Home
 Compare Metals

Cesium vs Fermium

Cesium
Fermium
Fermium vs Cesium


Periodic Table
Symbol
Cs  
Fm  
Group Number
1  
17
3  
15
Period Number
6  
7  
Block
s block  
f block  
Element Family
Alkali  
Actinide  
CAS Number
7440462  
40
7440724  
19
Space Group Name
Im_ 3m  
-  
Space Group Number
229.00  
2
194.00  
7
Facts
Interesting Facts
Cesium is the most alkaline metal and is used in atomic clocks.  
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
  
Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals  
Bombarding Pu-239 with Neutrons  
History
  
  
Who Discovered
Robert Bunsen and Gustav Kirchhoff  
Lawrence Berkeley National Laboratory  
Discovery
In 1860  
In 1952  
Abundance
  
  
Abundance In Universe
0.00 %  
25
0.00 %  
35
Abundance In Sun
0.00 %  
20
0.00 %  
30
Abundance In Meteorites
0.00 %  
38
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
35
0.00 %  
99+
Abundance In Oceans
0.00 %  
17
-  
Abundance In Humans
0.00 %  
20
-  
Uses
Uses & Benefits
  • The most common use of cesium metal is as a drilling fluid. It is also used in optical glass manufacturing.
  • In vacuum tubes and radiation monitor equipment this metal is used as a catalyst promoter.
  
  • Currently known uses of Fermium metal are limited to research purpose only.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Mildly Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
28
0.00 Blood/mg dm-3  
40
In Bone
0.05 p.p.m.  
31
0.00 p.p.m.  
99+
Physical
Melting Point
28.50 °C  
99+
1,527.00 °C  
26
Boiling Point
678.40 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Gold  
-  
Luster
-  
-  
Hardness
  
  
Mohs Hardness
0.20  
27
6.00  
6
Brinell Hardness
0.14 MPa  
99+
500.00 MPa  
28
Vickers Hardness
0.14 MPa  
99+
600.00 MPa  
28
Speed of Sound
1,630.00 m/s  
99+
2,500.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.93  
17
1.30  
99+
Reflectivity
35.00 %  
34
59.00 %  
24
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cs  
Fm  
Isotopes
  
  
Known Isotopes
36  
3
18  
21
Electronegativity
  
  
Pauling Electronegativity
0.79  
99+
1.30  
33
Sanderson Electronegativity
0.22  
99+
1.30  
25
Allred Rochow Electronegativity
0.86  
99+
1.20  
28
Mulliken-Jaffe Electronegativity
0.62  
99+
1.30  
33
Allen Electronegativity
0.66  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
3.21  
2
2.70  
22
Ionization Energies
  
  
1st Energy Level
375.70 kJ/mol  
99+
627.00 kJ/mol  
99+
2nd Energy Level
2,234.30 kJ/mol  
8
1,225.00 kJ/mol  
99+
3rd Energy Level
3,400.00 kJ/mol  
16
2,363.00 kJ/mol  
99+
4th Energy Level
375.70 kJ/mol  
99+
3,792.00 kJ/mol  
99+
5th Energy Level
3,750.00 kJ/mol  
99+
6,270.00 kJ/mol  
39
6th Energy Level
3,750.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
7th Energy level
3,750.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
8th Energy Level
3,760.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
9th Energy Level
3,750.00 kJ/mol  
99+
7,040.00 kJ/mol  
33
10th Energy Level
3,757.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
11th Energy Level
3,757.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
12th Energy Level
3,750.00 kJ/mol  
99+
62,700.00 kJ/mol  
10
13th Energy Level
3,750.00 kJ/mol  
99+
6,270.00 kJ/mol  
38
14th Energy Level
3,750.00 kJ/mol  
99+
6,270.00 kJ/mol  
27
15th Energy Level
37,500.00 kJ/mol  
99+
62,700.00 kJ/mol  
38
16th Energy Level
375.70 kJ/mol  
99+
62,700.00 kJ/mol  
28
17th Energy Level
375.70 kJ/mol  
99+
627.00 kJ/mol  
99+
18th Energy Level
3,757.00 kJ/mol  
99+
6,270.00 kJ/mol  
40
19th Energy Level
375.70 kJ/mol  
99+
994.80 kJ/mol  
21
20th Energy Level
375.00 kJ/mol  
99+
627.00 kJ/mol  
99+
21st Energy Level
375.70 kJ/mol  
99+
627.00 kJ/mol  
99+
22nd Energy Level
375.00 kJ/mol  
99+
345.00 kJ/mol  
99+
23rd Energy Level
375.70 kJ/mol  
99+
6,270.00 kJ/mol  
14
24th Energy Level
375.70 kJ/mol  
99+
627.60 kJ/mol  
38
25th Energy Level
375.70 kJ/mol  
99+
627.00 kJ/mol  
40
26th Energy Level
375.70 kJ/mol  
99+
627.60 kJ/mol  
39
27th Energy Level
375.70 kJ/mol  
99+
627.60 kJ/mol  
99+
28th Energy Level
375.70 kJ/mol  
99+
627.60 kJ/mol  
99+
29th Energy Level
375.70 kJ/mol  
99+
627.60 kJ/mol  
99+
30th Energy Level
375.70 kJ/mol  
99+
627.60 kJ/mol  
99+
Electrochemical Equivalent
4.96 g/amp-hr  
3
3.20 g/amp-hr  
15
Electron Work Function
2.14 eV  
99+
4.47 eV  
21
Other Chemical Properties
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
55  
99+
100  
18
Electron Configuration
[Xe] 6s1  
[Rn] 5f12 7s2  
Crystal Structure
Body Centered Cubic (BCC)  
Not Known  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
Unknown-Crystal-Structure-of-Fermium.jpg#100  
Atom
  
