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Technetium vs Mendelevium

Technetium
Mendelevium
Mendelevium vs Technetium


Periodic Table
Symbol
Tc   
Md   
Group Number
7   
11
Not Available   
Period Number
5   
7   
Block
d block   
f block   
Element Family
Transition Metal   
Actinide   
CAS Number
7440268   
99+
7440111   
99+
Space Group Name
P63/mmc   
Not Available   
Space Group Number
194.00   
5
Not Available   
Facts
Interesting Facts
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Made by Bombarding Molybdenum with Deuterons   
Bombarding Einsteinium with Helium Ions   
History
  
  
Who Discovered
Emilio Segrè and Carlo Perriero   
Lawrence Berkeley National Laboratory   
Discovery
In 1937   
In 1955   
Abundance
  
  
Uses
Uses & Benefits
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
NA   
Biological Properties
  
  
Toxicity
Low Toxic   
Unknown   
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
2,200.00 °C   
9
827.00 °C   
99+
Boiling Point
4,877.00 °C   
7
Not Available   
Appearance
  
  
Physical State
Solid   
Solid   
Color
Shiny Gray   
Unknown   
Luster
NA   
Metallic   
Hardness
  
  
Speed of Sound
16,200.00 m/s   
1
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
Tc   
Md   
Isotopes
  
  
Known Isotopes
18   
21
16   
23
Electronegativity
  
  
Pauling Electronegativity
1.90   
11
1.30   
32
Allred Rochow Electronegativity
1.36   
20
1.20   
27
Allen Electronegativity
1.51   
28
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.10   
99+
2.70   
22
Ionization Energies
  
  
1st Energy Level
702.00 kJ/mol   
36
635.00 kJ/mol   
99+
2nd Energy Level
1,470.00 kJ/mol   
99+
1,235.00 kJ/mol   
99+
3rd Energy Level
2,850.00 kJ/mol   
33
2,470.00 kJ/mol   
99+
4th Energy Level
Not Available   
3,840.00 kJ/mol   
99+
Electrochemical Equivalent
0.52 g/amp-hr   
99+
3.21 g/amp-hr   
12
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
43   
99+
101   
17
Electron Configuration
[Kr] 4d5 5s2   
[Rn] 5f13 7s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Not Known   
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100   
Unknown-Crystal-Structure-of-Mendelevium.jpg#100   
Atom
  
  
Number of Protons
43   
99+
101   
17
Number of Neutrons
55   
99+
157   
7
Number of Electrons
43   
99+
101   
17
Radius of an Atom
  
  
Atomic Radius
136.00 pm   
99+
Not Available   
Covalent Radius
147.00 pm   
37
Not Available   
Van der Waals Radius
200.00 pm   
28
246.00 pm   
8
Atomic Weight
98.00 amu   
99+
258.00 amu   
14
Atomic Volume
8.50 cm3/mol   
99+
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Molybdenum
  
Fermium
  
Next Element
Ruthenium
  
Nobelium
  
Valence Electron Potential
180.00 (-eV)   
3
Not Available   
Lattice Constant
273.50 pm   
99+
Not Available   
Lattice Angles
π/2, π/2, 2 π/3   
NA   
Lattice C/A Ratio
1.60   
5
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
11.00 g/cm3   
34
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
NA   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
11.50   
24
Not Available   
Magnetic Ordering
Paramagnetic   
Unknown   
Electrical Properties
  
  
Electrical Property
Conductor   
Unknown   
Resistivity
200.00 nΩ·m   
18
Not Available   
Electrical Conductivity
0.07 106/cm Ω   
30
Not Available   
Electron Affinity
53.00 kJ/mol   
18
Not Available   
Thermal Properties
Specific Heat
0.21 J/(kg K)   
29
Not Available   
Molar Heat Capacity
24.27 J/mol·K   
99+
Not Available   
Thermal Conductivity
50.60 W/m·K   
30
Not Available   
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
7.10 µm/(m·K)   
99+
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
660.00 kJ/mol   
6
Not Available   
Enthalpy of Fusion
23.01 kJ/mol   
9
Not Available   
Enthalpy of Atomization
649.00 kJ/mol   
8
Not Available   
Standard Molar Entropy
181.10 J/mol.K   
2
Not Available   
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