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Cerium vs Mendelevium

Cerium
Mendelevium
Mendelevium vs Cerium


Periodic Table
Symbol
Ce  
Md  
Group Number
3  
15
3  
15
Period Number
6  
7  
Block
f block  
f block  
Element Family
Lanthanide  
Actinide  
CAS Number
7440451  
99+
7440111  
99+
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • 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.
  
  • 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
Martin Heinrich Klaproth, Jöns Jakob Berzelius, Wilhelm Hisinger  
Lawrence Berkeley National Laboratory  
Discovery
In 1803  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
17
0.00 %  
40
Abundance In Sun
0.00 %  
23
-  
Abundance In Meteorites
0.00 %  
27
0.00 %  
99+
Abundance In Earth's Crust
0.01 %  
18
-  
Abundance In Oceans
0.00 %  
33
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • 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.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
Chemical Industry  
-  
Medical Uses
Medical Research  
-  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Moderately Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
30
0.00 Blood/mg dm-3  
40
In Bone
2.70 p.p.m.  
14
0.00 p.p.m.  
99+
Physical
Melting Point
795.00 °C  
99+
827.00 °C  
99+
Boiling Point
3,257.00 °C  
24
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
-  
Luster
Lustrous  
Metallic  
Hardness
  
  
Mohs Hardness
2.50  
15
-  
Brinell Hardness
186.00 MPa  
99+
350.00 MPa  
36
Vickers Hardness
210.00 MPa  
99+
0.00 MPa  
99+
Speed of Sound
2,100.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.20  
9
1.30  
99+
Reflectivity
68.00 %  
15
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ce  
Md  
Isotopes
  
  
Known Isotopes
30  
9
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.12  
99+
1.30  
33
Sanderson Electronegativity
1.12  
37
1.30  
25
Allred Rochow Electronegativity
1.08  
32
1.20  
28
Mulliken-Jaffe Electronegativity
1.12  
99+
1.30  
33
Allen Electronegativity
1.12  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.88  
11
2.70  
22
Ionization Energies
  
  
1st Energy Level
534.40 kJ/mol  
99+
635.00 kJ/mol  
99+
2nd Energy Level
1,050.00 kJ/mol  
99+
1,235.00 kJ/mol  
99+
3rd Energy Level
1,949.00 kJ/mol  
99+
2,470.00 kJ/mol  
99+
4th Energy Level
3,547.00 kJ/mol  
99+
3,840.00 kJ/mol  
99+
5th Energy Level
6,325.00 kJ/mol  
37
6,350.00 kJ/mol  
36
6th Energy Level
7,490.00 kJ/mol  
38
6,350.00 kJ/mol  
99+
7th Energy level
5,340.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
8th Energy Level
5,340.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
9th Energy Level
5,340.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
10th Energy Level
5,340.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
11th Energy Level
5,340.00 kJ/mol  
99+
6,400.00 kJ/mol  
99+
12th Energy Level
5,340.00 kJ/mol  
99+
60,100.00 kJ/mol  
16
13th Energy Level
5,650.00 kJ/mol  
99+
6,350.00 kJ/mol  
37
14th Energy Level
5,340.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
15th Energy Level
53,400.00 kJ/mol  
99+
63,500.00 kJ/mol  
37
16th Energy Level
53,400.00 kJ/mol  
99+
635.00 kJ/mol  
99+
17th Energy Level
534.40 kJ/mol  
99+
1,107.00 kJ/mol  
21
18th Energy Level
5,340.00 kJ/mol  
99+
6,350.00 kJ/mol  
39
19th Energy Level
534.40 kJ/mol  
99+
635.00 kJ/mol  
99+
20th Energy Level
534.00 kJ/mol  
99+
635.00 kJ/mol  
40
21st Energy Level
5,346.00 kJ/mol  
24
6,350.00 kJ/mol  
13
22nd Energy Level
594.00 kJ/mol  
99+
635.00 kJ/mol  
34
23rd Energy Level
5,346.00 kJ/mol  
26
6,350.00 kJ/mol  
13
24th Energy Level
565.50 kJ/mol  
99+
635.00 kJ/mol  
36
25th Energy Level
534.40 kJ/mol  
99+
635.00 kJ/mol  
38
26th Energy Level
565.50 kJ/mol  
99+
635.00 kJ/mol  
37
27th Energy Level
565.50 kJ/mol  
99+
635.00 kJ/mol  
39
28th Energy Level
565.50 kJ/mol  
99+
635.00 kJ/mol  
99+
29th Energy Level
565.50 kJ/mol  
99+
635.00 kJ/mol  
99+
30th Energy Level
594.00 kJ/mol  
99+
635.00 kJ/mol  
40
Electrochemical Equivalent
1.74 g/amp-hr  
99+
3.21 g/amp-hr  
13
Electron Work Function
2.84 eV  
99+
3.89 eV  
37
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
58  
99+
101  
17
Electron Configuration
[Xe] 4f1 5d1 6s2  
[Rn] 5f13 7s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Not Known  
Crystal Lattice
DHCP-Crystal-Structure-of-Cerium.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
58  
99+
101  
17
Number of Neutrons
82  
99+
157  
8
Number of Electrons
58  
99+
101  
17
Radius of an Atom
  
  
Atomic Radius
181.80 pm  
14
175.00 pm  
21
Covalent Radius
204.00 pm  
8
175.00 pm  
25
Van der Waals Radius
235.00 pm  
21
246.00 pm  
12
Atomic Weight
140.12 amu  
99+
258.00 amu  
14
Atomic Volume
20.67 cm3/mol  
27
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Lanthanum
  
Fermium
  
Next Element
Praseodymium
  
Nobelium
  
Valence Electron Potential
41.78 (-eV)  
99+
63.70 (-eV)  
23
Lattice Constant
362.00 pm  
38
-  
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.59  
31
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
6.77 g/cm3  
99+
10.30 g/cm3  
38
Density When Liquid (at m.p.)
6.55 g/cm3  
99+
10.30 g/cm3  
39
Tensile Strength
270.00 MPa  
17
80.00 MPa  
29
Viscosity
0.00  
23
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
36
0.00 (Pa)  
37
Vapor Pressure at 2000 K
1.04 (Pa)  
13
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
13.50 GPa  
99+
32.00 GPa  
24
Bulk Modulus
21.50 GPa  
99+
0.00 GPa  
99+
Young's Modulus
33.60 GPa  
99+
12.00 GPa  
99+
Poisson Ratio
0.24  
27
0.30  
14
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
6.77  
99+
13.50  
29
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
7
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
828.00 nΩ·m  
3
0.63 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
50.00 kJ/mol  
26
Thermal
Specific Heat
0.19 J/(kg K)  
33
0.10 J/(kg K)  
99+
Molar Heat Capacity
26.94 J/mol·K  
30
27.00 J/mol·K  
29
Thermal Conductivity
11.30 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
1,071.00 K  
99+
1,100.00 K  
99+
Thermal Expansion
6.30 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
414.00 kJ/mol  
22
380.50 kJ/mol  
26
Enthalpy of Fusion
5.46 kJ/mol  
99+
-  
Enthalpy of Atomization
381.00 kJ/mol  
31
410.80 kJ/mol  
25
Standard Molar Entropy
72.00 J/mol.K  
12
37.40 J/mol.K  
99+
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