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Neptunium vs Technetium

Neptunium
Technetium
Technetium vs Neptunium


Periodic Table
Symbol
Np   
Tc   
Group Number
Not Available   
7   
11
Period Number
7   
5   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7439998   
99+
7440268   
99+
Space Group Name
Pnma   
P63/mmc   
Space Group Number
62.00   
11
194.00   
5
Facts
Interesting Facts
Not Available   
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals   
Made by Bombarding Molybdenum with Deuterons   
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson   
Emilio Segrè and Carlo Perriero   
Discovery
In 1940   
In 1937   
Abundance
  
  
Uses
Uses & Benefits
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Toxic   
Low Toxic   
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
640.00 °C   
99+
2,200.00 °C   
9
Boiling Point
3,902.00 °C   
13
4,877.00 °C   
7
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Shiny Gray   
Luster
Metallic   
NA   
Hardness
  
  
Speed of Sound
Not Available   
16,200.00 m/s   
1
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
Np   
Tc   
Isotopes
  
  
Known Isotopes
20   
19
18   
21
Electronegativity
  
  
Pauling Electronegativity
1.36   
29
1.90   
11
Allred Rochow Electronegativity
1.22   
26
1.36   
20
Allen Electronegativity
Not Available   
1.51   
28
Electropositivity
  
  
Pauling Electropositivity
2.64   
25
2.10   
99+
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol   
99+
702.00 kJ/mol   
36
2nd Energy Level
1,128.00 kJ/mol   
99+
1,470.00 kJ/mol   
99+
3rd Energy Level
1,997.00 kJ/mol   
99+
2,850.00 kJ/mol   
33
4th Energy Level
3,242.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.77 g/amp-hr   
39
0.52 g/amp-hr   
99+
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
93   
25
43   
99+
Electron Configuration
[Rn] 5f4 6d1 7s2   
[Kr] 4d5 5s2   
Crystal Structure
Orthorhombic (ORTH)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
HCP-Crystal-Structure-of-Technetium.jpg#100   
Atom
  
  
Number of Protons
93   
25
43   
99+
Number of Neutrons
144   
14
55   
99+
Number of Electrons
93   
25
43   
99+
Radius of an Atom
  
  
Atomic Radius
155.00 pm   
30
136.00 pm   
99+
Covalent Radius
190.00 pm   
18
147.00 pm   
37
Van der Waals Radius
221.00 pm   
22
200.00 pm   
28
Atomic Weight
237.00 amu   
22
98.00 amu   
99+
Atomic Volume
11.62 cm3/mol   
99+
8.50 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Molybdenum
  
Next Element
Plutonium
  
Ruthenium
  
Valence Electron Potential
96.00 (-eV)   
9
180.00 (-eV)   
3
Lattice Constant
666.30 pm   
3
273.50 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.60   
5
Mechanical Properties
Density
  
  
Density At Room Temperature
19.38 g/cm3   
14
11.00 g/cm3   
34
Tensile Strength
125.00 MPa   
14
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.11 (Pa)   
17
Not Available   
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Ductile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
20.25   
6
11.50   
24
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
1.22 nΩ·m   
99+
200.00 nΩ·m   
18
Electrical Conductivity
0.01 106/cm Ω   
99+
0.07 106/cm Ω   
30
Electron Affinity
Not Available   
53.00 kJ/mol   
18
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.21 J/(kg K)   
29
Molar Heat Capacity
29.46 J/mol·K   
8
24.27 J/mol·K   
99+
Thermal Conductivity
6.30 W/m·K   
99+
50.60 W/m·K   
30
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
7.10 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
660.00 kJ/mol   
6
Enthalpy of Fusion
3.20 kJ/mol   
99+
23.01 kJ/mol   
9
Enthalpy of Atomization
Not Available   
649.00 kJ/mol   
8
Standard Molar Entropy
Not Available   
181.10 J/mol.K   
2
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