Home
 Compare Metals

Holmium Polonium Comparison

Holmium
Polonium
Polonium Holmium comparison


Periodic Table
Symbol
Ho   
Po   
Group Number
Not Available   
16   
2
Period Number
6   
6   
Block
f block   
p block   
Element Family
Lanthanide   
Post-​Transition   
CAS Number
7440600   
29
7440086   
99+
Space Group Name
P63/mmc   
Pm-3m   
Space Group Number
194.00   
5
221.00   
3
Facts
Interesting Facts
  • Holmium metal is very soft and malleable.
  • Holmium metal is well known for its corrosion resistivity.
  
  • Polonium was the first radioactive element to be discovered.
  • Polonium element and its compounds are highly radioactive.
  • Its alloy with Beryllium provides source of neutrons.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
Mining, Ores of metals   
History
  
  
Who Discovered
Marc Delafontaine   
Pierre Curie and Marie Curie   
Discovery
In 1878   
In 1898   
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+
0.00 %   
99+
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.
  
  • Polonium metal has different Allotropes, it is used in antistatic devices and for research purpose.
  • A 1 gram of Polonium can reach a temperature of 500°C, hence it is used as a heat source for space equipment.
  
Industrial Uses
NA   
Aerospace Industry, Ammunition Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research   
Alloys   
Biological Properties
  
  
Toxicity
Low Toxic   
Highly Toxic   
Present in Human Body
No   
No   
In Blood
Not Available   
0.00 Blood/mg dm-3   
37
In Bone
Not Available   
0.00 p.p.m.   
36
Physical Properties
Melting Point
1,461.00 °C   
30
254.00 °C   
99+
Boiling Point
2,600.00 °C   
99+
962.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silver   
Luster
Metallic   
NA   
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   
Yes   
α Allotropes
Not Available   
α-polonium   
β Allotropes
Not Available   
β-polonium   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
Ho   
Po   
Isotopes
  
  
Known Isotopes
34   
5
29   
10
Electronegativity
  
  
Pauling Electronegativity
1.23   
37
2.00   
7
Allred Rochow Electronegativity
1.10   
30
1.76   
2
Mulliken-Jaffe Electronegativity
Not Available   
2.48   
1
Allen Electronegativity
Not Available   
2.19   
2
Electropositivity
  
  
Pauling Electropositivity
2.77   
17
2.00   
99+
Ionization Energies
  
  
1st Energy Level
581.00 kJ/mol   
99+
812.10 kJ/mol   
14
2nd Energy Level
1,140.00 kJ/mol   
99+
Not Available   
3rd Energy Level
2,204.00 kJ/mol   
99+
Not Available   
4th Energy Level
4,100.00 kJ/mol   
34
Not Available   
Electrochemical Equivalent
2.02 g/amp-hr   
29
3.90 g/amp-hr   
8
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+
84   
32
Electron Configuration
[Xe] 4f11 6s2   
[Xe] 4f14 5d10 6s2 6p4   
Crystal Structure
Hexagonal Close Packed (HCP)   
Monoclinic (MON)   
Crystal Lattice
HCP-Crystal-Structure-of-Holmium.jpg#100   
MON-Crystal-Structure-of-Polonium.jpg#100   
Atom
  
  
Number of Protons
67   
99+
84   
32
Number of Neutrons
98   
34
125   
19
Number of Electrons
67   
99+
84   
32
Radius of an Atom
  
  
Atomic Radius
176.00 pm   
18
168.00 pm   
23
Covalent Radius
192.00 pm   
17
140.00 pm   
99+
Van der Waals Radius
216.00 pm   
24
197.00 pm   
29
Atomic Weight
164.93 amu   
99+
209.00 amu   
28
Atomic Volume
18.70 cm3/mol   
24
22.23 cm3/mol   
13
Adjacent Atomic Numbers
  
  
Previous Element
Dysprosium
  
Bismuth
  
Next Element
Erbium
  
Francium
  
Valence Electron Potential
47.90 (-eV)   
31
Not Available   
Lattice Constant
357.73 pm   
38
335.90 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+
9.20 g/cm3   
99+
Density When Liquid (at m.p.)
8.34 g/cm3   
26
9.40 g/cm3   
19
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
Not Available   
Bulk Modulus
40.20 GPa   
32
Not Available   
Young's Modulus
64.80 GPa   
31
Not Available   
Poisson Ratio
0.23   
29
Not Available   
Other Mechanical Properties
Ductile, Malleable, Sectile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
8.80   
35
9.32   
31
Magnetic Ordering
Paramagnetic   
Nonmagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
814.00 nΩ·m   
4
0.40 nΩ·m   
99+
Electrical Conductivity
0.01 106/cm Ω   
99+
0.02 106/cm Ω   
99+
Electron Affinity
50.00 kJ/mol   
21
183.30 kJ/mol   
3
Thermal Properties
Specific Heat
0.16 J/(kg K)   
35
0.12 J/(kg K)   
40
Molar Heat Capacity
27.15 J/mol·K   
19
26.40 J/mol·K   
28
Thermal Conductivity
16.20 W/m·K   
99+
20.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
11.20 µm/(m·K)   
35
23.50 µm/(m·K)   
16
Enthalpy
  
  
Enthalpy of Vaporization
241.00 kJ/mol   
38
60.30 kJ/mol   
99+
Enthalpy of Fusion
11.76 kJ/mol   
29
13.00 kJ/mol   
26
Enthalpy of Atomization
301.00 kJ/mol   
36
134.00 kJ/mol   
99+
Standard Molar Entropy
75.30 J/mol.K   
8
Not Available   
Summary >>
<< Thermal

Compare Lanthanide Series

Lanthanide Metals

Lanthanide Metals

» More Lanthanide Metals

Compare Lanthanide Series

» More Compare Lanthanide Series
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!