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Erbium vs Molybdenum

Erbium
Molybdenum
Molybdenum vs Erbium


Periodic Table
Symbol
Er  
Mo  
Group Number
3  
15
6  
12
Period Number
6  
5  
Block
f block  
d block  
Element Family
Lanthanide  
Transition Metal  
CAS Number
7440520  
35
7439987  
99+
Space Group Name
P63/mmc  
Im_ 3m  
Space Group Number
194.00  
7
229.00  
2
Facts
Interesting Facts
  • Erbium metal is used as alloyed with Vanadium to make it softer.
  • Recent studies shows that it is helpful for metabolism.
  
  • Molybdenum is highly reactive metal, hence not found free in nature .
  • Till 18th century Molybdenum element were often mistaken as a carbon or Lead.
  
Sources
Mining  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Carl Gustaf Mosander  
Carl Wilhelm Scheele  
Discovery
In 1842  
In 1778  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
20
Abundance In Sun
0.00 %  
26
0.00 %  
19
Abundance In Meteorites
0.00 %  
36
0.00 %  
24
Abundance In Earth's Crust
0.00 %  
32
0.00 %  
39
Abundance In Oceans
0.00 %  
36
0.00 %  
9
Abundance In Humans
0.00 %  
24
0.00 %  
17
Uses
Uses & Benefits
  • 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.
  
  • Its alloys are used to make engine parts, drills, saw blade, etc.
  • Lubricant additive made up of Molybdenum disulfide is commonly used in the industry. It is also used as a catalyst.
  
Industrial Uses
Chemical Industry  
Aerospace Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Mildly Toxic  
Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
31
In Bone
0.00 p.p.m.  
99+
0.70 p.p.m.  
20
Physical
Melting Point
1,522.00 °C  
28
2,617.00 °C  
5
Boiling Point
2,510.00 °C  
99+
4,612.00 °C  
9
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Gray  
Luster
Lustrous  
Metallic  
Hardness
  
  
Mohs Hardness
1.00  
22
5.50  
7
Brinell Hardness
814.00 MPa  
12
1,370.00 MPa  
7
Vickers Hardness
589.00 MPa  
30
1,400.00 MPa  
11
Speed of Sound
2,830.00 m/s  
99+
5,400.00 m/s  
9
Optical Properties
  
  
Refractive Index
1.76  
24
2.00  
15
Reflectivity
36.00 %  
33
58.00 %  
25
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Er  
Mo  
Isotopes
  
  
Known Isotopes
31  
8
25  
14
Electronegativity
  
  
Pauling Electronegativity
1.24  
37
2.16  
6
Sanderson Electronegativity
1.24  
29
1.15  
34
Allred Rochow Electronegativity
1.11  
30
1.30  
25
Mulliken-Jaffe Electronegativity
1.24  
36
2.16  
7
Allen Electronegativity
1.24  
99+
2.16  
3
Electropositivity
  
