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Fermium Mendelevium Comparison

Fermium
Mendelevium
Mendelevium Fermium comparison


Periodic Table
Symbol
Fm  
Md  
Group Number
3  
15
3  
15
Period Number
7  
7  
Block
f block  
f block  
Element Family
Actinide  
Actinide  
CAS Number
7440724  
19
7440111  
99+
Space Group Name
-  
-  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Fermium metal is highly radioactive in nature.
  • Fermium is synthetically produced metal.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Bombarding Pu-239 with Neutrons  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
Lawrence Berkeley National Laboratory  
Discovery
In 1952  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
40
Abundance In Sun
0.00 %  
30
-  
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
-  
-  
Abundance In Humans
-  
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Fermium metal are limited to research purpose only.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
-  
-  
Biological Properties
  
  
Toxicity
-  
-  
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
827.00 °C  
99+
Boiling Point
0.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
-  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
-  
Brinell Hardness
500.00 MPa  
28
350.00 MPa  
36
Vickers Hardness
600.00 MPa  
28
0.00 MPa  
99+
Speed of Sound
2,500.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
59.00 %  
24
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Fm  
Md  
Isotopes
  
  
Known Isotopes
18  
21
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.30  
33
Sanderson Electronegativity
1.30  
25
1.30  
25
Allred Rochow Electronegativity
1.20  
28
1.20  
28
Mulliken-Jaffe Electronegativity
1.30  
33
1.30  
33
Allen Electronegativity
1.30  
40
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.70  
22
Ionization Energies
  
  
1st Energy Level
627.00 kJ/mol  
99+
635.00 kJ/mol  
99+
2nd Energy Level
1,225.00 kJ/mol  
99+
1,235.00 kJ/mol  
99+
3rd Energy Level
2,363.00 kJ/mol  
99+
2,470.00 kJ/mol  
99+
4th Energy Level
3,792.00 kJ/mol  
99+
3,840.00 kJ/mol  
99+
5th Energy Level
6,270.00 kJ/mol  
39
6,350.00 kJ/mol  
36
6th Energy Level
6,270.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
7th Energy level
6,270.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
8th Energy Level
6,270.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
9th Energy Level
7,040.00 kJ/mol  
33
6,350.00 kJ/mol  
99+
10th Energy Level
6,270.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
11th Energy Level
6,270.00 kJ/mol  
99+
6,400.00 kJ/mol  
99+
12th Energy Level
62,700.00 kJ/mol  
10
60,100.00 kJ/mol  
16
13th Energy Level
6,270.00 kJ/mol  
38
6,350.00 kJ/mol  
37
14th Energy Level
6,270.00 kJ/mol  
27
1,150.00 kJ/mol  
99+
15th Energy Level
62,700.00 kJ/mol  
38
63,500.00 kJ/mol  
37
16th Energy Level
62,700.00 kJ/mol  
28
635.00 kJ/mol  
99+
17th Energy Level
627.00 kJ/mol  
99+
1,107.00 kJ/mol  
21
18th Energy Level
6,270.00 kJ/mol  
40
6,350.00 kJ/mol  
39
19th Energy Level
994.80 kJ/mol  
21
635.00 kJ/mol  
99+
20th Energy Level
627.00 kJ/mol  
99+
635.00 kJ/mol  
40
21st Energy Level
627.00 kJ/mol  
99+
6,350.00 kJ/mol  
13
22nd Energy Level
345.00 kJ/mol  
99+
635.00 kJ/mol  
34
23rd Energy Level
6,270.00 kJ/mol  
14
6,350.00 kJ/mol  
13
24th Energy Level
627.60 kJ/mol  
38
635.00 kJ/mol  
36
25th Energy Level
627.00 kJ/mol  
40
635.00 kJ/mol  
38
26th Energy Level
627.60 kJ/mol  
39
635.00 kJ/mol  
37
27th Energy Level
627.60 kJ/mol  
99+
635.00 kJ/mol  
39
28th Energy Level
627.60 kJ/mol  
99+
635.00 kJ/mol  
99+
29th Energy Level
627.60 kJ/mol  
99+
635.00 kJ/mol  
99+
30th Energy Level
627.60 kJ/mol  
99+
635.00 kJ/mol  
40
Electrochemical Equivalent
3.20 g/amp-hr  
15
3.21 g/amp-hr  
13
Electron Work Function
4.47 eV  
21
3.89 eV  
37
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
100  
18
101  
17
Electron Configuration
[Rn] 5f12 7s2  
[Rn] 5f13 7s2  
Crystal Structure
Not Known  
Not Known  
Crystal Lattice
Unknown-Crystal-Structure-of-Fermium.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
100  
18
101  
17
Number of Neutrons
157  
8
157  
8
Number of Electrons
100  
18
101  
17
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
175.00 pm  
21
Covalent Radius
180.00 pm  
23
175.00 pm  
25
Van der Waals Radius
245.00 pm  
13
246.00 pm  
12
Atomic Weight
257.00 amu  
15
258.00 amu  
14
Atomic Volume
18.00 cm3/mol  
99+
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Einsteinium
  
Fermium
  
Next Element
Mendelevium
  
Nobelium
  
Valence Electron Potential
0.00 (-eV)  
99+
63.70 (-eV)  
23
Lattice Constant
350.00 pm  
99+
-  
Lattice Angles
-  
-  
Lattice C/A Ratio
1.63  
13
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
9.70 g/cm3  
99+
10.30 g/cm3  
38
Density When Liquid (at m.p.)
9.70 g/cm3  
99+
10.30 g/cm3  
39
Tensile Strength
0.10 MPa  
99+
80.00 MPa  
29
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
32.00 GPa  
24
Bulk Modulus
50.00 GPa  
24
0.00 GPa  
99+
Young's Modulus
0.00 GPa  
99+
12.00 GPa  
99+
Poisson Ratio
0.35  
9
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
9.70  
99+
13.50  
29
Magnetic Ordering
-  
-  
Permeability
0.00 H/m  
16
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
7.90 nΩ·m  
99+
0.63 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
50.00 kJ/mol  
26
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.10 J/(kg K)  
99+
Molar Heat Capacity
27.00 J/mol·K  
29
27.00 J/mol·K  
29
Thermal Conductivity
0.00 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
1,323.00 K  
99+
1,100.00 K  
99+
Thermal Expansion
11.00 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
319.20 kJ/mol  
99+
380.50 kJ/mol  
26
Enthalpy of Fusion
13.30 kJ/mol  
30
-  
Enthalpy of Atomization
-  
410.80 kJ/mol  
25
Standard Molar Entropy
50.00 J/mol.K  
99+
37.40 J/mol.K  
99+
Summary >>
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