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Darmstadtium vs Mendelevium

Darmstadtium
Mendelevium
Mendelevium vs Darmstadtium


Periodic Table
Symbol
Ds  
Md  
Group Number
10  
8
3  
15
Period Number
7  
7  
Block
d block  
f block  
Element Family
Probably Transition  
Actinide  
CAS Number
54083771  
8
7440111  
99+
Space Group Name
-  
-  
Space Group Number
166.00  
9
194.00  
7
Facts
Interesting Facts
Darmstadtium is a synthetic element that is highly radioactive.  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Synthetically Produced  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
Gesellschaft für Schwerionenforschung  
Lawrence Berkeley National Laboratory  
Discovery
In 1994  
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 Darmstadtium metal are limited to research purpose only. As only few atoms of this metal are produced.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
-  
-  
Medical Uses
-  
-  
Other Uses
Research Purposes  
-  
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
6.00  
6
-  
Brinell Hardness
350.00 MPa  
36
350.00 MPa  
36
Vickers Hardness
500.00 MPa  
35
0.00 MPa  
99+
Speed of Sound
5,090.00 m/s  
13
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
50.00 %  
31
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ds  
Md  
Isotopes
  
  
Known Isotopes
9  
29
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
1.30  
33
Sanderson Electronegativity
1.30  
25
1.30  
25
Allred Rochow Electronegativity
1.10  
31
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
955.20 kJ/mol  
5
635.00 kJ/mol  
99+
2nd Energy Level
1,891.10 kJ/mol  
16
1,235.00 kJ/mol  
99+
3rd Energy Level
3,029.60 kJ/mol  
25
2,470.00 kJ/mol  
99+
4th Energy Level
3,955.90 kJ/mol  
99+
3,840.00 kJ/mol  
99+
5th Energy Level
5,113.70 kJ/mol  
99+
6,350.00 kJ/mol  
36
6th Energy Level
10,700.00 kJ/mol  
12
6,350.00 kJ/mol  
99+
7th Energy level
3,540.00 kJ/mol  
99+
6,350.00 kJ/mol  
99+
8th Energy Level
6,630.00 kJ/mol  
40
6,350.00 kJ/mol  
99+
9th Energy Level
7,180.00 kJ/mol  
29
6,350.00 kJ/mol  
99+
10th Energy Level
10,700.00 kJ/mol  
20
6,350.00 kJ/mol  
99+
11th Energy Level
3,540.00 kJ/mol  
99+
6,400.00 kJ/mol  
99+
12th Energy Level
34,800.00 kJ/mol  
28
60,100.00 kJ/mol  
16
13th Energy Level
5,280.00 kJ/mol  
99+
6,350.00 kJ/mol  
37
14th Energy Level
1,130.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
15th Energy Level
34,400.00 kJ/mol  
99+
63,500.00 kJ/mol  
37
16th Energy Level
34,800.00 kJ/mol  
99+
635.00 kJ/mol  
99+
17th Energy Level
1,139.00 kJ/mol  
18
1,107.00 kJ/mol  
21
18th Energy Level
1,080.00 kJ/mol  
99+
6,350.00 kJ/mol  
39
19th Energy Level
1,139.90 kJ/mol  
15
635.00 kJ/mol  
99+
20th Energy Level
0.00 kJ/mol  
99+
635.00 kJ/mol  
40
21st Energy Level
1,080.00 kJ/mol  
32
6,350.00 kJ/mol  
13
22nd Energy Level
350.00 kJ/mol  
99+
635.00 kJ/mol  
34
23rd Energy Level
1,100.00 kJ/mol  
35
6,350.00 kJ/mol  
13
24th Energy Level
565.80 kJ/mol  
99+
635.00 kJ/mol  
36
25th Energy Level
0.00 kJ/mol  
99+
635.00 kJ/mol  
38
26th Energy Level
582.30 kJ/mol  
99+
635.00 kJ/mol  
37
27th Energy Level
0.00 kJ/mol  
99+
635.00 kJ/mol  
39
28th Energy Level
1,130.00 kJ/mol  
4
635.00 kJ/mol  
99+
29th Energy Level
1,130.00 kJ/mol  
4
635.00 kJ/mol  
99+
30th Energy Level
663.20 kJ/mol  
33
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
110  
8
101  
17
Electron Configuration
[Rn] 5f14 6d8 7s2  
[Rn] 5f13 7s2  
Crystal Structure
Body Centered Cubic (BCC)  
Not Known  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
110  
8
101  
17
Number of Neutrons
161  
4
157  
8
Number of Electrons
110  
8
101  
17
Radius of an Atom
  
  
Atomic Radius
132.00 pm  
99+
175.00 pm  
21
Covalent Radius
128.00 pm  
99+
175.00 pm  
25
Van der Waals Radius
0.00 pm  
99+
246.00 pm  
12
Atomic Weight
281.00 amu  
6
258.00 amu  
14
Atomic Volume
20.50 cm3/mol  
29
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Meitnerium
  
Fermium
  
Next Element
Roentgenium
  
Nobelium
  
Valence Electron Potential
0.00 (-eV)  
99+
63.70 (-eV)  
23
Lattice Constant
0.00 pm  
99+
-  
Lattice Angles
-  
-  
Lattice C/A Ratio
1.61  
19
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
35.00 g/cm3  
4
10.30 g/cm3  
38
Density When Liquid (at m.p.)
34.80 g/cm3  
5
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)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
33.00 GPa  
23
32.00 GPa  
24
Bulk Modulus
38.00 GPa  
99+
0.00 GPa  
99+
Young's Modulus
0.00 GPa  
99+
12.00 GPa  
99+
Poisson Ratio
0.25  
24
0.30  
14
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
34.80  
7
13.50  
29
Magnetic Ordering
-  
-  
Permeability
0.00 H/m  
17
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
8.30 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
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.10 J/(kg K)  
99+
Molar Heat Capacity
27.30 J/mol·K  
23
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
12.90 µm/(m·K)  
38
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
348.90 kJ/mol  
34
380.50 kJ/mol  
26
Enthalpy of Fusion
-  
-  
Enthalpy of Atomization
-  
410.80 kJ/mol  
25
Standard Molar Entropy
57.00 J/mol.K  
30
37.40 J/mol.K  
99+
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