  
Pauling Electropositivity
2.76  
18
1.84  
99+
Ionization Energies
  
  
1st Energy Level
589.30 kJ/mol  
99+
684.30 kJ/mol  
37
2nd Energy Level
1,150.00 kJ/mol  
99+
1,560.00 kJ/mol  
38
3rd Energy Level
2,194.00 kJ/mol  
99+
2,618.00 kJ/mol  
99+
4th Energy Level
4,120.00 kJ/mol  
99+
4,480.00 kJ/mol  
36
5th Energy Level
5,897.00 kJ/mol  
99+
5,257.00 kJ/mol  
99+
6th Energy Level
5,897.00 kJ/mol  
99+
6,640.80 kJ/mol  
99+
7th Energy level
5,890.00 kJ/mol  
99+
12,125.00 kJ/mol  
13
8th Energy Level
5,890.00 kJ/mol  
99+
13,860.00 kJ/mol  
16
9th Energy Level
4,240.00 kJ/mol  
99+
15,835.00 kJ/mol  
16
10th Energy Level
5,890.00 kJ/mol  
99+
17,980.00 kJ/mol  
18
11th Energy Level
5,890.00 kJ/mol  
99+
20,190.00 kJ/mol  
17
12th Energy Level
5,890.00 kJ/mol  
99+
22,219.00 kJ/mol  
38
13th Energy Level
5,890.00 kJ/mol  
99+
26,930.00 kJ/mol  
13
14th Energy Level
5,890.00 kJ/mol  
37
29,196.00 kJ/mol  
13
15th Energy Level
58,900.00 kJ/mol  
99+
52,490.00 kJ/mol  
99+
16th Energy Level
58,900.00 kJ/mol  
38
55,000.00 kJ/mol  
99+
17th Energy Level
589.30 kJ/mol  
99+
61,400.00 kJ/mol  
9
18th Energy Level
5,890.00 kJ/mol  
99+
67,700.00 kJ/mol  
9
19th Energy Level
589.30 kJ/mol  
99+
74,000.00 kJ/mol  
9
20th Energy Level
589.00 kJ/mol  
99+
80,400.00 kJ/mol  
10
21st Energy Level
5,897.00 kJ/mol  
19
87,000.00 kJ/mol  
9
22nd Energy Level
589.00 kJ/mol  
99+
93,400.00 kJ/mol  
7
23rd Energy Level
589.30 kJ/mol  
99+
98,420.00 kJ/mol  
6
24th Energy Level
589.30 kJ/mol  
99+
104,400.00 kJ/mol  
2
25th Energy Level
589.00 kJ/mol  
99+
121,900.00 kJ/mol  
1
26th Energy Level
589.30 kJ/mol  
99+
127,700.00 kJ/mol  
1
27th Energy Level
589.30 kJ/mol  
99+
133,800.00 kJ/mol  
1
28th Energy Level
589.30 kJ/mol  
99+
139,800.00 kJ/mol  
1
29th Energy Level
589.30 kJ/mol  
99+
148,100.00 kJ/mol  
1
30th Energy Level
589.70 kJ/mol  
99+
154,500.00 kJ/mol  
1
Electrochemical Equivalent
2.08 g/amp-hr  
32
0.89 g/amp-hr  
99+
Electron Work Function
5.93 eV  
2
4.60 eV  
17
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
68  
99+
42  
99+
Electron Configuration
[Xe] 4f12 6s2  
[Kr] 4d5 5s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Body Centered Cubic (BCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Erbium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
68  
99+
42  
99+
Number of Neutrons
99  
34
54  
99+
Number of Electrons
68  
99+
42  
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm  
20
139.00 pm  
99+
Covalent Radius
189.00 pm  
19
154.00 pm  
34
Van der Waals Radius
0.00 pm  
99+
200.00 pm  
35
Atomic Weight
167.26 amu  
99+
95.95 amu  
99+
Atomic Volume
18.40 cm3/mol  
37
9.40 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Holmium
  
Niobium
  
Next Element
Thulium
  
Technetium
  
Valence Electron Potential
49.00 (-eV)  
30
88.60 (-eV)  
13
Lattice Constant
355.88 pm  
99+
314.70 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.57  
40
1.03  
99+
Mechanical
Density
  
  
Density At Room Temperature
9.07 g/cm3  
99+
10.28 g/cm3  
39
Density When Liquid (at m.p.)
8.86 g/cm3  
99+
9.33 g/cm3  
99+
Tensile Strength
350.00 MPa  
12
324.00 MPa  
15
Viscosity
0.00  
25
0.00  
5
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
21
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
27
Elasticity properties
  
  
Shear Modulus
28.30 GPa  
31
126.00 GPa  
8
Bulk Modulus
44.40 GPa  
31
230.00 GPa  
6
Young's Modulus
69.90 GPa  
31
329.00 GPa  
6
Poisson Ratio
0.24  
28
0.31  
13
Other Mechanical Properties
Malleable  
Ductile, Weldable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.07  
99+
10.22  
40
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
9
Susceptibility
0.00  
11
0.00  
29
Electrical Properties
  
  
Electrical Property
Conductor  
Semiconductor  
Resistivity
0.86 nΩ·m  
99+
53.40 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.19 106/cm Ω  
11
Electron Affinity
50.00 kJ/mol  
26
71.90 kJ/mol  
16
Thermal
Specific Heat
0.17 J/(kg K)  
35
0.25 J/(kg K)  
21
Molar Heat Capacity
28.12 J/mol·K  
14
24.06 J/mol·K  
99+
Thermal Conductivity
14.50 W/m·K  
99+
138.00 W/m·K  
12
Critical Temperature
1,802.00 K  
30
2,896.00 K  
6
Thermal Expansion
12.20 µm/(m·K)  
99+
4.80 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
261.00 kJ/mol  
99+
594.10 kJ/mol  
9
Enthalpy of Fusion
17.20 kJ/mol  
15
27.61 kJ/mol  
5
Enthalpy of Atomization
314.00 kJ/mol  
99+
653.00 kJ/mol  
7
Standard Molar Entropy
73.10 J/mol.K  
11
28.70 J/mol.K  
99+
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