  
Number of Protons
55  
99+
100  
18
Number of Neutrons
78  
99+
157  
8
Number of Electrons
55  
99+
100  
18
Radius of an Atom
  
  
Atomic Radius
265.00 pm  
2
180.00 pm  
16
Covalent Radius
244.00 pm  
2
180.00 pm  
23
Van der Waals Radius
343.00 pm  
2
245.00 pm  
13
Atomic Weight
132.91 amu  
99+
257.00 amu  
15
Atomic Volume
71.07 cm3/mol  
1
18.00 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Tin
  
Einsteinium
  
Next Element
Barium
  
Mendelevium
  
Valence Electron Potential
8.62 (-eV)  
99+
0.00 (-eV)  
99+
Lattice Constant
614.10 pm  
5
350.00 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.87  
3
1.63  
13
Mechanical
Density
  
  
Density At Room Temperature
1.93 g/cm3  
99+
9.70 g/cm3  
99+
Density When Liquid (at m.p.)
1.84 g/cm3  
99+
9.70 g/cm3  
99+
Tensile Strength
15.00 MPa  
99+
0.10 MPa  
99+
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
30.00 GPa  
27
Bulk Modulus
1.60 GPa  
99+
50.00 GPa  
24
Young's Modulus
1.70 GPa  
99+
0.00 GPa  
99+
Poisson Ratio
0.35  
9
0.35  
9
Other Mechanical Properties
Ductile  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
1.87  
99+
9.70  
99+
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
17
0.00 H/m  
16
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Semiconductor  
-  
Resistivity
205.00 nΩ·m  
17
7.90 nΩ·m  
99+
Electrical Conductivity
0.05 106/cm Ω  
40
0.00 106/cm Ω  
99+
Electron Affinity
45.50 kJ/mol  
30
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.24 J/(kg K)  
23
0.10 J/(kg K)  
99+
Molar Heat Capacity
32.21 J/mol·K  
6
27.00 J/mol·K  
29
Thermal Conductivity
35.90 W/m·K  
37
0.00 W/m·K  
99+
Critical Temperature
1,938.00 K  
22
1,323.00 K  
99+
Thermal Expansion
97.00 µm/(m·K)  
1
11.00 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
65.90 kJ/mol  
99+
319.20 kJ/mol  
99+
Enthalpy of Fusion
2.10 kJ/mol  
99+
13.30 kJ/mol  
30
Enthalpy of Atomization
78.20 kJ/mol  
99+
-  
Standard Molar Entropy
85.20 J/mol.K  
3
50.00 J/mol.K  
99+
Periodic Table >>
<< All

Compare Alkali Metals

Alkali Metals

Alkali Metals

» More Alkali Metals

Compare Alkali Metals

» More Compare Alkali Metals
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!