Mendelevium vs Uranium
Periodic Table
Symbol
Md
U
Group Number
Not Available
0
18
Period Number
7
7
Block
f block
f block
Element Family
Actinide
Actinide
CAS Number
7440111
99+
7440611
28
Space Group Name
Not Available
Cmcm
Space Group Number
Not Available
63.00
10
Facts
Interesting Facts
- Mendelevium metal is synthetically produced metal.
- Mendelevium metal has been produced in only trace amount.
- Major mining countries of Uranium include Russia, Australia, Namibia, Canada and Niger and total 33% Uranium are mine in Kazakhstan.
Sources
Bombarding Einsteinium with Helium Ions
Earth's crust, Mining, Ores of Minerals
History
Who Discovered
Lawrence Berkeley National Laboratory
Not Available
Discovery
In 1955
In 1789
Abundance
Abundance In Universe
Not Available
2 * 10-8 %
29
Abundance In Sun
~-9999 %
~0.0000001 %
26
Abundance In Meteorites
Not Available
0.00 %
99+
Abundance In Earth's Crust
Not Available
0.00 %
36
Abundance In Oceans
Not Available
0.00 %
11
Uses
Uses & Benefits
- Currently known uses of Mendelevium metal are limited to research purpose only.
- The main use of this metal include nuclear fuel which is used to generate electricity yin nuclear power stations.
- Synthetic elements like transuranium are made from Uranium metal.
Industrial Uses
NA
Ammunition Industry, Chemical Industry
Medical Uses
NA
NA
Other Uses
NA
Alloys, Jewellery, Nuclear Reactor's Fuel, Sculptures, Statues
Biological Properties
Toxicity
Unknown
Toxic
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
Not Available
In Bone
0.00 p.p.m.
36
Not Available
Physical Properties
Melting Point
827.00 °C
99+
1,132.00 °C
39
Boiling Point
Not Available
3,818.00 °C
16
Appearance
Physical State
Solid
Solid
Color
Unknown
Silvery Gray
Luster
Metallic
Metallic
Hardness
Mohs Hardness
Not Available
6.00
6
Brinell Hardness
Not Available
2,350.00 MPa
2
Vickers Hardness
Not Available
1,960.00 MPa
2
Speed of Sound
Not Available
3,155.00 m/s
25
Optical Properties
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Md
U
Isotopes
Known Isotopes
16
23
25
14
Electronegativity
Pauling Electronegativity
1.30
32
1.38
28
Allred Rochow Electronegativity
1.20
27
1.22
26
Electropositivity
Pauling Electropositivity
2.70
22
2.62
26
Ionization Energies
1st Energy Level
635.00 kJ/mol
99+
597.60 kJ/mol
99+
2nd Energy Level
1,235.00 kJ/mol
99+
1,420.00 kJ/mol
99+
3rd Energy Level
2,470.00 kJ/mol
99+
1,900.00 kJ/mol
99+
4th Energy Level
3,840.00 kJ/mol
99+
3,145.00 kJ/mol
99+
Electrochemical Equivalent
3.21 g/amp-hr
12
1.48 g/amp-hr
99+
Electron Work Function
Not Available
3.63 eV
30
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
101
17
92
26
Electron Configuration
[Rn] 5f13 7s2
[Rn] 5f3 6d1 7s2
Crystal Structure
Not Known
Orthorhombic (ORTH)
Crystal Lattice
Unknown-Crystal-Structure-of-Mendelevium.jpg#100
ORTH-Crystal-Structure-of-Uranium.jpg#100
Atom
Number of Protons
101
17
92
26
Number of Neutrons
157
7
146
13
Number of Electrons
101
17
92
26
Radius of an Atom
Atomic Radius
Not Available
156.00 pm
29
Covalent Radius
Not Available
196.00 pm
14
Van der Waals Radius
246.00 pm
8
186.00 pm
33
Atomic Weight
258.00 amu
14
238.03 amu
21
Atomic Volume
Not Available
12.59 cm3/mol
40
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
170.00 (-eV)
4
Lattice Constant
Not Available
295.08 pm
99+
Lattice Angles
NA
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
Not Available
19.10 g/cm3
17
Density When Liquid (at m.p.)
Not Available
17.30 g/cm3
7
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
Not Available
0.01 (Pa)
20
Elasticity properties
Shear Modulus
Not Available
111.00 GPa
10
Bulk Modulus
Not Available
100.00 GPa
16
Young's Modulus
Not Available
208.00 GPa
10
Poisson Ratio
Not Available
0.23
30
Other Mechanical Properties
Unknown
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
Not Available
18.80
10
Magnetic Ordering
Unknown
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Poor Conductor
Resistivity
Not Available
0.28 nΩ·m
99+
Electrical Conductivity
Not Available
0.04 106/cm Ω
37
Thermal Properties
Specific Heat
Not Available
0.12 J/(kg K)
40
Molar Heat Capacity
Not Available
27.67 J/mol·K
15
Thermal Conductivity
Not Available
27.50 W/m·K
40
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
13.90 µm/(m·K)
27
Enthalpy
Enthalpy of Vaporization
Not Available
477.00 kJ/mol
13
Enthalpy of Fusion
Not Available
15.48 kJ/mol
19
Enthalpy of Atomization
Not Available
489.50 kJ/mol
14
Standard Molar Entropy
Not Available
50.20 J/mol.K
31
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