Lawrencium vs Mendelevium
Periodic Table
Symbol
Lr
Md
Group Number
Not Available
Not Available
Period Number
7
7
Block
d block
f block
Element Family
Actinide
Actinide
CAS Number
22537195
15
7440111
99+
Space Group Name
Not Available
Not Available
Space Group Number
Not Available
Not Available
Facts
Interesting Facts
- It is synthetically produced metal.
- Radiation hazard can be produce by it.
- Mendelevium metal is synthetically produced metal.
- Mendelevium metal has been produced in only trace amount.
Sources
Bombarding Californium-252 with Boron Nuclei, Found in Minerals, Mining
Bombarding Einsteinium with Helium Ions
History
Who Discovered
Lawrence Berkeley National Laboratory and Joint Institute for Nuclear Research
Lawrence Berkeley National Laboratory
Discovery
In 1961–1971
In 1955
Abundance
Uses
Uses & Benefits
- Currently known uses of Lawrencium metal are limited to research purpose only.
- Currently known uses of Mendelevium 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
1,627.00 °C
20
827.00 °C
99+
Boiling Point
Not Available
Not Available
Appearance
Physical State
Solid
Solid
Color
Silver
Unknown
Luster
Unknown Luster
Metallic
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
Lr
Md
Isotopes
Known Isotopes
10
28
16
23
Electronegativity
Pauling Electronegativity
Not Available
1.30
32
Allred Rochow Electronegativity
Not Available
1.20
27
Electropositivity
Pauling Electropositivity
Not Available
2.70
22
Ionization Energies
1st Energy Level
470.00 kJ/mol
99+
635.00 kJ/mol
99+
2nd Energy Level
1,428.00 kJ/mol
99+
1,235.00 kJ/mol
99+
3rd Energy Level
2,228.00 kJ/mol
99+
2,470.00 kJ/mol
99+
4th Energy Level
4,910.00 kJ/mol
21
3,840.00 kJ/mol
99+
Electrochemical Equivalent
3.23 g/amp-hr
11
3.21 g/amp-hr
12
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
103
15
101
17
Electron Configuration
[Rn] 5f14 7s2 7p1
[Rn] 5f13 7s2
Crystal Structure
Hexagonal Close Packed (HCP)
Not Known
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
Unknown-Crystal-Structure-of-Mendelevium.jpg#100
Atom
Number of Protons
103
15
101
17
Number of Neutrons
157
7
157
7
Number of Electrons
103
15
101
17
Radius of an Atom
Van der Waals Radius
246.00 pm
8
246.00 pm
8
Atomic Weight
266.00 amu
12
258.00 amu
14
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
0.32
12
Not Available
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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