Fermium vs Technetium
Periodic Table
Symbol
Fm
Tc
Group Number
Not Available
7
11
Period Number
7
5
Block
f block
d block
Element Family
Actinide
Transition Metal
CAS Number
7440724
19
7440268
99+
Space Group Name
Not Available
P63/mmc
Space Group Number
Not Available
194.00
5
Facts
Interesting Facts
- Fermium metal is highly radioactive in nature.
- Fermium is synthetically produced metal.
- Original name of Technetium was Masurium.
- At the time of its discovery it found in sample of Molybdenum.
Sources
Bombarding Pu-239 with Neutrons
Made by Bombarding Molybdenum with Deuterons
History
Who Discovered
Lawrence Berkeley National Laboratory
Emilio Segrè and Carlo Perriero
Discovery
In 1952
In 1937
Abundance
Uses
Uses & Benefits
- Currently known uses of Fermium metal are limited to research purpose only.
- Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
NA
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Unknown
Low 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
2,200.00 °C
9
Boiling Point
Not Available
4,877.00 °C
7
Appearance
Physical State
Solid
Solid
Color
Unknown
Shiny Gray
Luster
Not Defined
NA
Hardness
Speed of Sound
Not Available
16,200.00 m/s
1
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
Tc
Isotopes
Known Isotopes
18
21
18
21
Electronegativity
Pauling Electronegativity
1.30
32
1.90
11
Allred Rochow Electronegativity
1.20
27
1.36
20
Allen Electronegativity
Not Available
1.51
28
Electropositivity
Pauling Electropositivity
2.70
22
2.10
99+
Ionization Energies
1st Energy Level
627.00 kJ/mol
99+
702.00 kJ/mol
36
2nd Energy Level
1,225.00 kJ/mol
99+
1,470.00 kJ/mol
99+
3rd Energy Level
2,363.00 kJ/mol
99+
2,850.00 kJ/mol
33
4th Energy Level
3,792.00 kJ/mol
99+
Not Available
Electrochemical Equivalent
3.20 g/amp-hr
13
0.52 g/amp-hr
99+
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
100
18
43
99+
Electron Configuration
[Rn] 5f12 7s2
[Kr] 4d5 5s2
Crystal Structure
Not Known
Hexagonal Close Packed (HCP)
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100
HCP-Crystal-Structure-of-Technetium.jpg#100
Atom
Number of Protons
100
18
43
99+
Number of Neutrons
157
7
55
99+
Number of Electrons
100
18
43
99+
Radius of an Atom
Atomic Radius
Not Available
136.00 pm
99+
Covalent Radius
Not Available
147.00 pm
37
Van der Waals Radius
245.00 pm
9
200.00 pm
28
Atomic Weight
257.00 amu
15
98.00 amu
99+
Atomic Volume
Not Available
8.50 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
180.00 (-eV)
3
Lattice Constant
Not Available
273.50 pm
99+
Lattice Angles
NA
π/2, π/2, 2 π/3
Lattice C/A Ratio
Not Available
1.60
5
Mechanical Properties
Density
Density At Room Temperature
Not Available
11.00 g/cm3
34
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
11.50
24
Magnetic Ordering
Unknown
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
Not Available
200.00 nΩ·m
18
Electrical Conductivity
Not Available
0.07 106/cm Ω
30
Electron Affinity
Not Available
53.00 kJ/mol
18
Thermal Properties
Specific Heat
Not Available
0.21 J/(kg K)
29
Molar Heat Capacity
Not Available
24.27 J/mol·K
99+
Thermal Conductivity
Not Available
50.60 W/m·K
30
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
7.10 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
Not Available
660.00 kJ/mol
6
Enthalpy of Fusion
Not Available
23.01 kJ/mol
9
Enthalpy of Atomization
Not Available
649.00 kJ/mol
8
Standard Molar Entropy
Not Available
181.10 J/mol.K
2
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