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Lanthanum vs Mendelevium

Lanthanum
Mendelevium
Mendelevium vs Lanthanum


Periodic Table
Symbol
La  
Md  
Group Number
3  
15
3  
15
Period Number
6  
7  
Block
f block  
f block  
Element Family
Lanthanide  
Actinide  
CAS Number
7439910  
99+
7440111  
99+
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
  
  • 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
Carl Gustaf Mosander  
Lawrence Berkeley National Laboratory  
Discovery
In 1838  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
40
Abundance In Sun
0.00 %  
25
-  
Abundance In Meteorites
0.00 %  
32
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
19
-  
Abundance In Oceans
0.00 %  
29
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • It has no commercial uses, but its alloys are in high demand. Lanthanum and Nickel alloy is used for the hydrogen gas storage.
  • The best-known use for mischmetal alloy of Lanthanum is; as a ‘flints’ for cigarette lighters.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys, Mirror Manufacturing  
-  
Biological Properties
  
  
Toxicity
Low Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
32
0.00 Blood/mg dm-3  
40
In Bone
0.08 p.p.m.  
29
0.00 p.p.m.  
99+
Physical
Melting Point
920.00 °C  
99+
827.00 °C  
99+
Boiling Point
3,469.00 °C  
19
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
-  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
2.50  
15
-  
Brinell Hardness
350.00 MPa  
36
350.00 MPa  
36
Vickers Hardness
360.00 MPa  
99+
0.00 MPa  
99+
Speed of Sound
2,475.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.80  
22
1.30  
99+
Reflectivity
70.00 %  
13
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
La  
Md  
Isotopes
  
  
Known Isotopes
31  
8
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
1.30  
33
Sanderson Electronegativity
1.10  
38
1.30  
25
Allred Rochow Electronegativity
1.08  
32
1.20  
28
Mulliken-Jaffe Electronegativity
1.10  
99+
1.30  
33
Allen Electronegativity
1.10  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.90  
10
2.70  
22
Ionization Energies
  
  
1st Energy Level
538.10 kJ/mol  
99+
635.00 kJ/mol  
99+
2nd Energy Level
1,067.00 kJ/mol  
99+
1,235.00 kJ/mol  
99+
3rd Energy Level
1,850.30 kJ/mol  
99+
2,470.00 kJ/mol  
99+
4th Energy Level
4,819.00 kJ/mol  
32
3,840.00 kJ/mol  
99+
5th Energy Level
5,940.00 kJ/mol  
99+
6,350.00 kJ/mol  
36
6th Energy Level
5,380.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
7th Energy level
5,380.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
8th Energy Level
5,380.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
9th Energy Level
5,380.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
10th Energy Level
5,380.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
11th Energy Level
5,380.00 kJ/mol  
99+
6,400.00 kJ/mol  
99+
12th Energy Level
5,380.00 kJ/mol  
99+
60,100.00 kJ/mol  
16
13th Energy Level
5,380.00 kJ/mol  
99+
6,350.00 kJ/mol  
37
14th Energy Level
5,380.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
15th Energy Level
53,800.00 kJ/mol  
99+
63,500.00 kJ/mol  
37
16th Energy Level
53,800.00 kJ/mol  
99+
635.00 kJ/mol  
99+
17th Energy Level
538.10 kJ/mol  
99+
1,107.00 kJ/mol  
21
18th Energy Level
5,380.00 kJ/mol  
99+
6,350.00 kJ/mol  
39
19th Energy Level
538.10 kJ/mol  
99+
635.00 kJ/mol  
99+
20th Energy Level
538.00 kJ/mol  
99+
635.00 kJ/mol  
40
21st Energy Level
538.10 kJ/mol  
99+
6,350.00 kJ/mol  
13
22nd Energy Level
538.00 kJ/mol  
99+
635.00 kJ/mol  
34
23rd Energy Level
5,380.00 kJ/mol  
25
6,350.00 kJ/mol  
13
24th Energy Level
538.00 kJ/mol  
99+
635.00 kJ/mol  
36
25th Energy Level
538.00 kJ/mol  
99+
635.00 kJ/mol  
38
26th Energy Level
538.00 kJ/mol  
99+
635.00 kJ/mol  
37
27th Energy Level
538.10 kJ/mol  
99+
635.00 kJ/mol  
39
28th Energy Level
538.00 kJ/mol  
99+
635.00 kJ/mol  
99+
29th Energy Level
538.10 kJ/mol  
99+
635.00 kJ/mol  
99+
30th Energy Level
538.00 kJ/mol  
99+
635.00 kJ/mol  
40
Electrochemical Equivalent
1.73 g/amp-hr  
99+
3.21 g/amp-hr  
13
Electron Work Function
3.50 eV  
99+
3.89 eV  
37
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
57  
99+
101  
17
Electron Configuration
[Xe] 5d2 6s2  
[Rn] 5f13 7s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Not Known  
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
57  
99+
101  
17
Number of Neutrons
82  
99+
157  
8
Number of Electrons
57  
99+
101  
17
Radius of an Atom
  
  
Atomic Radius
187.00 pm  
10
175.00 pm  
21
Covalent Radius
207.00 pm  
6
175.00 pm  
25
Van der Waals Radius
240.00 pm  
17
246.00 pm  
12
Atomic Weight
138.91 amu  
99+
258.00 amu  
14
Atomic Volume
20.73 cm3/mol  
26
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Barium
  
Fermium
  
Next Element
Cerium
  
Nobelium
  
Valence Electron Potential
40.71 (-eV)  
99+
63.70 (-eV)  
23
Lattice Constant
377.20 pm  
31
-  
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.62  
16
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
6.16 g/cm3  
99+
10.30 g/cm3  
38
Density When Liquid (at m.p.)
5.94 g/cm3  
99+
10.30 g/cm3  
39
Tensile Strength
45.00 MPa  
40
80.00 MPa  
29
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.98 (Pa)  
15
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
14.30 GPa  
99+
32.00 GPa  
24
Bulk Modulus
27.90 GPa  
99+
0.00 GPa  
99+
Young's Modulus
36.60 GPa  
99+
12.00 GPa  
99+
Poisson Ratio
0.28  
17
0.30  
14
Other Mechanical Properties
Ductile  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
6.17  
99+
13.50  
29
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
15
0.00 H/m  
11
Susceptibility
0.00  
25
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
615.00 nΩ·m  
7
0.63 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
48.00 kJ/mol  
28
50.00 kJ/mol  
26
Thermal
Specific Heat
0.19 J/(kg K)  
33
0.10 J/(kg K)  
99+
Molar Heat Capacity
27.11 J/mol·K  
27
27.00 J/mol·K  
29
Thermal Conductivity
13.40 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
1,193.00 K  
99+
1,100.00 K  
99+
Thermal Expansion
12.10 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
399.60 kJ/mol  
24
380.50 kJ/mol  
26
Enthalpy of Fusion
6.20 kJ/mol  
99+
-  
Enthalpy of Atomization
431.00 kJ/mol  
21
410.80 kJ/mol  
25
Standard Molar Entropy
56.90 J/mol.K  
31
37.40 J/mol.K  
99+
Periodic Table >>
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