Mendelevium Lawrencium Comparison
Periodic Table
Symbol
Md
Lr
Group Number
Not Available
Not Available
Period Number
7
7
Block
f block
d block
Element Family
Actinide
Actinide
CAS Number
7440111
99+
22537195
15
Space Group Name
Not Available
Not Available
Space Group Number
Not Available
Not Available
Facts
Interesting Facts
- Mendelevium metal is synthetically produced metal.
- Mendelevium metal has been produced in only trace amount.
- It is synthetically produced metal.
- Radiation hazard can be produce by it.
Sources
Bombarding Einsteinium with Helium Ions
Bombarding Californium-252 with Boron Nuclei, Found in Minerals, Mining
History
Who Discovered
Lawrence Berkeley National Laboratory
Lawrence Berkeley National Laboratory and Joint Institute for Nuclear Research
Discovery
In 1955
In 1961–1971
Abundance
Uses
Uses & Benefits
- Currently known uses of Mendelevium metal are limited to research purpose only.
- Currently known uses of Lawrencium metal are limited to research purpose only.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
NA
NA
Biological Properties
Present in Human Body
No
No
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
37
In Bone
0.00 p.p.m.
36
0.00 p.p.m.
36
Physical Properties
Melting Point
827.00 °C
99+
1,627.00 °C
20
Boiling Point
Not Available
Not Available
Appearance
Physical State
Solid
Solid
Color
Unknown
Silver
Luster
Metallic
Unknown Luster
Hardness
Speed of Sound
Not Available
Not Available
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
Lr
Isotopes
Known Isotopes
16
23
10
28
Electronegativity
Pauling Electronegativity
1.30
32
Not Available
Allred Rochow Electronegativity
1.20
27
Not Available
Electropositivity
Pauling Electropositivity
2.70
22
Not Available
Ionization Energies
1st Energy Level
635.00 kJ/mol
99+
470.00 kJ/mol
99+
2nd Energy Level
1,235.00 kJ/mol
99+
1,428.00 kJ/mol
99+
3rd Energy Level
2,470.00 kJ/mol
99+
2,228.00 kJ/mol
99+
4th Energy Level
3,840.00 kJ/mol
99+
4,910.00 kJ/mol
21
Electrochemical Equivalent
3.21 g/amp-hr
12
3.23 g/amp-hr
11
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes
Atomic Properties
Atomic Number
101
17
103
15
Electron Configuration
[Rn] 5f13 7s2
[Rn] 5f14 7s2 7p1
Crystal Structure
Not Known
Hexagonal Close Packed (HCP)
Crystal Lattice
Unknown-Crystal-Structure-of-Mendelevium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
101
17
103
15
Number of Neutrons
157
7
157
7
Number of Electrons
101
17
103
15
Radius of an Atom
Van der Waals Radius
246.00 pm
8
246.00 pm
8
Atomic Weight
258.00 amu
14
266.00 amu
12
Atomic Volume
Not Available
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
Not Available
Not Available
Lattice Constant
Not Available
Not Available
Lattice Angles
NA
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
0.32
12
Other Mechanical Properties
Unknown
Unknown
Magnetic Properties
Magnetic Characteristics
Electrical Properties
Thermal Properties
Specific Heat
Not Available
Not Available
Molar Heat Capacity
Not Available
Not Available
Thermal Conductivity
Not Available
Not Available
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Standard Molar Entropy
Not Available
Not Available
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