Home
 Compare Metals

Fermium vs Erbium

Fermium
Erbium
Erbium vs Fermium


Periodic Table
Symbol
Fm  
Er  
Group Number
3  
15
3  
15
Period Number
7  
6  
Block
f block  
f block  
Element Family
Actinide  
Lanthanide  
CAS Number
7440724  
19
7440520  
35
Space Group Name
-  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
  
  • Erbium metal is used as alloyed with Vanadium to make it softer.
  • Recent studies shows that it is helpful for metabolism.
  
Sources
Bombarding Pu-239 with Neutrons  
Mining  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
Carl Gustaf Mosander  
Discovery
In 1952  
In 1842  
Abundance
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
23
Abundance In Sun
0.00 %  
30
0.00 %  
26
Abundance In Meteorites
0.00 %  
99+
0.00 %  
36
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
32
Abundance In Oceans
-  
0.00 %  
36
Abundance In Humans
-  
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Fermium metal are limited to research purpose only.
  
  • It has a tendency to get tarnished in the open air, but when alloyed with elements like erbium, vanadium, its hardness levels decreases.
  • Its compounds like Erbium oxide is used in safety glasses of welders and metal workers.
  
Industrial Uses
-  
Chemical Industry  
Medical Uses
-  
-  
Other Uses
-  
Alloys  
Biological Properties
  
  
Toxicity
-  
Mildly 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
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,527.00 °C  
26
1,522.00 °C  
28
Boiling Point
0.00 °C  
99+
2,510.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
Silvery White  
Luster
-  
Lustrous  
Hardness
  
  
Mohs Hardness
6.00  
6
1.00  
22
Brinell Hardness
500.00 MPa  
28
814.00 MPa  
12
Vickers Hardness
600.00 MPa  
28
589.00 MPa  
30
Speed of Sound
2,500.00 m/s  
99+
2,830.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.76  
24
Reflectivity
59.00 %  
24
36.00 %  
33
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Fm  
Er  
Isotopes
  
  
Known Isotopes
18  
21
31  
8
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.24  
37
Sanderson Electronegativity
1.30  
25
1.24  
29
Allred Rochow Electronegativity
1.20  
28
1.11  
30
Mulliken-Jaffe Electronegativity
1.30  
33
1.24  
36
Allen Electronegativity
1.30  
40
1.24  
99+
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.76  
18
Ionization Energies
  
  
1st Energy Level
627.00 kJ/mol  
99+
589.30 kJ/mol  
99+
2nd Energy Level
1,225.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
3rd Energy Level
2,363.00 kJ/mol  
99+
2,194.00 kJ/mol  
99+
4th Energy Level
3,792.00 kJ/mol  
99+
4,120.00 kJ/mol  
99+
5th Energy Level
6,270.00 kJ/mol  
39
5,897.00 kJ/mol  
99+
6th Energy Level
6,270.00 kJ/mol  
99+
5,897.00 kJ/mol  
99+
7th Energy level
6,270.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
8th Energy Level
6,270.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
9th Energy Level
7,040.00 kJ/mol  
33
4,240.00 kJ/mol  
99+
10th Energy Level
6,270.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
11th Energy Level
6,270.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
12th Energy Level
62,700.00 kJ/mol  
10
5,890.00 kJ/mol  
99+
13th Energy Level
6,270.00 kJ/mol  
38
5,890.00 kJ/mol  
99+
14th Energy Level
6,270.00 kJ/mol  
27
5,890.00 kJ/mol  
37
15th Energy Level
62,700.00 kJ/mol  
38
58,900.00 kJ/mol  
99+
16th Energy Level
62,700.00 kJ/mol  
28
58,900.00 kJ/mol  
38
17th Energy Level
627.00 kJ/mol  
99+
589.30 kJ/mol  
99+
18th Energy Level
6,270.00 kJ/mol  
40
5,890.00 kJ/mol  
99+
19th Energy Level
994.80 kJ/mol  
21
589.30 kJ/mol  
99+
20th Energy Level
627.00 kJ/mol  
99+
589.00 kJ/mol  
99+
21st Energy Level
627.00 kJ/mol  
99+
5,897.00 kJ/mol  
19
22nd Energy Level
345.00 kJ/mol  
99+
589.00 kJ/mol  
99+
23rd Energy Level
6,270.00 kJ/mol  
14
589.30 kJ/mol  
99+
24th Energy Level
627.60 kJ/mol  
38
589.30 kJ/mol  
99+
25th Energy Level
627.00 kJ/mol  
40
589.00 kJ/mol  
99+
26th Energy Level
627.60 kJ/mol  
39
589.30 kJ/mol  
99+
27th Energy Level
627.60 kJ/mol  
99+
589.30 kJ/mol  
99+
28th Energy Level
627.60 kJ/mol  
99+
589.30 kJ/mol  
99+
29th Energy Level
627.60 kJ/mol  
99+
589.30 kJ/mol  
99+
30th Energy Level
627.60 kJ/mol  
99+
589.70 kJ/mol  
99+
Electrochemical Equivalent
3.20 g/amp-hr  
15
2.08 g/amp-hr  
32
Electron Work Function
4.47 eV  
21
5.93 eV  
2
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
100  
18
68  
99+
Electron Configuration
[Rn] 5f12 7s2  
[Xe] 4f12 6s2  
Crystal Structure
Not Known  
Hexagonal Close Packed (HCP)  
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100  
HCP-Crystal-Structure-of-Erbium.jpg#100  
Atom
  
