Fermium vs Einsteinium
Periodic Table
Symbol
Fm
Es
Group Number
Not Available
Not Available
Period Number
7
7
Block
f block
f block
Element Family
Actinide
Actinide
CAS Number
7440724
19
7429927
99+
Space Group Name
Not Available
Not Available
Space Group Number
Not Available
Not Available
Facts
Interesting Facts
- Fermium metal is highly radioactive in nature.
- Fermium is synthetically produced metal.
- Einsteinium is the transuranic element found in US.
- Only 0.01 mg of Einsteinium was synthesized in 1961.
Sources
Bombarding Pu-239 with Neutrons
Made by Bombarding Uranium with Neutrons
History
Who Discovered
Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory
Discovery
In 1952
In 1952
Abundance
Uses
Uses & Benefits
- Currently known uses of Fermium metal are limited to research purpose only.
- Currently known uses of Einsteinium metal are limited to research purpose only.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
NA
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Unknown
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
860.00 °C
99+
Boiling Point
Not Available
996.00 °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
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Fm
Es
Isotopes
Known Isotopes
18
21
16
23
Electronegativity
Pauling Electronegativity
1.30
32
1.54
26
Allred Rochow Electronegativity
1.20
27
1.20
27
Electropositivity
Pauling Electropositivity
2.70
22
2.70
22
Ionization Energies
1st Energy Level
627.00 kJ/mol
99+
619.00 kJ/mol
99+
2nd Energy Level
1,225.00 kJ/mol
99+
1,216.00 kJ/mol
99+
3rd Energy Level
2,363.00 kJ/mol
99+
2,334.00 kJ/mol
99+
4th Energy Level
3,792.00 kJ/mol
99+
3,734.00 kJ/mol
99+
Electrochemical Equivalent
3.20 g/amp-hr
13
4.74 g/amp-hr
5
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
100
18
99
19
Electron Configuration
[Rn] 5f12 7s2
[Rn] 5f11 7s2
Crystal Structure
Not Known
Face Centered Cubic (FCC)
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100
FCC-Crystal-Structure-of-Einsteinium.jpg#100
Atom
Number of Protons
100
18
99
19
Number of Neutrons
157
7
153
9
Number of Electrons
100
18
99
19
Radius of an Atom
Atomic Radius
Not Available
186.00 pm
9
Van der Waals Radius
245.00 pm
9
Not Available
Atomic Weight
257.00 amu
15
252.00 amu
16
Atomic Volume
Not Available
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
Not Available
Lattice Constant
Not Available
Not Available
Lattice Angles
NA
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
Not Available
8.84 g/cm3
99+
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
Magnetic Ordering
Unknown
Paramagnetic
Electrical Properties
Thermal Properties
Specific Heat
Not Available
Not Available
Molar Heat Capacity
Not Available
Not Available
Thermal Conductivity
Not Available
Not Available
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Standard Molar Entropy
Not Available
Not Available
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