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Ho Element
Holmium


Periodic Table
0
Symbol
Ho 0
Group Number
Not Available 0
Period Number
6 2
Block
f block 0
Element Family
Lanthanide 0
CAS Number
7440600 29
Space Group Name
P63/mmc 0
Space Group Number
194.00 5
Facts
0
Interesting Facts
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
0
Sources
Found in Minerals, Mining, Ores of Minerals 0
History
0
Who Discovered
Marc Delafontaine 0
Discovery
In 1878 0
Abundance
0
Abundance In Universe
5 * 10-8 % 27
Abundance In Sun
~-9999 % 0
Abundance In Meteorites
0.00 % 43
Abundance In Earth's Crust
0.00 % 38
Abundance In Oceans
0.00 % 41
Abundance In Humans
Not Available 0
Uses
0
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.
0
Industrial Uses
NA 0
Medical Uses
NA 0
Other Uses
Alloys, Nuclear Research 0
Biological Properties
0
Toxicity
Low Toxic 0
Present in Human Body
No 0
In Blood
Not Available 0
In Bone
Not Available 0
Physical
0
Melting Point
1,461.00 °C 30
Boiling Point
2,600.00 °C 42
Appearance
0
Physical State
Solid 0
Color
Silvery White 0
Luster
Metallic 0
Hardness
0
Mohs Hardness
Not Available 0
Brinell Hardness
746.00 MPa 13
Vickers Hardness
481.00 MPa 23
Speed of Sound
2,760.00 m/s 30
Optical Properties
0
Refractive Index
Not Available 0
Reflectivity
Not Available 0
Allotropes
No 0
α Allotropes
Not Available 0
β Allotropes
Not Available 0
γ Allotropes
Not Available 0
Chemical
0
Chemical Formula
Ho 0
Isotopes
0
Known Isotopes
34 5
Electronegativity
0
Pauling Electronegativity
1.23 37
Sanderson Electronegativity
Not Available 0
Allred Rochow Electronegativity
1.10 30
Mulliken-Jaffe Electronegativity
Not Available 0
Allen Electronegativity
Not Available 0
Electropositivity
0
Pauling Electropositivity
2.77 17
Ionization Energies
0
1st Energy Level
581.00 kJ/mol 62
2nd Energy Level
1,140.00 kJ/mol 70
3rd Energy Level
2,204.00 kJ/mol 63
4th Energy Level
4,100.00 kJ/mol 34
5th Energy Level
Not Available 0
6th Energy Level
Not Available 0
7th Energy level
Not Available 0
8th Energy Level
Not Available 0
9th Energy Level
Not Available 0
10th Energy Level
Not Available 0
11th Energy Level
Not Available 0
12th Energy Level
Not Available 0
13th Energy Level
Not Available 0
14th Energy Level
Not Available 0
15th Energy Level
Not Available 0
16th Energy Level
Not Available 0
17th Energy Level
Not Available 0
18th Energy Level
Not Available 0
19th Energy Level
Not Available 0
20th Energy Level
Not Available 0
21st Energy Level
Not Available 0
22nd Energy Level
Not Available 0
23rd Energy Level
Not Available 0
24th Energy Level
Not Available 0
25th Energy Level
Not Available 0
26th Energy Level
Not Available 0
27th Energy Level
Not Available 0
28th Energy Level
Not Available 0
29th Energy Level
Not Available 0
30th Energy Level
Not Available 0
Electrochemical Equivalent
2.02 g/amp-hr 29
Electron Work Function
Not Available 0
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility 0
Atomic
0
Atomic Number
67 49
Electron Configuration
[Xe] 4f11 6s2 0
Crystal Structure
Hexagonal Close Packed (HCP) 0
Crystal Lattice
HCP-Crystal-Structure-of-Holmium.jpg#100 0
Atom
0
Number of Protons
67 48
Number of Neutrons
98 34
Number of Electrons
67 48
Radius of an Atom
0
Atomic Radius
176.00 pm 18
Covalent Radius
192.00 pm 17
Van der Waals Radius
216.00 pm 24
Atomic Weight
164.93 amu 44
Atomic Volume
18.70 cm3/mol 24
Adjacent Atomic Numbers
0
Previous Element
78 0
Next Element
48 0
Valence Electron Potential
47.90 (-eV) 31
Lattice Constant
357.73 pm 38
Lattice Angles
π/2, π/2, 2 π/3 0
Lattice C/A Ratio
1.57 17
Mechanical
0
Density
0
Density At Room Temperature
8.79 g/cm3 46
Density When Liquid (at m.p.)
8.34 g/cm3 26
Tensile Strength
Not Available 0
Viscosity
Not Available 0
Vapor Pressure
0
Vapor Pressure at 1000 K
0.00 (Pa) 16
Vapor Pressure at 2000 K
Not Available 0
Elasticity properties
0
Shear Modulus
26.30 GPa 28
Bulk Modulus
40.20 GPa 32
Young's Modulus
64.80 GPa 31
Poisson Ratio
0.23 29
Other Mechanical Properties
Ductile, Malleable, Sectile 0
Magnetic
0
Magnetic Characteristics
0
Specific Gravity
8.80 35
Magnetic Ordering
Paramagnetic 0
Permeability
Not Available 0
Susceptibility
Not Available 0
Electrical Properties
0
Electrical Property
Conductor 0
Resistivity
814.00 nΩ·m 4
Electrical Conductivity
0.01 106/cm Ω 52
Electron Affinity
50.00 kJ/mol 21
Thermal
0
Specific Heat
0.16 J/(kg K) 35
Molar Heat Capacity
27.15 J/mol·K 19
Thermal Conductivity
16.20 W/m·K 52
Critical Temperature
Not Available 0
Thermal Expansion
11.20 µm/(m·K) 35
Enthalpy
0
Enthalpy of Vaporization
241.00 kJ/mol 38
Enthalpy of Fusion
11.76 kJ/mol 29
Enthalpy of Atomization
301.00 kJ/mol 36
Standard Molar Entropy
75.30 J/mol.K 8
Summary >>
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