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Fermium vs Chromium

Fermium
Chromium
Chromium vs Fermium


Periodic Table
Symbol
Fm  
Cr  
Group Number
3  
15
6  
12
Period Number
7  
4  
Block
f block  
d block  
Element Family
Actinide  
Transition Metal  
CAS Number
7440724  
19
7440473  
39
Space Group Name
-  
Im_ 3m  
Space Group Number
194.00  
7
229.00  
2
Facts
Interesting Facts
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
  
  • Chromium is highly reactive, hence it is not found free in nature.
  • Ores of Chromites mineral are the major source of Chromium metal.
  • Almost 90% leather tanning is done with the help of chromium.
  
Sources
Bombarding Pu-239 with Neutrons  
Found in Minerals, Mining, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
Louis Nicolas Vauquelin  
Discovery
In 1952  
In Between 1797 - 1798  
Abundance
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
8
Abundance In Sun
0.00 %  
30
0.00 %  
7
Abundance In Meteorites
0.00 %  
99+
0.30 %  
7
Abundance In Earth's Crust
0.00 %  
99+
0.01 %  
13
Abundance In Oceans
-  
0.00 %  
16
Abundance In Humans
-  
0.00 %  
19
Uses
Uses & Benefits
  • Currently known uses of Fermium metal are limited to research purpose only.
  
  • It is used to harden the steel and produces a stainless steel and other various alloys.
  • It is also used to give proper finish to polished mirrors. Its chromium plates are used in bathroom fittings.
  
Industrial Uses
-  
Automobile Industry, Chemical Industry  
Medical Uses
-  
-  
Other Uses
-  
Alloys  
Biological Properties
  
  
Toxicity
-  
Highly Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.11 Blood/mg dm-3  
12
In Bone
0.00 p.p.m.  
99+
0.33 p.p.m.  
25
Physical
Melting Point
1,527.00 °C  
26
1,857.00 °C  
14
Boiling Point
0.00 °C  
99+
2,672.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
Silver  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
8.50  
1
Brinell Hardness
500.00 MPa  
28
687.00 MPa  
18
Vickers Hardness
600.00 MPa  
28
1,060.00 MPa  
17
Speed of Sound
2,500.00 m/s  
99+
5,940.00 m/s  
8
Optical Properties
  
  
Refractive Index
1.30  
99+
2.97  
2
Reflectivity
59.00 %  
24
70.00 %  
13
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Fm  
Cr  
Isotopes
  
  
Known Isotopes
18  
21
21  
18
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.66  
19
Sanderson Electronegativity
1.30  
25
1.66  
17
Allred Rochow Electronegativity
1.20  
28
1.56  
11
Mulliken-Jaffe Electronegativity
1.30  
33
1.66  
19
Allen Electronegativity
1.30  
40
1.65  
22
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.34  
36
Ionization Energies
  
