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Fm Element
Fermium


Periodic Table
Symbol
Fm
Group Number
3 15
Period Number
7 1
Block
f block
Element Family
Actinide
CAS Number
7440724 19
Space Group Name
-
Space Group Number
194.00 7
Facts
Interesting Facts
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
Sources
Bombarding Pu-239 with Neutrons
History
Who Discovered
Lawrence Berkeley National Laboratory
Discovery
In 1952
Abundance
Abundance In Universe
0.00 % 35
Abundance In Sun
0.00 % 30
Abundance In Meteorites
0.00 % 54
Abundance In Earth's Crust
0.00 % 60
Abundance In Oceans
-
Abundance In Humans
-
Uses
Uses & Benefits
  • Currently known uses of Fermium metal are limited to research purpose only.
Industrial Uses
-
Medical Uses
-
Other Uses
-
Biological Properties
Toxicity
-
Present in Human Body
No
In Blood
0.00 Blood/mg dm-3 40
In Bone
0.00 p.p.m. 41
Physical
Melting Point
1,527.00 °C 26
Boiling Point
0.00 °C 82
Appearance
Physical State
Solid
Color
-
Luster
-
Hardness
Mohs Hardness
6.00 6
Brinell Hardness
500.00 MPa 28
Vickers Hardness
600.00 MPa 28
Speed of Sound
2,500.00 m/s 51
Optical Properties
Refractive Index
1.30 43
Reflectivity
59.00 % 24
Allotropes
No
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical
Chemical Formula
Fm
Isotopes
Known Isotopes
18 21
Electronegativity
Pauling Electronegativity
1.30 33
Sanderson Electronegativity
1.30 25
Allred Rochow Electronegativity
1.20 28
Mulliken-Jaffe Electronegativity
1.30 33
Allen Electronegativity
1.30 40
Electropositivity
Pauling Electropositivity
2.70 22
Ionization Energies
1st Energy Level
627.00 kJ/mol 47
2nd Energy Level
1,225.00 kJ/mol 59
3rd Energy Level
2,363.00 kJ/mol 55
4th Energy Level
3,792.00 kJ/mol 56
5th Energy Level
6,270.00 kJ/mol 39
6th Energy Level
6,270.00 kJ/mol 53
7th Energy level
6,270.00 kJ/mol 47
8th Energy Level
6,270.00 kJ/mol 45
9th Energy Level
7,040.00 kJ/mol 33
10th Energy Level
6,270.00 kJ/mol 43
11th Energy Level
6,270.00 kJ/mol 47
12th Energy Level
62,700.00 kJ/mol 10
13th Energy Level
6,270.00 kJ/mol 38
14th Energy Level
6,270.00 kJ/mol 27
15th Energy Level
62,700.00 kJ/mol 38
16th Energy Level
62,700.00 kJ/mol 28
17th Energy Level
627.00 kJ/mol 49
18th Energy Level
6,270.00 kJ/mol 40
19th Energy Level
994.80 kJ/mol 21
20th Energy Level
627.00 kJ/mol 42
21st Energy Level
627.00 kJ/mol 60
22nd Energy Level
345.00 kJ/mol 82
23rd Energy Level
6,270.00 kJ/mol 14
24th Energy Level
627.60 kJ/mol 38
25th Energy Level
627.00 kJ/mol 40
26th Energy Level
627.60 kJ/mol 39
27th Energy Level
627.60 kJ/mol 41
28th Energy Level
627.60 kJ/mol 46
29th Energy Level
627.60 kJ/mol 47
30th Energy Level
627.60 kJ/mol 42
Electrochemical Equivalent
3.20 g/amp-hr 15
Electron Work Function
4.47 eV 21
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Atomic
Atomic Number
100 18
Electron Configuration
[Rn] 5f12 7s2
Crystal Structure
Not Known
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100
Atom
Number of Protons
100 18
Number of Neutrons
157 8
Number of Electrons
100 18
Radius of an Atom
Atomic Radius
180.00 pm 16
Covalent Radius
180.00 pm 23
Van der Waals Radius
245.00 pm 13
Atomic Weight
257.00 amu 15
Atomic Volume
18.00 cm3/mol 41
Adjacent Atomic Numbers
Previous Element
52
Next Element
87
Valence Electron Potential
0.00 (-eV) 78
Lattice Constant
350.00 pm 48
Lattice Angles
-
Lattice C/A Ratio
1.63 13
Mechanical
Density
Density At Room Temperature
9.70 g/cm3 44
Density When Liquid (at m.p.)
9.70 g/cm3 43
Tensile Strength
0.10 MPa 52
Viscosity
0.00 25
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa) 22
Vapor Pressure at 2000 K
0.00 (Pa) 30
Elasticity properties
Shear Modulus
30.00 GPa 27
Bulk Modulus
50.00 GPa 24
Young's Modulus
0.00 GPa 74
Poisson Ratio
0.35 9
Other Mechanical Properties
-
Magnetic
Magnetic Characteristics
Specific Gravity
9.70 45
Magnetic Ordering
-
Permeability
0.00 H/m 16
Susceptibility
0.00 24
Electrical Properties
Electrical Property
-
Resistivity
7.90 nΩ·m 55
Electrical Conductivity
0.00 106/cm Ω 71
Electron Affinity
0.00 kJ/mol 49
Thermal
Specific Heat
0.10 J/(kg K) 44
Molar Heat Capacity
27.00 J/mol·K 29
Thermal Conductivity
0.00 W/m·K 80
Critical Temperature
1,323.00 K 47
Thermal Expansion
11.00 µm/(m·K) 49
Enthalpy
Enthalpy of Vaporization
319.20 kJ/mol 44
Enthalpy of Fusion
13.30 kJ/mol 30
Enthalpy of Atomization
-
Standard Molar Entropy
50.00 J/mol.K 43
Summary >>
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