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Holmium Promethium Comparison

Holmium
Promethium
Promethium Holmium comparison


Periodic Table
Symbol
Ho   
Pm   
Group Number
Not Available   
Not Available   
Period Number
6   
6   
Block
f block   
f block   
Element Family
Lanthanide   
Lanthanide   
CAS Number
7440600   
29
7440122   
99+
Space Group Name
P63/mmc   
Not Available   
Space Group Number
194.00   
5
Not Available   
Facts
Interesting Facts
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining   
History
  
  
Who Discovered
Marc Delafontaine   
Chien Shiung Wu, Emilio Segrè, Hans Bethe   
Discovery
In 1878   
In 1942   
Abundance
  
  
Abundance In Universe
5 * 10-8 %   
27
Not Available   
Abundance In Meteorites
0.00 %   
99+
Not Available   
Abundance In Earth's Crust
0.00 %   
38
Not Available   
Abundance In Oceans
0.00 %   
99+
Not Available   
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.
  
  • It is used for research purpose. Very small amount of this metal is used in atomic batteries.
  • Its radioactive decay is used for a phosphor to give off light. The light emitted is converted into electricity.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research   
NA   
Biological Properties
  
  
Toxicity
Low Toxic   
Non Toxic   
Present in Human Body
No   
No   
In Blood
Not Available   
0.00 Blood/mg dm-3   
37
Physical Properties
Melting Point
1,461.00 °C   
30
1,042.00 °C   
99+
Boiling Point
2,600.00 °C   
99+
3,000.00 °C   
31
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Unknown   
Luster
Metallic   
Metallic   
Hardness
  
  
Brinell Hardness
746.00 MPa   
13
Not Available   
Vickers Hardness
481.00 MPa   
23
Not Available   
Speed of Sound
2,760.00 m/s   
30
Not Available   
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   
Pm   
Isotopes
  
  
Known Isotopes
34   
5
27   
12
Electronegativity
  
  
Pauling Electronegativity
1.23   
37
Not Available   
Allred Rochow Electronegativity
1.10   
30
1.07   
32
Electropositivity
  
  
Pauling Electropositivity
2.77   
17
Not Available   
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
540.00 kJ/mol   
99+
2nd Energy Level
1,140.00 kJ/mol   
99+
1,050.00 kJ/mol   
99+
3rd Energy Level
2,204.00 kJ/mol   
99+
2,150.00 kJ/mol   
99+
4th Energy Level
4,100.00 kJ/mol   
34
3,970.00 kJ/mol   
38
Electrochemical Equivalent
2.02 g/amp-hr   
29
1.80 g/amp-hr   
36
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
67   
99+
61   
99+
Electron Configuration
[Xe] 4f11 6s2   
[Xe] 4f5 6s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
HCP-Crystal-Structure-of-Holmium.jpg#100   
DHCP-Crystal-Structure-of-Promethium.jpg#100   
Atom
  
  
Number of Protons
67   
99+
61   
99+
Number of Neutrons
98   
34
84   
40
Number of Electrons
67   
99+
61   
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm   
18
183.00 pm   
10
Covalent Radius
192.00 pm   
17
199.00 pm   
12
Van der Waals Radius
216.00 pm   
24
236.00 pm   
16
Atomic Weight
164.93 amu   
99+
145.00 amu   
99+
Atomic Volume
18.70 cm3/mol   
24
22.39 cm3/mol   
12
Adjacent Atomic Numbers
  
  
Previous Element
Dysprosium
  
Neodymium
  
Next Element
Erbium
  
Samarium
  
Valence Electron Potential
47.90 (-eV)   
31
44.10 (-eV)   
39
Lattice Constant
357.73 pm   
38
Not Available   
Lattice Angles
π/2, π/2, 2 π/3   
Unknown   
Lattice C/A Ratio
1.57   
17
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
8.79 g/cm3   
99+
7.26 g/cm3   
99+
Density When Liquid (at m.p.)
8.34 g/cm3   
26
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
16
Not Available   
Elasticity properties
  
  
Shear Modulus
26.30 GPa   
28
18.00 GPa   
36
Bulk Modulus
40.20 GPa   
32
33.00 GPa   
36
Young's Modulus
64.80 GPa   
31
46.00 GPa   
38
Poisson Ratio
0.23   
29
0.28   
17
Other Mechanical Properties
Ductile, Malleable, Sectile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
8.80   
35
7.26   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
814.00 nΩ·m   
4
0.75 nΩ·m   
99+
Electrical Conductivity
0.01 106/cm Ω   
99+
Not Available   
Electron Affinity
50.00 kJ/mol   
21
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
0.16 J/(kg K)   
35
0.18 J/(kg K)   
33
Molar Heat Capacity
27.15 J/mol·K   
19
Not Available   
Thermal Conductivity
16.20 W/m·K   
99+
17.90 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
11.20 µm/(m·K)   
35
9.00 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
241.00 kJ/mol   
38
Not Available   
Enthalpy of Fusion
11.76 kJ/mol   
29
7.50 kJ/mol   
99+
Enthalpy of Atomization
301.00 kJ/mol   
36
310.00 kJ/mol   
34
Standard Molar Entropy
75.30 J/mol.K   
8
Not Available   
Summary >>
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