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Ytterbium vs Fermium

Ytterbium
Fermium
Fermium vs Ytterbium


Periodic Table
Symbol
Yb  
Fm  
Group Number
3  
15
3  
15
Period Number
6  
7  
Block
f block  
f block  
Element Family
Lanthanide  
Actinide  
CAS Number
7440644  
26
7440724  
19
Space Group Name
Fm_ 3m  
-  
Space Group Number
225.00  
3
194.00  
7
Facts
Interesting Facts
  • Ytterbium metal oxidizes rapidly if exposed to air.
  • Ytterbium metal can dissolve quickly in Mineral acid.
  
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Bombarding Pu-239 with Neutrons  
History
  
  
Who Discovered
Jean Charles Galissard de Marignac  
Lawrence Berkeley National Laboratory  
Discovery
In 1878  
In 1952  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
35
Abundance In Sun
0.00 %  
26
0.00 %  
30
Abundance In Meteorites
0.00 %  
36
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
33
0.00 %  
99+
Abundance In Oceans
0.00 %  
37
-  
Abundance In Humans
0.00 %  
24
-  
Uses
Uses & Benefits
  • Ytterbium metal is used in memory devices and tuneable laser.
  • It is also used as industrial catalyst as the other catalysts are too toxic and polluting.
  
  • Currently known uses of Fermium metal are limited to research purpose only.
  
Industrial Uses
Automobile Industry, Chemical Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Highly Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
2.10 p.p.m.  
15
0.00 p.p.m.  
99+
Physical
Melting Point
824.00 °C  
99+
1,527.00 °C  
26
Boiling Point
1,196.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
-  
Luster
Metallic  
-  
Hardness
  
  
Mohs Hardness
1.00  
22
6.00  
6
Brinell Hardness
343.00 MPa  
37
500.00 MPa  
28
Vickers Hardness
206.00 MPa  
99+
600.00 MPa  
28
Speed of Sound
1,590.00 m/s  
99+
2,500.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.60  
33
1.30  
99+
Reflectivity
30.00 %  
35
59.00 %  
24
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Yb  
Fm  
Isotopes
  
  
Known Isotopes
30  
9
18  
21
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
1.30  
33
Sanderson Electronegativity
1.10  
38
1.30  
25
Allred Rochow Electronegativity
1.06  
34
1.20  
28
Mulliken-Jaffe Electronegativity
1.10  
99+
1.30  
33
Allen Electronegativity
1.10  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.20  
39
2.70  
22
Ionization Energies
  
