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Holmium vs Molybdenum

Holmium
Molybdenum
Molybdenum vs Holmium


Periodic Table
Symbol
Ho   
Mo   
Group Number
Not Available   
6   
12
Period Number
6   
5   
Block
f block   
d block   
Element Family
Lanthanide   
Transition Metal   
CAS Number
7440600   
29
7439987   
99+
Space Group Name
P63/mmc   
Im_ 3m   
Space Group Number
194.00   
5
229.00   
1
Facts
Interesting Facts
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
  • 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
Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Marc Delafontaine   
Carl Wilhelm Scheele   
Discovery
In 1878   
In 1778   
Abundance
  
  
Abundance In Universe
5 * 10-8 %   
27
5 * 10-7 %   
19
Abundance In Sun
~-9999 %   
~0.0000009 %   
19
Abundance In Meteorites
0.00 %   
99+
0.00 %   
24
Abundance In Earth's Crust
0.00 %   
38
0.00 %   
39
Abundance In Oceans
0.00 %   
99+
0.00 %   
9
Abundance In Humans
Not Available   
0.00 %   
14
Uses
Uses & Benefits
  • Holmium metal has an ability to absorb neutrons, so this metal is used in nuclear reactors to keep the chain reactions of elements under control.
  • Alloys of Holmium are used to produce Magnet.
  
  • 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
NA   
Aerospace Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research   
Alloys   
Biological Properties
  
  
Toxicity
Low Toxic   
Toxic   
Present in Human Body
No   
Yes   
In Blood
Not Available   
0.00 Blood/mg dm-3   
31
In Bone
Not Available   
0.70 p.p.m.   
18
Physical Properties
Melting Point
1,461.00 °C   
30
2,617.00 °C   
5
Boiling Point
2,600.00 °C   
99+
4,612.00 °C   
9
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Gray   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
5.50   
7
Brinell Hardness
746.00 MPa   
13
1,370.00 MPa   
7
Vickers Hardness
481.00 MPa   
23
1,400.00 MPa   
6
Speed of Sound
2,760.00 m/s   
30
5,400.00 m/s   
6
Optical Properties
  
  
Reflectivity
Not Available   
58.00 %   
15
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
Ho   
Mo   
Isotopes
  
  
Known Isotopes
34   
5
25   
14
Electronegativity
  
  
Pauling Electronegativity
1.23   
37
2.16   
5
Sanderson Electronegativity
Not Available   
1.15   
19
Allred Rochow Electronegativity
1.10   
30
1.30   
24
Allen Electronegativity
Not Available   
2.16   
3
Electropositivity
  
