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Holmium vs Manganese

Holmium
Manganese
Manganese vs Holmium


Periodic Table
Symbol
Ho   
Mn   
Group Number
Not Available   
7   
11
Period Number
6   
4   
Block
f block   
d block   
Element Family
Lanthanide   
Transition Metal   
CAS Number
7440600   
29
7439965   
99+
Space Group Name
P63/mmc   
I_ 43m   
Space Group Number
194.00   
5
217.00   
4
Facts
Interesting Facts
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
  • Manganese is an essential trace element in all forms of life.
  • Manganese metal oxidizes very easily, but it does not fuse that easily.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Marc Delafontaine   
Johann Gottlieb Gahn   
Discovery
In 1878   
In 1774   
Abundance
  
  
Abundance In Universe
5 * 10-8 %   
27
8 * 10-4 %   
8
Abundance In Sun
~-9999 %   
~0.001 %   
8
Abundance In Meteorites
0.00 %   
99+
0.27 %   
8
Abundance In Earth's Crust
0.00 %   
38
0.11 %   
8
Abundance In Oceans
0.00 %   
99+
0.00 %   
13
Abundance In Humans
Not Available   
0.00 %   
13
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.
  
  • This metal is very brittle hence it mostly not used as a pure metal, but its alloys are very useful
  • Its alloy Manganese steel is extremely strong and used in railway tracks, safes, prison bars and riffle barrels.
  
Industrial Uses
NA   
Automobile 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   
0.08 Blood/mg dm-3   
14
In Bone
Not Available   
100.00 p.p.m.   
8
Physical Properties
Melting Point
1,461.00 °C   
30
1,245.00 °C   
37
Boiling Point
2,600.00 °C   
99+
1,962.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
6.00   
6
Brinell Hardness
746.00 MPa   
13
196.00 MPa   
99+
Vickers Hardness
481.00 MPa   
23
Not Available   
Speed of Sound
2,760.00 m/s   
30
5,150.00 m/s   
7
Optical Properties
  
  
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   
Mn   
Isotopes
  
  
Known Isotopes
34   
5
21   
18
Electronegativity
  
  
Pauling Electronegativity
1.23   
37
1.55   
25
Sanderson Electronegativity
Not Available   
2.20   
7
Allred Rochow Electronegativity
1.10   
30
1.60   
9
Allen Electronegativity
Not Available   
1.75   
15
Electropositivity
  
  
Pauling Electropositivity
2.77   
17
2.45   
29
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
717.30 kJ/mol   
30
2nd Energy Level
1,140.00 kJ/mol   
99+
1,509.00 kJ/mol   
39
3rd Energy Level
2,204.00 kJ/mol   
99+
3,248.00 kJ/mol   
21
4th Energy Level
4,100.00 kJ/mol   
34
4,940.00 kJ/mol   
20
5th Energy Level
Not Available   
6,990.00 kJ/mol   
17
6th Energy Level
Not Available   
9,220.00 kJ/mol   
16
7th Energy level
Not Available   
11,500.00 kJ/mol   
16
8th Energy Level
Not Available   
18,770.00 kJ/mol   
5
9th Energy Level
Not Available   
21,400.00 kJ/mol   
6
10th Energy Level
Not Available   
23,960.00 kJ/mol   
9
11th Energy Level
Not Available   
27,590.00 kJ/mol   
10
12th Energy Level
Not Available   
30,330.00 kJ/mol   
10
13th Energy Level
Not Available   
33,150.00 kJ/mol   
11
14th Energy Level
Not Available   
38,880.00 kJ/mol   
10
15th Energy Level
Not Available   
41,987.00 kJ/mol   
13
16th Energy Level
Not Available   
109,480.00 kJ/mol   
1
17th Energy Level
Not Available   
118,100.00 kJ/mol   
2
18th Energy Level
Not Available   
127,100.00 kJ/mol   
3
19th Energy Level
Not Available   
138,600.00 kJ/mol   
4
20th Energy Level
Not Available   
148,500.00 kJ/mol   
6
21st Energy Level
Not Available   
158,600.00 kJ/mol   
6
22nd Energy Level
Not Available   
172,500.00 kJ/mol   
5
23rd Energy Level
Not Available   
181,380.00 kJ/mol   
5
Electrochemical Equivalent
2.02 g/amp-hr   
29
0.29 g/amp-hr   
99+
Electron Work Function
Not Available   
4.10 eV   
25
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
67   
99+
25   
99+
Electron Configuration
[Xe] 4f11 6s2   
[Ar] 3d5 4s2   
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+
25   
99+
Number of Neutrons
98   
34
30   
99+
Number of Electrons
67   
99+
25   
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm   
18
127.00 pm   
99+
Covalent Radius
192.00 pm   
17
139.00 pm   
99+
Van der Waals Radius
216.00 pm   
24
200.00 pm   
28
Atomic Weight
164.93 amu   
99+
54.94 amu   
99+
Atomic Volume
18.70 cm3/mol   
24
1.39 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Dysprosium
  
Chromium
  
Next Element
Erbium
  
Iron
  
Valence Electron Potential
47.90 (-eV)   
31
220.00 (-eV)   
2
Lattice Constant
357.73 pm   
38
891.25 pm   
1
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+
7.21 g/cm3   
99+
Density When Liquid (at m.p.)
8.34 g/cm3   
26
5.95 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
16
0.00 (Pa)   
12
Elasticity properties
  
  
Shear Modulus
26.30 GPa   
28
Not Available   
Bulk Modulus
40.20 GPa   
32
120.00 GPa   
14
Young's Modulus
64.80 GPa   
31
198.00 GPa   
12
Poisson Ratio
0.23   
29
Not Available   
Other Mechanical Properties
Ductile, Malleable, Sectile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
8.80   
35
7.21   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
814.00 nΩ·m   
4
1.44 nΩ·m   
99+
Electrical Conductivity
0.01 106/cm Ω   
99+
0.01 106/cm Ω   
99+
Electron Affinity
50.00 kJ/mol   
21
0.00 kJ/mol   
40
Thermal Properties
Specific Heat
0.16 J/(kg K)   
35
0.48 J/(kg K)   
11
Molar Heat Capacity
27.15 J/mol·K   
19
26.32 J/mol·K   
29
Thermal Conductivity
16.20 W/m·K   
99+
7.81 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
11.20 µm/(m·K)   
35
21.70 µm/(m·K)   
21
Enthalpy
  
  
Enthalpy of Vaporization
241.00 kJ/mol   
38
219.70 kJ/mol   
99+
Enthalpy of Fusion
11.76 kJ/mol   
29
14.64 kJ/mol   
23
Enthalpy of Atomization
301.00 kJ/mol   
36
280.30 kJ/mol   
38
Standard Molar Entropy
75.30 J/mol.K   
8
32.00 J/mol.K   
99+
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