  
1st Energy Level
603.40 kJ/mol  
99+
627.00 kJ/mol  
99+
2nd Energy Level
1,174.80 kJ/mol  
99+
1,225.00 kJ/mol  
99+
3rd Energy Level
2,417.00 kJ/mol  
99+
2,363.00 kJ/mol  
99+
4th Energy Level
4,203.00 kJ/mol  
99+
3,792.00 kJ/mol  
99+
5th Energy Level
6,150.00 kJ/mol  
99+
6,270.00 kJ/mol  
39
6th Energy Level
6,030.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
7th Energy level
6,150.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
8th Energy Level
6,034.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
9th Energy Level
6,150.00 kJ/mol  
99+
7,040.00 kJ/mol  
33
10th Energy Level
6,150.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
11th Energy Level
6,150.00 kJ/mol  
99+
6,270.00 kJ/mol  
99+
12th Energy Level
6,030.00 kJ/mol  
99+
62,700.00 kJ/mol  
10
13th Energy Level
6,030.00 kJ/mol  
99+
6,270.00 kJ/mol  
38
14th Energy Level
6,030.00 kJ/mol  
31
6,270.00 kJ/mol  
27
15th Energy Level
60,300.00 kJ/mol  
99+
62,700.00 kJ/mol  
38
16th Energy Level
60,300.00 kJ/mol  
32
62,700.00 kJ/mol  
28
17th Energy Level
603.40 kJ/mol  
99+
627.00 kJ/mol  
99+
18th Energy Level
6,110.00 kJ/mol  
99+
6,270.00 kJ/mol  
40
19th Energy Level
603.00 kJ/mol  
99+
994.80 kJ/mol  
21
20th Energy Level
615.00 kJ/mol  
99+
627.00 kJ/mol  
99+
21st Energy Level
603.40 kJ/mol  
99+
627.00 kJ/mol  
99+
22nd Energy Level
603.00 kJ/mol  
99+
345.00 kJ/mol  
99+
23rd Energy Level
603.40 kJ/mol  
99+
6,270.00 kJ/mol  
14
24th Energy Level
603.40 kJ/mol  
99+
627.60 kJ/mol  
38
25th Energy Level
603.40 kJ/mol  
99+
627.00 kJ/mol  
40
26th Energy Level
603.40 kJ/mol  
99+
627.60 kJ/mol  
39
27th Energy Level
603.40 kJ/mol  
99+
627.60 kJ/mol  
99+
28th Energy Level
603.40 kJ/mol  
99+
627.60 kJ/mol  
99+
29th Energy Level
603.40 kJ/mol  
99+
627.60 kJ/mol  
99+
30th Energy Level
603.40 kJ/mol  
99+
627.60 kJ/mol  
99+
Electrochemical Equivalent
2.15 g/amp-hr  
29
3.20 g/amp-hr  
15
Electron Work Function
3.20 eV  
99+
4.47 eV  
21
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
70  
99+
100  
18
Electron Configuration
[Xe] 4f14 6s2  
[Rn] 5f12 7s2  
Crystal Structure
Face Centered Cubic (FCC)  
Not Known  
Crystal Lattice
FCC-Crystal-Structure-of-Ytterbium.jpg#100  
Unknown-Crystal-Structure-of-Fermium.jpg#100  
Atom
  
  
Number of Protons
70  
99+
100  
18
Number of Neutrons
103  
32
157  
8
Number of Electrons
70  
99+
100  
18
Radius of an Atom
  
  
Atomic Radius
176.00 pm  
20
180.00 pm  
16
Covalent Radius
187.00 pm  
20
180.00 pm  
23
Van der Waals Radius
242.00 pm  
16
245.00 pm  
13
Atomic Weight
173.05 amu  
99+
257.00 amu  
15
Atomic Volume
24.79 cm3/mol  
13
18.00 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Thulium
  
Einsteinium
  
Next Element
Lutetium
  
Mendelevium
  
Valence Electron Potential
50.30 (-eV)  
28
0.00 (-eV)  
99+
Lattice Constant
548.47 pm  
12
350.00 pm  
99+
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.61  
20
1.63  
13
Mechanical
Density
  
  
Density At Room Temperature
6.90 g/cm3  
99+
9.70 g/cm3  
99+
Density When Liquid (at m.p.)
6.21 g/cm3  
99+
9.70 g/cm3  
99+
Tensile Strength
58.00 MPa  
36
0.10 MPa  
99+
Viscosity
0.00  
20
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
9.90 GPa  
99+
30.00 GPa  
27
Bulk Modulus
30.50 GPa  
99+
50.00 GPa  
24
Young's Modulus
23.90 GPa  
99+
0.00 GPa  
99+
Poisson Ratio
0.21  
34
0.35  
9
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
6.97  
99+
9.70  
99+
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
13
0.00 H/m  
16
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
0.25 nΩ·m  
99+
7.90 nΩ·m  
99+
Electrical Conductivity
0.04 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.15 J/(kg K)  
37
0.10 J/(kg K)  
99+
Molar Heat Capacity
26.74 J/mol·K  
32
27.00 J/mol·K  
29
Thermal Conductivity
38.50 W/m·K  
35
0.00 W/m·K  
99+
Critical Temperature
26.30 K  
99+
1,323.00 K  
99+
Thermal Expansion
26.30 µm/(m·K)  
14
11.00 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
128.90 kJ/mol  
99+
319.20 kJ/mol  
99+
Enthalpy of Fusion
7.66 kJ/mol  
99+
13.30 kJ/mol  
30
Enthalpy of Atomization
180.00 kJ/mol  
99+
-  
Standard Molar Entropy
59.90 J/mol.K  
26
50.00 J/mol.K  
99+
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