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Mendelevium vs Erbium

Mendelevium
Erbium
Erbium vs Mendelevium


Periodic Table
Symbol
Md  
Er  
Group Number
3  
15
3  
15
Period Number
7  
6  
Block
f block  
f block  
Element Family
Actinide  
Lanthanide  
CAS Number
7440111  
99+
7440520  
35
Space Group Name
-  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
  • Erbium metal is used as alloyed with Vanadium to make it softer.
  • Recent studies shows that it is helpful for metabolism.
  
Sources
Bombarding Einsteinium with Helium Ions  
Mining  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
Carl Gustaf Mosander  
Discovery
In 1955  
In 1842  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
23
Abundance In Sun
-  
0.00 %  
26
Abundance In Meteorites
0.00 %  
99+
0.00 %  
36
Abundance In Earth's Crust
-  
0.00 %  
32
Abundance In Oceans
-  
0.00 %  
36
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
  • It has a tendency to get tarnished in the open air, but when alloyed with elements like erbium, vanadium, its hardness levels decreases.
  • Its compounds like Erbium oxide is used in safety glasses of welders and metal workers.
  
Industrial Uses
-  
Chemical Industry  
Medical Uses
-  
-  
Other Uses
-  
Alloys  
Biological Properties
  
  
Toxicity
-  
Mildly Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
827.00 °C  
99+
1,522.00 °C  
28
Boiling Point
0.00 °C  
99+
2,510.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
Silvery White  
Luster
Metallic  
Lustrous  
Hardness
  
  
Mohs Hardness
-  
1.00  
22
Brinell Hardness
350.00 MPa  
36
814.00 MPa  
12
Vickers Hardness
0.00 MPa  
99+
589.00 MPa  
30
Speed of Sound
2,680.00 m/s  
99+
2,830.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.76  
24
Reflectivity
66.00 %  
17
36.00 %  
33
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Md  
Er  
Isotopes
  
  
Known Isotopes
16  
23
31  
8
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.24  
37
Sanderson Electronegativity
1.30  
25
1.24  
29
Allred Rochow Electronegativity
1.20  
28
1.11  
30
Mulliken-Jaffe Electronegativity
1.30  
33
1.24  
36
Allen Electronegativity
1.30  
40
1.24  
99+
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.76  
18
Ionization Energies
  
  
1st Energy Level
635.00 kJ/mol  
99+
589.30 kJ/mol  
99+
2nd Energy Level
1,235.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
3rd Energy Level
2,470.00 kJ/mol  
99+
2,194.00 kJ/mol  
99+
4th Energy Level
3,840.00 kJ/mol  
99+
4,120.00 kJ/mol  
99+
5th Energy Level
6,350.00 kJ/mol  
36
5,897.00 kJ/mol  
99+
6th Energy Level
6,350.00 kJ/mol  
99+
5,897.00 kJ/mol  
99+
7th Energy level
6,350.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
8th Energy Level
6,350.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
9th Energy Level
6,350.00 kJ/mol  
99+
4,240.00 kJ/mol  
99+
10th Energy Level
6,350.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
11th Energy Level
6,400.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
12th Energy Level
60,100.00 kJ/mol  
16
5,890.00 kJ/mol  
99+
13th Energy Level
6,350.00 kJ/mol  
37
5,890.00 kJ/mol  
99+
14th Energy Level
1,150.00 kJ/mol  
99+
5,890.00 kJ/mol  
37
15th Energy Level
63,500.00 kJ/mol  
37
58,900.00 kJ/mol  
99+
16th Energy Level
635.00 kJ/mol  
99+
58,900.00 kJ/mol  
38
17th Energy Level
1,107.00 kJ/mol  
21
589.30 kJ/mol  
99+
18th Energy Level
6,350.00 kJ/mol  
39
5,890.00 kJ/mol  
99+
19th Energy Level
635.00 kJ/mol  
99+
589.30 kJ/mol  
99+
20th Energy Level
635.00 kJ/mol  
40
589.00 kJ/mol  
99+
21st Energy Level
6,350.00 kJ/mol  
13
5,897.00 kJ/mol  
19
22nd Energy Level
635.00 kJ/mol  
34
589.00 kJ/mol  
99+
23rd Energy Level
6,350.00 kJ/mol  
13
589.30 kJ/mol  
99+
24th Energy Level
635.00 kJ/mol  
36
589.30 kJ/mol  
99+
25th Energy Level
635.00 kJ/mol  
38
589.00 kJ/mol  
99+
26th Energy Level
635.00 kJ/mol  
37
589.30 kJ/mol  
99+
27th Energy Level
635.00 kJ/mol  
39
589.30 kJ/mol  
99+
28th Energy Level
635.00 kJ/mol  
99+
589.30 kJ/mol  
99+
29th Energy Level
635.00 kJ/mol  
99+
589.30 kJ/mol  
99+
30th Energy Level
635.00 kJ/mol  
40
589.70 kJ/mol  
99+
Electrochemical Equivalent
3.21 g/amp-hr  
13
2.08 g/amp-hr  
32
Electron Work Function
3.89 eV  
37
5.93 eV  
2
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
101  
17
68  
99+
Electron Configuration
[Rn] 5f13 7s2  
[Xe] 4f12 6s2  
Crystal Structure
Not Known  
Hexagonal Close Packed (HCP)  
Crystal Lattice
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
HCP-Crystal-Structure-of-Erbium.jpg#100  
Atom
  