  
Pauling Electropositivity
2.77   
17
1.84   
99+
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
684.30 kJ/mol   
37
2nd Energy Level
1,140.00 kJ/mol   
99+
1,560.00 kJ/mol   
37
3rd Energy Level
2,204.00 kJ/mol   
99+
2,618.00 kJ/mol   
99+
4th Energy Level
4,100.00 kJ/mol   
34
4,480.00 kJ/mol   
26
5th Energy Level
Not Available   
5,257.00 kJ/mol   
32
6th Energy Level
Not Available   
6,640.80 kJ/mol   
22
7th Energy level
Not Available   
12,125.00 kJ/mol   
13
8th Energy Level
Not Available   
13,860.00 kJ/mol   
16
9th Energy Level
Not Available   
15,835.00 kJ/mol   
16
10th Energy Level
Not Available   
17,980.00 kJ/mol   
18
11th Energy Level
Not Available   
20,190.00 kJ/mol   
17
12th Energy Level
Not Available   
22,219.00 kJ/mol   
15
13th Energy Level
Not Available   
26,930.00 kJ/mol   
13
14th Energy Level
Not Available   
29,196.00 kJ/mol   
13
15th Energy Level
Not Available   
52,490.00 kJ/mol   
7
16th Energy Level
Not Available   
55,000.00 kJ/mol   
8
17th Energy Level
Not Available   
61,400.00 kJ/mol   
9
18th Energy Level
Not Available   
67,700.00 kJ/mol   
9
19th Energy Level
Not Available   
74,000.00 kJ/mol   
9
20th Energy Level
Not Available   
80,400.00 kJ/mol   
10
21st Energy Level
Not Available   
87,000.00 kJ/mol   
9
22nd Energy Level
Not Available   
93,400.00 kJ/mol   
7
23rd Energy Level
Not Available   
98,420.00 kJ/mol   
6
24th Energy Level
Not Available   
104,400.00 kJ/mol   
2
25th Energy Level
Not Available   
121,900.00 kJ/mol   
1
26th Energy Level
Not Available   
127,700.00 kJ/mol   
1
27th Energy Level
Not Available   
133,800.00 kJ/mol   
1
28th Energy Level
Not Available   
139,800.00 kJ/mol   
1
29th Energy Level
Not Available   
148,100.00 kJ/mol   
1
30th Energy Level
Not Available   
154,500.00 kJ/mol   
1
Electrochemical Equivalent
2.02 g/amp-hr   
29
0.89 g/amp-hr   
99+
Electron Work Function
Not Available   
4.60 eV   
12
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
67   
99+
42   
99+
Electron Configuration
[Xe] 4f11 6s2   
[Kr] 4d5 5s1   
Crystal Structure
Hexagonal Close Packed (HCP)   
Body Centered Cubic (BCC)   
Crystal Lattice
HCP-Crystal-Structure-of-Holmium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
67   
99+
42   
99+
Number of Neutrons
98   
34
54   
99+
Number of Electrons
67   
99+
42   
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm   
18
139.00 pm   
39
Covalent Radius
192.00 pm   
17
154.00 pm   
32
Van der Waals Radius
216.00 pm   
24
200.00 pm   
28
Atomic Weight
164.93 amu   
99+
95.95 amu   
99+
Atomic Volume
18.70 cm3/mol   
24
9.40 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Dysprosium
  
Niobium
  
Next Element
Erbium
  
Technetium
  
Valence Electron Potential
47.90 (-eV)   
31
88.60 (-eV)   
13
Lattice Constant
357.73 pm   
38
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   
17
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
8.79 g/cm3   
99+
10.28 g/cm3   
36
Density When Liquid (at m.p.)
8.34 g/cm3   
26
9.33 g/cm3   
20
Tensile Strength
Not Available   
324.00 MPa   
13
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
16
Not Available   
Vapor Pressure at 2000 K
Not Available   
0.00 (Pa)   
26
Elasticity properties
  
  
Shear Modulus
26.30 GPa   
28
126.00 GPa   
8
Bulk Modulus
40.20 GPa   
32
230.00 GPa   
6
Young's Modulus
64.80 GPa   
31
329.00 GPa   
6
Poisson Ratio
0.23   
29
0.31   
13
Other Mechanical Properties
Ductile, Malleable, Sectile   
Ductile, Weldable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
8.80   
35
10.22   
27
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Semiconductor   
Resistivity
814.00 nΩ·m   
4
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   
21
71.90 kJ/mol   
14
Thermal Properties
Specific Heat
0.16 J/(kg K)   
35
0.25 J/(kg K)   
21
Molar Heat Capacity
27.15 J/mol·K   
19
24.06 J/mol·K   
99+
Thermal Conductivity
16.20 W/m·K   
99+
138.00 W/m·K   
12
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
11.20 µm/(m·K)   
35
4.80 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
241.00 kJ/mol   
38
594.10 kJ/mol   
8
Enthalpy of Fusion
11.76 kJ/mol   
29
27.61 kJ/mol   
5
Enthalpy of Atomization
301.00 kJ/mol   
36
653.00 kJ/mol   
7
Standard Molar Entropy
75.30 J/mol.K   
8
28.70 J/mol.K   
99+
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