown   
Moderately Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
30
In Bone
0.00 p.p.m.   
36
2.70 p.p.m.   
14
Physical Properties
Melting Point
827.00 °C   
99+
795.00 °C   
99+
Boiling Point
Not Available   
3,257.00 °C   
23
Appearance
  
  
Physical State
Solid   
Solid   
Color
Unknown   
Silvery White   
Luster
Metallic   
Lustrous   
Hardness
  
  
Mohs Hardness
Not Available   
2.50   
14
Brinell Hardness
Not Available   
186.00 MPa   
99+
Vickers Hardness
Not Available   
210.00 MPa   
32
Speed of Sound
Not Available   
2,100.00 m/s   
99+
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
Md   
Ce   
Isotopes
  
  
Known Isotopes
16   
23
30   
9
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
1.12   
99+
Allred Rochow Electronegativity
1.20   
27
1.08   
31
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.88   
11
Ionization Energies
  
  
1st Energy Level
635.00 kJ/mol   
99+
534.40 kJ/mol   
99+
2nd Energy Level
1,235.00 kJ/mol   
99+
1,050.00 kJ/mol   
99+
3rd Energy Level
2,470.00 kJ/mol   
99+
1,949.00 kJ/mol   
99+
4th Energy Level
3,840.00 kJ/mol   
99+
3,547.00 kJ/mol   
99+
5th Energy Level
Not Available   
6,325.00 kJ/mol   
22
6th Energy Level
Not Available   
7,490.00 kJ/mol   
21
Electrochemical Equivalent
3.21 g/amp-hr   
12
1.74 g/amp-hr   
99+
Electron Work Function
Not Available   
2.84 eV   
39
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
101   
17
58   
99+
Electron Configuration
[Rn] 5f13 7s2   
[Xe] 4f1 5d1 6s2   
Crystal Structure
Not Known   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
Unknown-Crystal-Structure-of-Mendelevium.jpg#100   
DHCP-Crystal-Structure-of-Cerium.jpg#100   
Atom
  
  
Number of Protons
101   
17
58   
99+
Number of Neutrons
157   
7
82   
99+
Number of Electrons
101   
17
58   
99+
Radius of an Atom
  
  
Atomic Radius
Not Available   
181.80 pm   
12
Covalent Radius
Not Available   
204.00 pm   
8
Van der Waals Radius
246.00 pm   
8
235.00 pm   
17
Atomic Weight
258.00 amu   
14
140.12 amu   
99+
Atomic Volume
Not Available   
20.67 cm3/mol   
17
Adjacent Atomic Numbers
  
  
Previous Element
Fermium
  
Lanthanum
  
Next Element
Nobelium
  
Praseodymium
  
Valence Electron Potential
Not Available   
41.78 (-eV)   
99+
Lattice Constant
Not Available   
362.00 pm   
34
Lattice Angles
NA   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
Not Available   
6.77 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
6.55 g/cm3   
38
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
34
Vapor Pressure at 2000 K
Not Available   
1.04 (Pa)   
13
Elasticity properties
  
  
Shear Modulus
Not Available   
13.50 GPa   
99+
Bulk Modulus
Not Available   
21.50 GPa   
99+
Young's Modulus
Not Available   
33.60 GPa   
99+
Poisson Ratio
Not Available   
0.24   
27
Other Mechanical Properties
Unknown   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
6.77   
99+
Magnetic Ordering
Unknown   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Unknown   
Conductor   
Resistivity
Not Available   
828.00 nΩ·m   
3
Electrical Conductivity
Not Available   
0.01 106/cm Ω   
99+
Electron Affinity
Not Available   
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
Not Available   
0.19 J/(kg K)   
32
Molar Heat Capacity
Not Available   
26.94 J/mol·K   
23
Thermal Conductivity
Not Available   
11.30 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
6.30 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
414.00 kJ/mol   
16
Enthalpy of Fusion
Not Available   
5.46 kJ/mol   
99+
Enthalpy of Atomization
Not Available   
381.00 kJ/mol   
23
Standard Molar Entropy
Not Available   
72.00 J/mol.K   
12
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