Fermium vs Polonium
Periodic Table
Symbol
Fm
Po
Group Number
Not Available
16
2
Period Number
7
6
Block
f block
p block
Element Family
Actinide
Post-Transition
CAS Number
7440724
19
7440086
99+
Space Group Name
Not Available
Pm-3m
Space Group Number
Not Available
221.00
3
Facts
Interesting Facts
- Fermium metal is highly radioactive in nature.
- Fermium is synthetically produced metal.
- 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
Bombarding Pu-239 with Neutrons
Mining, Ores of metals
History
Who Discovered
Lawrence Berkeley National Laboratory
Pierre Curie and Marie Curie
Discovery
In 1952
In 1898
Abundance
Abundance In Oceans
Not Available
0.00 %
99+
Uses
Uses & Benefits
- Currently known uses of Fermium metal are limited to research purpose only.
- 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
NA
Alloys
Biological Properties
Toxicity
Unknown
Highly Toxic
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
37
In Bone
0.00 p.p.m.
36
0.00 p.p.m.
36
Physical Properties
Melting Point
1,527.00 °C
26
254.00 °C
99+
Boiling Point
Not Available
962.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Unknown
Silver
Luster
Not Defined
NA
Hardness
Speed of Sound
Not Available
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
Fm
Po
Isotopes
Known Isotopes
18
21
29
10
Electronegativity
Pauling Electronegativity
1.30
32
2.00
7
Allred Rochow Electronegativity
1.20
27
1.76
2
Mulliken-Jaffe Electronegativity
Not Available
2.48
1
Allen Electronegativity
Not Available
2.19
2
Electropositivity
Pauling Electropositivity
2.70
22
2.00
99+
Ionization Energies
1st Energy Level
627.00 kJ/mol
99+
812.10 kJ/mol
14
2nd Energy Level
1,225.00 kJ/mol
99+
Not Available
3rd Energy Level
2,363.00 kJ/mol
99+
Not Available
4th Energy Level
3,792.00 kJ/mol
99+
Not Available
Electrochemical Equivalent
3.20 g/amp-hr
13
3.90 g/amp-hr
8
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
100
18
84
32
Electron Configuration
[Rn] 5f12 7s2
[Xe] 4f14 5d10 6s2 6p4
Crystal Structure
Not Known
Monoclinic (MON)
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100
MON-Crystal-Structure-of-Polonium.jpg#100
Atom
Number of Protons
100
18
84
32
Number of Neutrons
157
7
125
19
Number of Electrons
100
18
84
32
Radius of an Atom
Atomic Radius
Not Available
168.00 pm
23
Covalent Radius
Not Available
140.00 pm
99+
Van der Waals Radius
245.00 pm
9
197.00 pm
29
Atomic Weight
257.00 amu
15
209.00 amu
28
Atomic Volume
Not Available
22.23 cm3/mol
13
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
Not Available
Lattice Constant
Not Available
335.90 pm
99+
Lattice Angles
NA
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
Not Available
9.20 g/cm3
99+
Density When Liquid (at m.p.)
Not Available
9.40 g/cm3
19
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
Not Available
9.32
31
Magnetic Ordering
Unknown
Nonmagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
Not Available
0.40 nΩ·m
99+
Electrical Conductivity
Not Available
0.02 106/cm Ω
99+
Electron Affinity
Not Available
183.30 kJ/mol
3
Thermal Properties
Specific Heat
Not Available
0.12 J/(kg K)
40
Molar Heat Capacity
Not Available
26.40 J/mol·K
28
Thermal Conductivity
Not Available
20.00 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
23.50 µm/(m·K)
16
Enthalpy
Enthalpy of Vaporization
Not Available
60.30 kJ/mol
99+
Enthalpy of Fusion
Not Available
13.00 kJ/mol
26
Enthalpy of Atomization
Not Available
134.00 kJ/mol
99+
Standard Molar Entropy
Not Available
Not Available
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