Rutherfordium vs Mendelevium
Periodic Table
Symbol
Rf
Md
Group Number
4
14
Not Available
Period Number
7
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
53850365
13
7440111
99+
Space Group Name
Not Available
Not Available
Space Group Number
Not Available
Not Available
Facts
Interesting Facts
- Rutherfordium does not occur in nature as it is a synthetic element.
- Till date Rutherfordium metal has 15 radioisotopes created synthetically.
- Mendelevium metal is synthetically produced metal.
- Mendelevium metal has been produced in only trace amount.
Sources
Bombarding Plutonium with Accelerated 113 to 115 MeV Neon Ions, Synthetically Produced
Bombarding Einsteinium with Helium Ions
History
Who Discovered
Joint Institute for Nuclear Research
Lawrence Berkeley National Laboratory
Discovery
In 1964
In 1955
Abundance
Uses
Uses & Benefits
- Currently known uses of Rutherfordium 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
Alloys, Research Purposes
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
2,100.00 °C
11
827.00 °C
99+
Boiling Point
5,500.00 °C
3
Not Available
Appearance
Physical State
Solid
Solid
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
Rf
Md
Isotopes
Known Isotopes
13
26
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
579.90 kJ/mol
99+
635.00 kJ/mol
99+
2nd Energy Level
1,389.40 kJ/mol
99+
1,235.00 kJ/mol
99+
3rd Energy Level
2,296.40 kJ/mol
99+
2,470.00 kJ/mol
99+
4th Energy Level
3,077.90 kJ/mol
99+
3,840.00 kJ/mol
99+
Electrochemical Equivalent
Not Available
3.21 g/amp-hr
12
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
104
14
101
17
Electron Configuration
[Rn] 5f14 6d2 7s2
[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
104
14
101
17
Number of Neutrons
157
7
157
7
Number of Electrons
104
14
101
17
Radius of an Atom
Atomic Radius
150.00 pm
33
Not Available
Covalent Radius
157.00 pm
31
Not Available
Van der Waals Radius
Not Available
246.00 pm
8
Atomic Weight
267.00 amu
11
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
Density At Room Temperature
23.20 g/cm3
8
Not Available
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Poisson Ratio
Not Available
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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