  
Number of Protons
100  
18
68  
99+
Number of Neutrons
157  
8
99  
34
Number of Electrons
100  
18
68  
99+
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
176.00 pm  
20
Covalent Radius
180.00 pm  
23
189.00 pm  
19
Van der Waals Radius
245.00 pm  
13
0.00 pm  
99+
Atomic Weight
257.00 amu  
15
167.26 amu  
99+
Atomic Volume
18.00 cm3/mol  
99+
18.40 cm3/mol  
37
Adjacent Atomic Numbers
  
  
Previous Element
Einsteinium
  
Holmium
  
Next Element
Mendelevium
  
Thulium
  
Valence Electron Potential
0.00 (-eV)  
99+
49.00 (-eV)  
30
Lattice Constant
350.00 pm  
99+
355.88 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.63  
13
1.57  
40
Mechanical
Density
  
  
Density At Room Temperature
9.70 g/cm3  
99+
9.07 g/cm3  
99+
Density When Liquid (at m.p.)
9.70 g/cm3  
99+
8.86 g/cm3  
99+
Tensile Strength
0.10 MPa  
99+
350.00 MPa  
12
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
21
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
28.30 GPa  
31
Bulk Modulus
50.00 GPa  
24
44.40 GPa  
31
Young's Modulus
0.00 GPa  
99+
69.90 GPa  
31
Poisson Ratio
0.35  
9
0.24  
28
Other Mechanical Properties
-  
Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.70  
99+
9.07  
99+
Magnetic Ordering
-  
Paramagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
11
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
7.90 nΩ·m  
99+
0.86 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.01 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
50.00 kJ/mol  
26
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.17 J/(kg K)  
35
Molar Heat Capacity
27.00 J/mol·K  
29
28.12 J/mol·K  
14
Thermal Conductivity
0.00 W/m·K  
99+
14.50 W/m·K  
99+
Critical Temperature
1,323.00 K  
99+
1,802.00 K  
30
Thermal Expansion
11.00 µm/(m·K)  
99+
12.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
319.20 kJ/mol  
99+
261.00 kJ/mol  
99+
Enthalpy of Fusion
13.30 kJ/mol  
30
17.20 kJ/mol  
15
Enthalpy of Atomization
-  
314.00 kJ/mol  
99+
Standard Molar Entropy
50.00 J/mol.K  
99+
73.10 J/mol.K  
11
Periodic Table >>
<< All

Compare Actinide Series

Actinide Series

Actinide Series

» More Actinide Series

Compare Actinide Series

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