Home
 Compare Metals

Polonium vs Fermium

Polonium
Fermium
Fermium vs Polonium


Periodic Table
Symbol
Po  
Fm  
Group Number
16  
2
3  
15
Period Number
6  
7  
Block
p block  
f block  
Element Family
Post-​Transition  
Actinide  
CAS Number
7440086  
99+
7440724  
19
Space Group Name
Pm-3m  
-  
Space Group Number
221.00  
4
194.00  
7
Facts
Interesting Facts
  • 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.
  
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
  
Sources
Mining, Ores of metals  
Bombarding Pu-239 with Neutrons  
History
  
  
Who Discovered
Pierre Curie and Marie Curie  
Lawrence Berkeley National Laboratory  
Discovery
In 1898  
In 1952  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
35
Abundance In Sun
-  
0.00 %  
30
Abundance In Meteorites
-  
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
24
-  
Uses
Uses & Benefits
  • 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.
  
  • Currently known uses of Fermium metal are limited to research purpose only.
  
Industrial Uses
Aerospace Industry, Ammunition Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Highly Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
254.00 °C  
99+
1,527.00 °C  
26
Boiling Point
962.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
-  
Luster
-  
-  
Hardness
  
  
Mohs Hardness
2.50  
15
6.00  
6
Brinell Hardness
70.00 MPa  
99+
500.00 MPa  
28
Vickers Hardness
30.00 MPa  
99+
600.00 MPa  
28
Speed of Sound
2,260.00 m/s  
99+
2,500.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.70  
3
1.30  
99+
Reflectivity
50.00 %  
31
59.00 %  
24
Allotropes
Yes  
No  
α Allotropes
α-polonium  
-  
β Allotropes
β-polonium  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Po  
Fm  
Isotopes
  
  
Known Isotopes
29  
10
18  
21
Electronegativity
  
  
Pauling Electronegativity
2.00  
8
1.30  
33
Sanderson Electronegativity
2.00  
10
1.30  
25
Allred Rochow Electronegativity
1.76  
3
1.20  
28
Mulliken-Jaffe Electronegativity
2.48  
1
1.30  
33
Allen Electronegativity
2.19  
2
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
812.10 kJ/mol  
14
627.00 kJ/mol  
99+
2nd Energy Level
1,833.20 kJ/mol  
17
1,225.00 kJ/mol  
99+
3rd Energy Level
812.10 kJ/mol  
99+
2,363.00 kJ/mol  
99+
4th Energy Level
8,121.00 kJ/mol  
7
3,792.00 kJ/mol  
99+
5th Energy Level
8,120.00 kJ/mol  
12
6,270.00 kJ/mol  
39
6th Energy Level
8,120.00 kJ/mol  
32
6,270.00 kJ/mol  
99+
7th Energy level
8,120.00 kJ/mol  
26
6,270.00 kJ/mol  
99+
8th Energy Level
8,120.00 kJ/mol  
26
6,270.00 kJ/mol  
99+
9th Energy Level
8,120.00 kJ/mol  
23
7,040.00 kJ/mol  
33
10th Energy Level
8,120.00 kJ/mol  
27
6,270.00 kJ/mol  
99+
11th Energy Level
8,120.00 kJ/mol  
26
6,270.00 kJ/mol  
99+
12th Energy Level
8,120.00 kJ/mol  
99+
62,700.00 kJ/mol  
10
13th Energy Level
8,120.00 kJ/mol  
19
6,270.00 kJ/mol  
38
14th Energy Level
8,120.00 kJ/mol  
18
6,270.00 kJ/mol  
27
15th Energy Level
81,200.00 kJ/mol  
15
62,700.00 kJ/mol  
38
16th Energy Level
81,200.00 kJ/mol  
12
62,700.00 kJ/mol  
28
17th Energy Level
812.10 kJ/mol  
32
627.00 kJ/mol  
99+
18th Energy Level
8,120.00 kJ/mol  
21
6,270.00 kJ/mol  
40
19th Energy Level
812.10 kJ/mol  
29
994.80 kJ/mol  
21
20th Energy Level
812.00 kJ/mol  
22
627.00 kJ/mol  
99+
21st Energy Level
812.10 kJ/mol  
40
627.00 kJ/mol  
99+
22nd Energy Level
812.00 kJ/mol  
17
345.00 kJ/mol  
99+
23rd Energy Level
812.10 kJ/mol  
99+
6,270.00 kJ/mol  
14
24th Energy Level
812.10 kJ/mol  
13
627.60 kJ/mol  
38
25th Energy Level
812.10 kJ/mol  
11
627.00 kJ/mol  
40
26th Energy Level
812.10 kJ/mol  
11
627.60 kJ/mol  
39
27th Energy Level
812.10 kJ/mol  
10
627.60 kJ/mol  
99+
28th Energy Level
812.10 kJ/mol  
16
627.60 kJ/mol  
99+
29th Energy Level
812.10 kJ/mol  
15
627.60 kJ/mol  
99+
30th Energy Level
812.00 kJ/mol  
11
627.60 kJ/mol  
99+
Electrochemical Equivalent
3.90 g/amp-hr  
8
3.20 g/amp-hr  
15
Electron Work Function
4.50 eV  
19
4.47 eV  
21
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
84  
32
100  
18
Electron Configuration
[Xe] 4f14 5d10 6s2 6p4  
[Rn] 5f12 7s2  
Crystal Structure
Monoclinic (MON)  
Not Known  
Crystal Lattice
MON-Crystal-Structure-of-Polonium.jpg#100  
Unknown-Crystal-Structure-of-Fermium.jpg#100  
Atom
  
