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Dubnium vs Holmium

Dubnium
Holmium
Holmium vs Dubnium


Periodic Table
Symbol
Db  
Ho  
Group Number
5  
13
Not Available  
Period Number
7  
6  
Block
d block  
f block  
Element Family
Transition Metal  
Lanthanide  
CAS Number
53850354  
14
7440600  
29
Space Group Name
Not Available  
P63/mmc  
Space Group Number
Not Available  
194.00  
5
Facts
Interesting Facts
  • IUPAC allotted a temporary name to Dubnium metal as “ Unnilpentium”.
  • In the production of Dubnium, thermal gradient chromatography is used.
  
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
Sources
Produced by Bombarding Am243 with Ne22, Synthetically Produced  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Joint Institute for Nuclear Research  
Marc Delafontaine  
Discovery
In 1968  
In 1878  
Abundance
  
  
Abundance In Universe
Not Available  
5 * 10-8 %  
27
Abundance In Meteorites
Not Available  
0.00 %  
99+
Abundance In Earth's Crust
Not Available  
0.00 %  
38
Abundance In Oceans
Not Available  
0.00 %  
99+
Uses
Uses & Benefits
  • Currently known uses of Dubnium metal are limited to research purpose only.
  
  • 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.
  
Industrial Uses
NA  
NA  
Medical Uses
NA  
NA  
Other Uses
Research Purposes  
Alloys, Nuclear Research  
Biological Properties
  
  
Toxicity
Unknown  
Low Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
37
Not Available  
In Bone
0.00 p.p.m.  
36
Not Available  
Physical Properties
Melting Point
Not Available  
1,461.00 °C  
30
Boiling Point
Not Available  
2,600.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Unknown  
Silvery White  
Luster
Unknown Luster  
Metallic  
Hardness
  
  
Brinell Hardness
Not Available  
746.00 MPa  
13
Vickers Hardness
Not Available  
481.00 MPa  
23
Speed of Sound
Not Available  
2,760.00 m/s  
30
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
Db  
Ho  
Isotopes
  
  
Known Isotopes
10  
28
34  
5
Electronegativity
  
  
Pauling Electronegativity
Not Available  
1.23  
37
Allred Rochow Electronegativity
Not Available  
1.10  
30
Electropositivity
  
  
Pauling Electropositivity
Not Available  
2.77  
17
Ionization Energies
  
  
1st Energy Level
664.80 kJ/mol  
38
581.00 kJ/mol  
99+
2nd Energy Level
1,546.70 kJ/mol  
38
1,140.00 kJ/mol  
99+
3rd Energy Level
2,378.40 kJ/mol  
99+
2,204.00 kJ/mol  
99+
4th Energy Level
3,298.80 kJ/mol  
99+
4,100.00 kJ/mol  
34
5th Energy Level
4,305.20 kJ/mol  
39
Not Available  
Electrochemical Equivalent
Not Available  
2.02 g/amp-hr  
29
Electron Work Function
Not Available  
Not Available  
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic Properties
Atomic Number
105  
13
67  
99+
Electron Configuration
[Rn] 5f14 6d3 7s2  
[Xe] 4f11 6s2  
Crystal Structure
Body Centered Cubic (BCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
HCP-Crystal-Structure-of-Holmium.jpg#100  
Atom
  
  
Number of Protons
105  
13
67  
99+
Number of Neutrons
157  
7
98  
34
Number of Electrons
105  
13
67  
99+
Radius of an Atom
  
  
Atomic Radius
139.00 pm  
39
176.00 pm  
18
Covalent Radius
149.00 pm  
35
192.00 pm  
17
Van der Waals Radius
Not Available  
216.00 pm  
24
Atomic Weight
268.00 amu  
10
164.93 amu  
99+
Atomic Volume
Not Available  
18.70 cm3/mol  
24
Adjacent Atomic Numbers
  
  
Previous Element
Rutherfordium
  
Dysprosium
  
Next Element
Seaborgium
  
Erbium
  
Valence Electron Potential
Not Available  
47.90 (-eV)  
31
Lattice Constant
Not Available  
357.73 pm  
38
Lattice Angles
NA  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
Not Available  
1.57  
17
Mechanical Properties
Density
  
  
Density At Room Temperature
29.30 g/cm3  
5
8.79 g/cm3  
99+
Density When Liquid (at m.p.)
Not Available  
8.34 g/cm3  
26
Tensile Strength
Not Available  
Not Available  
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available  
0.00 (Pa)  
16
Elasticity properties
  
  
Shear Modulus
Not Available  
26.30 GPa  
28
Bulk Modulus
Not Available  
40.20 GPa  
32
Young's Modulus
Not Available  
64.80 GPa  
31
Poisson Ratio
Not Available  
0.23  
29
Other Mechanical Properties
Unknown  
Ductile, Malleable, Sectile  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available  
8.80  
35
Magnetic Ordering
Unknown  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Unknown  
Conductor  
Resistivity
Not Available  
814.00 nΩ·m  
4
Electrical Conductivity
Not Available  
0.01 106/cm Ω  
99+
Electron Affinity
Not Available  
50.00 kJ/mol  
21
Thermal Properties
Specific Heat
Not Available  
0.16 J/(kg K)  
35
Molar Heat Capacity
Not Available  
27.15 J/mol·K  
19
Thermal Conductivity
Not Available  
16.20 W/m·K  
99+
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
Not Available  
11.20 µm/(m·K)  
35
Enthalpy
  
  
Enthalpy of Vaporization
Not Available  
241.00 kJ/mol  
38
Enthalpy of Fusion
Not Available  
11.76 kJ/mol  
29
Enthalpy of Atomization
Not Available  
301.00 kJ/mol  
36
Standard Molar Entropy
Not Available  
75.30 J/mol.K  
8
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