  
1st Energy Level
627.00 kJ/mol  
99+
26,130.00 kJ/mol  
1
2nd Energy Level
1,225.00 kJ/mol  
99+
28,750.00 kJ/mol  
1
3rd Energy Level
2,363.00 kJ/mol  
99+
34,230.00 kJ/mol  
1
4th Energy Level
3,792.00 kJ/mol  
99+
37,066.00 kJ/mol  
1
5th Energy Level
6,270.00 kJ/mol  
39
97,510.00 kJ/mol  
1
6th Energy Level
6,270.00 kJ/mol  
99+
105,800.00 kJ/mol  
1
7th Energy level
6,270.00 kJ/mol  
99+
114,300.00 kJ/mol  
1
8th Energy Level
6,270.00 kJ/mol  
99+
125,300.00 kJ/mol  
1
9th Energy Level
7,040.00 kJ/mol  
33
134,700.00 kJ/mol  
1
10th Energy Level
6,270.00 kJ/mol  
99+
144,300.00 kJ/mol  
1
11th Energy Level
6,270.00 kJ/mol  
99+
26,130.00 kJ/mol  
12
12th Energy Level
62,700.00 kJ/mol  
10
28,750.00 kJ/mol  
36
13th Energy Level
6,270.00 kJ/mol  
38
34,230.00 kJ/mol  
10
14th Energy Level
6,270.00 kJ/mol  
27
37,066.00 kJ/mol  
12
15th Energy Level
62,700.00 kJ/mol  
38
97,510.00 kJ/mol  
2
16th Energy Level
62,700.00 kJ/mol  
28
105,800.00 kJ/mol  
2
17th Energy Level
627.00 kJ/mol  
99+
114,300.00 kJ/mol  
3
18th Energy Level
6,270.00 kJ/mol  
40
125,300.00 kJ/mol  
4
19th Energy Level
994.80 kJ/mol  
21
134,700.00 kJ/mol  
5
20th Energy Level
627.00 kJ/mol  
99+
144,300.00 kJ/mol  
7
21st Energy Level
627.00 kJ/mol  
99+
157,700.00 kJ/mol  
7
22nd Energy Level
345.00 kJ/mol  
99+
166,090.00 kJ/mol  
6
23rd Energy Level
6,270.00 kJ/mol  
14
653.80 kJ/mol  
99+
24th Energy Level
627.60 kJ/mol  
38
653.80 kJ/mol  
32
25th Energy Level
627.00 kJ/mol  
40
653.80 kJ/mol  
34
26th Energy Level
627.60 kJ/mol  
39
653.80 kJ/mol  
33
27th Energy Level
627.60 kJ/mol  
99+
652.90 kJ/mol  
34
28th Energy Level
627.60 kJ/mol  
99+
653.80 kJ/mol  
39
29th Energy Level
627.60 kJ/mol  
99+
653.80 kJ/mol  
40
30th Energy Level
627.60 kJ/mol  
99+
653.80 kJ/mol  
36
Electrochemical Equivalent
3.20 g/amp-hr  
15
0.32 g/amp-hr  
99+
Electron Work Function
4.47 eV  
21
4.50 eV  
19
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
100  
18
24  
99+
Electron Configuration
[Rn] 5f12 7s2  
[Ar] 3d5 4s1  
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
24  
99+
Number of Neutrons
157  
8
28  
99+
Number of Electrons
100  
18
24  
99+
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
128.00 pm  
99+
Covalent Radius
180.00 pm  
23
139.00 pm  
99+
Van der Waals Radius
245.00 pm  
13
200.00 pm  
35
Atomic Weight
257.00 amu  
15
52.00 amu  
99+
Atomic Volume
18.00 cm3/mol  
99+
7.23 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Einsteinium
  
Vanadium
  
Next Element
Mendelevium
  
Manganese
  
Valence Electron Potential
0.00 (-eV)  
99+
170.00 (-eV)  
4
Lattice Constant
350.00 pm  
99+
291.00 pm  
99+
Lattice Angles
-  
π/2, π/2, π/2  
Lattice C/A Ratio
1.63  
13
1.86  
4
Mechanical
Density
  
  
Density At Room Temperature
9.70 g/cm3  
99+
7.19 g/cm3  
99+
Density When Liquid (at m.p.)
9.70 g/cm3  
99+
6.30 g/cm3  
99+
Tensile Strength
0.10 MPa  
99+
689.00 MPa  
7
Viscosity
0.00  
25
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
26
Vapor Pressure at 2000 K
0.00 (Pa)  
30
774.00 (Pa)  
1
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
115.00 GPa  
9
Bulk Modulus
50.00 GPa  
24
160.00 GPa  
11
Young's Modulus
0.00 GPa  
99+
279.00 GPa  
8
Poisson Ratio
0.35  
9
0.21  
33
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.70  
99+
7.19  
99+
Magnetic Ordering
-  
Antiferromagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
10
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
7.90 nΩ·m  
99+
125.00 nΩ·m  
27
Electrical Conductivity
0.00 106/cm Ω  
99+
0.08 106/cm Ω  
30
Electron Affinity
0.00 kJ/mol  
99+
64.30 kJ/mol  
17
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.45 J/(kg K)  
12
Molar Heat Capacity
27.00 J/mol·K  
29
23.35 J/mol·K  
99+
Thermal Conductivity
0.00 W/m·K  
99+
93.90 W/m·K  
17
Critical Temperature
1,323.00 K  
99+
1,907.00 K  
24
Thermal Expansion
11.00 µm/(m·K)  
99+
4.90 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
319.20 kJ/mol  
99+
348.80 kJ/mol  
35
Enthalpy of Fusion
13.30 kJ/mol  
30
15.31 kJ/mol  
20
Enthalpy of Atomization
-  
397.50 kJ/mol  
27
Standard Molar Entropy
50.00 J/mol.K  
99+
23.80 J/mol.K  
99+
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