  
Number of Protons
84  
32
100  
18
Number of Neutrons
125  
20
157  
8
Number of Electrons
84  
32
100  
18
Radius of an Atom
  
  
Atomic Radius
168.00 pm  
25
180.00 pm  
16
Covalent Radius
140.00 pm  
99+
180.00 pm  
23
Van der Waals Radius
197.00 pm  
36
245.00 pm  
13
Atomic Weight
209.00 amu  
28
257.00 amu  
15
Atomic Volume
22.23 cm3/mol  
22
18.00 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Bismuth
  
Einsteinium
  
Next Element
Francium
  
Mendelevium
  
Valence Electron Potential
9.30 (-eV)  
99+
0.00 (-eV)  
99+
Lattice Constant
335.90 pm  
99+
350.00 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.46  
99+
1.63  
13
Mechanical
Density
  
  
Density At Room Temperature
9.20 g/cm3  
99+
9.70 g/cm3  
99+
Density When Liquid (at m.p.)
9.40 g/cm3  
99+
9.70 g/cm3  
99+
Tensile Strength
50.00 MPa  
38
0.10 MPa  
99+
Viscosity
0.00  
26
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
24.00 GPa  
40
30.00 GPa  
27
Bulk Modulus
46.00 GPa  
28
50.00 GPa  
24
Young's Modulus
46.00 GPa  
99+
0.00 GPa  
99+
Poisson Ratio
0.23  
30
0.35  
9
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.32  
99+
9.70  
99+
Magnetic Ordering
Nonmagnetic  
-  
Permeability
0.00 H/m  
15
0.00 H/m  
16
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
0.40 nΩ·m  
99+
7.90 nΩ·m  
99+
Electrical Conductivity
0.02 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
183.30 kJ/mol  
3
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.10 J/(kg K)  
99+
Molar Heat Capacity
26.40 J/mol·K  
36
27.00 J/mol·K  
29
Thermal Conductivity
20.00 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
527.00 K  
99+
1,323.00 K  
99+
Thermal Expansion
23.50 µm/(m·K)  
16
11.00 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
60.30 kJ/mol  
99+
319.20 kJ/mol  
99+
Enthalpy of Fusion
13.00 kJ/mol  
32
13.30 kJ/mol  
30
Enthalpy of Atomization
134.00 kJ/mol  
99+
-  
Standard Molar Entropy
41.10 J/mol.K  
99+
50.00 J/mol.K  
99+
Periodic Table >>
<< All

Compare Post Transition Metals

Post Transition Metals

Post Transition Metals

» More Post Transition Metals

Compare Post Transition Metals

» More Compare Post Transition Metals
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!