  
Number of Protons
101  
17
68  
99+
Number of Neutrons
157  
8
99  
34
Number of Electrons
101  
17
68  
99+
Radius of an Atom
  
  
Atomic Radius
175.00 pm  
21
176.00 pm  
20
Covalent Radius
175.00 pm  
25
189.00 pm  
19
Van der Waals Radius
246.00 pm  
12
0.00 pm  
99+
Atomic Weight
258.00 amu  
14
167.26 amu  
99+
Atomic Volume
19.90 cm3/mol  
32
18.40 cm3/mol  
37
Adjacent Atomic Numbers
  
  
Previous Element
Fermium
  
Holmium
  
Next Element
Nobelium
  
Thulium
  
Valence Electron Potential
63.70 (-eV)  
23
49.00 (-eV)  
30
Lattice Constant
-  
355.88 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.58  
36
1.57  
40
Mechanical
Density
  
  
Density At Room Temperature
10.30 g/cm3  
38
9.07 g/cm3  
99+
Density When Liquid (at m.p.)
10.30 g/cm3  
39
8.86 g/cm3  
99+
Tensile Strength
80.00 MPa  
29
350.00 MPa  
12
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
21
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
32.00 GPa  
24
28.30 GPa  
31
Bulk Modulus
0.00 GPa  
99+
44.40 GPa  
31
Young's Modulus
12.00 GPa  
99+
69.90 GPa  
31
Poisson Ratio
0.30  
14
0.24  
28
Other Mechanical Properties
-  
Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.50  
29
9.07  
99+
Magnetic Ordering
-  
Paramagnetic  
Permeability
0.00 H/m  
11
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
11
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
0.63 nΩ·m  
99+
0.86 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.01 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
50.00 kJ/mol  
26
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.17 J/(kg K)  
35
Molar Heat Capacity
27.00 J/mol·K  
29
28.12 J/mol·K  
14
Thermal Conductivity
0.00 W/m·K  
99+
14.50 W/m·K  
99+
Critical Temperature
1,100.00 K  
99+
1,802.00 K  
30
Thermal Expansion
11.60 µm/(m·K)  
99+
12.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
380.50 kJ/mol  
26
261.00 kJ/mol  
99+
Enthalpy of Fusion
-  
17.20 kJ/mol  
15
Enthalpy of Atomization
410.80 kJ/mol  
25
314.00 kJ/mol  
99+
Standard Molar Entropy
37.40 J/mol.K  
99+
73.10 J/mol.K  
11
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