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Nobelium vs Neptunium

Nobelium
Neptunium
Neptunium vs Nobelium


Periodic Table
Symbol
No  
Np  
Group Number
Not Available  
Not Available  
Period Number
7  
7  
Block
f block  
f block  
Element Family
Actinide  
Actinide  
CAS Number
10028145  
16
7439998  
99+
Space Group Name
Not Available  
Pnma  
Space Group Number
Not Available  
62.00  
11
Facts
Interesting Facts
  • The most stable isotope of Nobelium metal is No-259.
  • No-259 has a half-life of fifty-eight minutes.
  
Not Available  
Sources
Bombarding Curium-246 or Curium-249 with Carbon-12 Nuclei, Found in Minerals, Mining  
Made by Bombarding Uranium with Neutrons, Ores of metals  
History
  
  
Who Discovered
Joint Institute for Nuclear Research  
Edwin McMillan and Philip H. Abelson  
Discovery
In 1966  
In 1940  
Abundance
  
  
Uses
Uses & Benefits
  • Currently known uses of Nobelium metal are limited to research purpose only.
  
  • Currently known uses of Neptunium metal are limited to research purpose only.
  • Neptunium’s isotope neptunium-237 is used as a neutron detectors.
  
Industrial Uses
NA  
NA  
Medical Uses
NA  
NA  
Other Uses
Research Purposes  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Unknown  
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
827.00 °C  
99+
640.00 °C  
99+
Boiling Point
Not Available  
3,902.00 °C  
13
Appearance
  
  
Physical State
Solid  
Solid  
Color
Unknown  
Silver  
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
No  
Np  
Isotopes
  
  
Known Isotopes
13  
26
20  
19
Electronegativity
  
  
Pauling Electronegativity
1.30  
32
1.36  
29
Allred Rochow Electronegativity
1.20  
27
1.22  
26
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.64  
25
Ionization Energies
  
  
1st Energy Level
642.00 kJ/mol  
99+
604.50 kJ/mol  
99+
2nd Energy Level
1,254.00 kJ/mol  
99+
1,128.00 kJ/mol  
99+
3rd Energy Level
2,643.00 kJ/mol  
99+
1,997.00 kJ/mol  
99+
4th Energy Level
3,956.00 kJ/mol  
39
3,242.00 kJ/mol  
99+
Electrochemical Equivalent
4.83 g/amp-hr  
4
1.77 g/amp-hr  
39
Electron Work Function
Not Available  
Not Available  
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic Properties
Atomic Number
102  
16
93  
25
Electron Configuration
[Rn] 5f14 7s2  
[Rn] 5f4 6d1 7s2  
Crystal Structure
Not Known  
Orthorhombic (ORTH)  
Crystal Lattice
Unknown-Crystal-Structure-of-Nobelium.jpg#100  
ORTH-Crystal-Structure-of-Neptunium.jpg#100  
Atom
  
  
Number of Protons
102  
16
93  
25
Number of Neutrons
157  
7
144  
14
Number of Electrons
102  
16
93  
25
Radius of an Atom
  
  
Atomic Radius
Not Available  
155.00 pm  
30
Covalent Radius
Not Available  
190.00 pm  
18
Van der Waals Radius
246.00 pm  
8
221.00 pm  
22
Atomic Weight
259.00 amu  
13
237.00 amu  
22
Atomic Volume
Not Available  
11.62 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Mendelevium
  
Uranium
  
Next Element
Lawrencium
  
Plutonium
  
Valence Electron Potential
26.00 (-eV)  
99+
96.00 (-eV)  
9
Lattice Constant
Not Available  
666.30 pm  
3
Lattice Angles
NA  
π/2, π/2, π/2  
Lattice C/A Ratio
Not Available  
Not Available  
Mechanical Properties
Density
  
  
Density At Room Temperature
Not Available  
19.38 g/cm3  
14
Tensile Strength
Not Available  
125.00 MPa  
14
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available  
0.11 (Pa)  
17
Elasticity properties
  
  
Poisson Ratio
Not Available  
Not Available  
Other Mechanical Properties
Unknown  
Ductile  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available  
20.25  
6
Magnetic Ordering
Unknown  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Unknown  
Conductor  
Resistivity
Not Available  
1.22 nΩ·m  
99+
Electrical Conductivity
Not Available  
0.01 106/cm Ω  
99+
Thermal Properties
Specific Heat
Not Available  
0.12 J/(kg K)  
40
Molar Heat Capacity
Not Available  
29.46 J/mol·K  
8
Thermal Conductivity
Not Available  
6.30 W/m·K  
99+
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
Not Available  
Not Available  
Enthalpy
  
  
Enthalpy of Fusion
Not Available  
3.20 kJ/mol  
99+
Standard Molar Entropy
Not Available  
Not Available  
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