Fermium vs Manganese
Periodic Table
Symbol
Fm
Mn
Group Number
Not Available
7
11
Period Number
7
4
Block
f block
d block
Element Family
Actinide
Transition Metal
CAS Number
7440724
19
7439965
99+
Space Group Name
Not Available
I_ 43m
Space Group Number
Not Available
217.00
4
Facts
Interesting Facts
- Fermium metal is highly radioactive in nature.
- Fermium is synthetically produced metal.
- Manganese is an essential trace element in all forms of life.
- Manganese metal oxidizes very easily, but it does not fuse that easily.
Sources
Bombarding Pu-239 with Neutrons
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Lawrence Berkeley National Laboratory
Johann Gottlieb Gahn
Discovery
In 1952
In 1774
Abundance
Abundance In Universe
Not Available
8 * 10-4 %
8
Abundance In Sun
~-9999 %
~0.001 %
8
Abundance In Meteorites
Not Available
0.27 %
8
Abundance In Earth's Crust
Not Available
0.11 %
8
Abundance In Oceans
Not Available
0.00 %
13
Abundance In Humans
Not Available
0.00 %
13
Uses
Uses & Benefits
- Currently known uses of Fermium metal are limited to research purpose only.
- This metal is very brittle hence it mostly not used as a pure metal, but its alloys are very useful
- Its alloy Manganese steel is extremely strong and used in railway tracks, safes, prison bars and riffle barrels.
Industrial Uses
NA
Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
NA
Other Uses
NA
Alloys
Biological Properties
Toxicity
Unknown
Toxic
Present in Human Body
No
Yes
In Blood
0.00 Blood/mg dm-3
37
0.08 Blood/mg dm-3
14
In Bone
0.00 p.p.m.
36
100.00 p.p.m.
8
Physical Properties
Melting Point
1,527.00 °C
26
1,245.00 °C
37
Boiling Point
Not Available
1,962.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Unknown
Silver
Luster
Not Defined
Metallic
Hardness
Mohs Hardness
Not Available
6.00
6
Brinell Hardness
Not Available
196.00 MPa
99+
Speed of Sound
Not Available
5,150.00 m/s
7
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
Mn
Isotopes
Known Isotopes
18
21
21
18
Electronegativity
Pauling Electronegativity
1.30
32
1.55
25
Sanderson Electronegativity
Not Available
2.20
7
Allred Rochow Electronegativity
1.20
27
1.60
9
Allen Electronegativity
Not Available
1.75
15
Electropositivity
Pauling Electropositivity
2.70
22
2.45
29
Ionization Energies
1st Energy Level
627.00 kJ/mol
99+
717.30 kJ/mol
30
2nd Energy Level
1,225.00 kJ/mol
99+
1,509.00 kJ/mol
39
3rd Energy Level
2,363.00 kJ/mol
99+
3,248.00 kJ/mol
21
4th Energy Level
3,792.00 kJ/mol
99+
4,940.00 kJ/mol
20
5th Energy Level
Not Available
6,990.00 kJ/mol
17
6th Energy Level
Not Available
9,220.00 kJ/mol
16
7th Energy level
Not Available
11,500.00 kJ/mol
16
8th Energy Level
Not Available
18,770.00 kJ/mol
5
9th Energy Level
Not Available
21,400.00 kJ/mol
6
10th Energy Level
Not Available
23,960.00 kJ/mol
9
11th Energy Level
Not Available
27,590.00 kJ/mol
10
12th Energy Level
Not Available
30,330.00 kJ/mol
10
13th Energy Level
Not Available
33,150.00 kJ/mol
11
14th Energy Level
Not Available
38,880.00 kJ/mol
10
15th Energy Level
Not Available
41,987.00 kJ/mol
13
16th Energy Level
Not Available
109,480.00 kJ/mol
1
17th Energy Level
Not Available
118,100.00 kJ/mol
2
18th Energy Level
Not Available
127,100.00 kJ/mol
3
19th Energy Level
Not Available
138,600.00 kJ/mol
4
20th Energy Level
Not Available
148,500.00 kJ/mol
6
21st Energy Level
Not Available
158,600.00 kJ/mol
6
22nd Energy Level
Not Available
172,500.00 kJ/mol
5
23rd Energy Level
Not Available
181,380.00 kJ/mol
5
Electrochemical Equivalent
3.20 g/amp-hr
13
0.29 g/amp-hr
99+
Electron Work Function
Not Available
4.10 eV
25
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
100
18
25
99+
Electron Configuration
[Rn] 5f12 7s2
[Ar] 3d5 4s2
Crystal Structure
Not Known
Body Centered Cubic (BCC)
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
100
18
25
99+
Number of Neutrons
157
7
30
99+
Number of Electrons
100
18
25
99+
Radius of an Atom
Atomic Radius
Not Available
127.00 pm
99+
Covalent Radius
Not Available
139.00 pm
99+
Van der Waals Radius
245.00 pm
9
200.00 pm
28
Atomic Weight
257.00 amu
15
54.94 amu
99+
Atomic Volume
Not Available
1.39 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
220.00 (-eV)
2
Lattice Constant
Not Available
891.25 pm
1
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
7.21 g/cm3
99+
Density When Liquid (at m.p.)
Not Available
5.95 g/cm3
99+
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
Not Available
0.00 (Pa)
12
Elasticity properties
Bulk Modulus
Not Available
120.00 GPa
14
Young's Modulus
Not Available
198.00 GPa
12
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
Not Available
7.21
99+
Magnetic Ordering
Unknown
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Conductor
Resistivity
Not Available
1.44 nΩ·m
99+
Electrical Conductivity
Not Available
0.01 106/cm Ω
99+
Electron Affinity
Not Available
0.00 kJ/mol
40
Thermal Properties
Specific Heat
Not Available
0.48 J/(kg K)
11
Molar Heat Capacity
Not Available
26.32 J/mol·K
29
Thermal Conductivity
Not Available
7.81 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
21.70 µm/(m·K)
21
Enthalpy
Enthalpy of Vaporization
Not Available
219.70 kJ/mol
99+
Enthalpy of Fusion
Not Available
14.64 kJ/mol
23
Enthalpy of Atomization
Not Available
280.30 kJ/mol
38
Standard Molar Entropy
Not Available
32.00 J/mol.K
99+
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