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Meitnerium vs Mendelevium

Meitnerium
Mendelevium
Mendelevium vs Meitnerium


Periodic Table
Symbol
Mt  
Md  
Group Number
9  
9
3  
15
Period Number
7  
7  
Block
d block  
f block  
Element Family
Probably Transition  
Actinide  
CAS Number
54038016  
10
7440111  
99+
Space Group Name
-  
-  
Space Group Number
166.00  
9
194.00  
7
Facts
Interesting Facts
Meitnerium is named after Lise Meitner, an Austrian physicist.  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Bombarding Bi209 with Accelerated Nuclei of Fe58, Synthetically Produced  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
Gesellschaft für Schwerionenforschung  
Lawrence Berkeley National Laboratory  
Discovery
In 1982  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
40
Abundance In Sun
-  
-  
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
-  
-  
Abundance In Oceans
-  
-  
Abundance In Humans
-  
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Meitnerium 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
-  
827.00 °C  
99+
Boiling Point
0.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
-  
Luster
Unknown Luster  
Metallic  
Hardness
  
  
Mohs Hardness
-  
-  
Brinell Hardness
400.00 MPa  
34
350.00 MPa  
36
Vickers Hardness
350.00 MPa  
99+
0.00 MPa  
99+
Speed of Sound
3,200.00 m/s  
35
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
68.00 %  
15
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Mt  
Md  
Isotopes
  
  
Known Isotopes
4  
33
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.30  
33
Sanderson Electronegativity
1.90  
13
1.30  
25
Allred Rochow Electronegativity
1.30  
25
1.20  
28
Mulliken-Jaffe Electronegativity
1.30  
33
1.30  
33
Allen Electronegativity
1.30  
40
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
800.80 kJ/mol  
15
635.00 kJ/mol  
99+
2nd Energy Level
1,823.60 kJ/mol  
18
1,235.00 kJ/mol  
99+
3rd Energy Level
2,904.20 kJ/mol  
31
2,470.00 kJ/mol  
99+
4th Energy Level
3,859.40 kJ/mol  
99+
3,840.00 kJ/mol  
99+
5th Energy Level
4,920.80 kJ/mol  
99+
6,350.00 kJ/mol  
36
6th Energy Level
8,000.00 kJ/mol  
34
6,350.00 kJ/mol  
99+
7th Energy level
8,000.00 kJ/mol  
28
6,350.00 kJ/mol  
99+
8th Energy Level
8,000.00 kJ/mol  
28
6,350.00 kJ/mol  
99+
9th Energy Level
6,700.00 kJ/mol  
36
6,350.00 kJ/mol  
99+
10th Energy Level
5,800.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
11th Energy Level
6,300.00 kJ/mol  
99+
6,400.00 kJ/mol  
99+
12th Energy Level
0.00 kJ/mol  
99+
60,100.00 kJ/mol  
16
13th Energy Level
8,000.00 kJ/mol  
20
6,350.00 kJ/mol  
37
14th Energy Level
1,156.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
15th Energy Level
80,000.00 kJ/mol  
17
63,500.00 kJ/mol  
37
16th Energy Level
58,700.00 kJ/mol  
39
635.00 kJ/mol  
99+
17th Energy Level
1,110.00 kJ/mol  
20
1,107.00 kJ/mol  
21
18th Energy Level
8,000.00 kJ/mol  
23
6,350.00 kJ/mol  
39
19th Energy Level
1,110.00 kJ/mol  
17
635.00 kJ/mol  
99+
20th Energy Level
850.00 kJ/mol  
18
635.00 kJ/mol  
40
21st Energy Level
800.00 kJ/mol  
99+
6,350.00 kJ/mol  
13
22nd Energy Level
380.00 kJ/mol  
99+
635.00 kJ/mol  
34
23rd Energy Level
8,000.00 kJ/mol  
9
6,350.00 kJ/mol  
13
24th Energy Level
565.60 kJ/mol  
99+
635.00 kJ/mol  
36
25th Energy Level
800.00 kJ/mol  
13
635.00 kJ/mol  
38
26th Energy Level
800.00 kJ/mol  
13
635.00 kJ/mol  
37
27th Energy Level
800.00 kJ/mol  
12
635.00 kJ/mol  
39
28th Energy Level
800.00 kJ/mol  
18
635.00 kJ/mol  
99+
29th Energy Level
800.00 kJ/mol  
18
635.00 kJ/mol  
99+
30th Energy Level
800.00 kJ/mol  
13
635.00 kJ/mol  
40
Electrochemical Equivalent
3.00 g/amp-hr  
21
3.21 g/amp-hr  
13
Electron Work Function
4.90 eV  
12
3.89 eV  
37
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
109  
9
101  
17
Electron Configuration
[Rn] 5f14 6d7 7s2  
[Rn] 5f13 7s2  
Crystal Structure
Face Centered Cubic (FCC)  
Not Known  
Crystal Lattice
FCC-Crystal-Structure-of-Meitnerium.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
109  
9
101  
17
Number of Neutrons
157  
8
157  
8
Number of Electrons
109  
9
101  
17
Radius of an Atom
  
  
Atomic Radius
122.00 pm  
99+
175.00 pm  
21
Covalent Radius
129.00 pm  
99+
175.00 pm  
25
Van der Waals Radius
260.00 pm  
9
246.00 pm  
12
Atomic Weight
278.00 amu  
7
258.00 amu  
14
Atomic Volume
20.20 cm3/mol  
30
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Hassium
  
Fermium
  
Next Element
Darmstadtium
  
Nobelium
  
Valence Electron Potential
31.20 (-eV)  
99+
63.70 (-eV)  
23
Lattice Constant
0.00 pm  
99+
-  
Lattice Angles
-  
-  
Lattice C/A Ratio
1.59  
27
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
37.40 g/cm3  
2
10.30 g/cm3  
38
Density When Liquid (at m.p.)
37.40 g/cm3  
2
10.30 g/cm3  
39
Tensile Strength
80.00 MPa  
29
80.00 MPa  
29
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
35.00 GPa  
21
32.00 GPa  
24
Bulk Modulus
0.00 GPa  
99+
0.00 GPa  
99+
Young's Modulus
13.50 GPa  
99+
12.00 GPa  
99+
Poisson Ratio
0.25  
24
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
37.40  
4
13.50  
29
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
12
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
0.35 nΩ·m  
99+
0.63 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
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
10.30 µm/(m·K)  
99+
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
110.00 kJ/mol  
99+
380.50 kJ/mol  
26
Enthalpy of Fusion
-  
-  
Enthalpy of Atomization
350.20 kJ/mol  
37
410.80 kJ/mol  
25
Standard Molar Entropy
63.80 J/mol.K  
22
37.40 J/mol.K  
99+
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