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Neptunium Osmium Comparison

Neptunium
Osmium
Osmium Neptunium comparison


Periodic Table
Symbol
Np   
Os   
Group Number
Not Available   
8   
10
Period Number
7   
6   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7439998   
99+
7440042   
99+
Space Group Name
Pnma   
P63/mmc   
Space Group Number
62.00   
11
194.00   
5
Facts
Interesting Facts
Not Available   
  • Osmium metal does not oxidize in air unless it is heated.
  • But if it heated den it forms Osmium Tetroxide, which is highly toxic.
  
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals   
Found As a By-product, Found in Minerals, Mining   
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson   
Smithson Tennant   
Discovery
In 1940   
In 1803   
Abundance
  
  
Abundance In Universe
Not Available   
3 * 10-7 %   
21
Abundance In Sun
~-9999 %   
~0.0000002 %   
25
Abundance In Meteorites
Not Available   
0.00 %   
28
Abundance In Earth's Crust
Not Available   
0.00 %   
99+
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.
  
  • Its has very limited uses and its alloys are very hard and are used in the manufacturing of pen tips, pivots, needles and electrical contacts.
  • It is also used as industrial catalyst to speed up the chemical reaction.
  
Industrial Uses
NA   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
Highly Toxic   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
Not Available   
In Bone
0.00 p.p.m.   
36
Not Available   
Physical Properties
Melting Point
640.00 °C   
99+
3,045.00 °C   
3
Boiling Point
3,902.00 °C   
13
5,027.00 °C   
6
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery Bluish-Gray   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
7.00   
3
Brinell Hardness
Not Available   
3,490.00 MPa   
1
Speed of Sound
Not Available   
4,940.00 m/s   
11
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   
Os   
Isotopes
  
  
Known Isotopes
20   
19
35   
4
Electronegativity
  
  
Pauling Electronegativity
1.36   
29
2.20   
4
Allred Rochow Electronegativity
1.22   
26
1.52   
12
Allen Electronegativity
Not Available   
1.65   
19
Electropositivity
  
  
Pauling Electropositivity
2.64   
25
1.80   
99+
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol   
99+
840.00 kJ/mol   
12
2nd Energy Level
1,128.00 kJ/mol   
99+
1,309.80 kJ/mol   
99+
3rd Energy Level
1,997.00 kJ/mol   
99+
1,600.00 kJ/mol   
99+
4th Energy Level
3,242.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.77 g/amp-hr   
39
1.77 g/amp-hr   
38
Electron Work Function
Not Available   
4.83 eV   
8
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Chemical Stability, Ionization, Solubility   
Atomic Properties
Atomic Number
93   
25
76   
40
Electron Configuration
[Rn] 5f4 6d1 7s2   
[Xe] 4f14 5d6 6s2   
Crystal Structure
Orthorhombic (ORTH)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
93   
25
76   
39
Number of Neutrons
144   
14
114   
25
Number of Electrons
93   
25
76   
39
Radius of an Atom
  
  
Atomic Radius
155.00 pm   
30
133.80 pm   
99+
Covalent Radius
190.00 pm   
18
Not Available   
Van der Waals Radius
221.00 pm   
22
216.00 pm   
24
Atomic Weight
237.00 amu   
22
190.23 amu   
35
Atomic Volume
11.62 cm3/mol   
99+
8.49 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Rhenium
  
Next Element
Plutonium
  
Iridium
  
Valence Electron Potential
96.00 (-eV)   
9
91.40 (-eV)   
12
Lattice Constant
666.30 pm   
3
273.44 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.58   
14
Mechanical Properties
Density
  
  
Density At Room Temperature
19.38 g/cm3   
14
22.59 g/cm3   
9
Density When Liquid (at m.p.)
Not Available   
20.00 g/cm3   
1
Tensile Strength
125.00 MPa   
14
1,000.00 MPa   
4
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.11 (Pa)   
17
0.00 (Pa)   
28
Elasticity properties
  
  
Shear Modulus
Not Available   
222.00 GPa   
1
Bulk Modulus
Not Available   
462.00 GPa   
1
Poisson Ratio
Not Available   
0.25   
24
Other Mechanical Properties
Ductile   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
20.25   
6
22.57   
2
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
1.22 nΩ·m   
99+
81.20 nΩ·m   
35
Electrical Conductivity
0.01 106/cm Ω   
99+
0.11 106/cm Ω   
18
Electron Affinity
Not Available   
106.10 kJ/mol   
9
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.13 J/(kg K)   
39
Molar Heat Capacity
29.46 J/mol·K   
8
24.70 J/mol·K   
99+
Thermal Conductivity
6.30 W/m·K   
99+
87.60 W/m·K   
19
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
5.10 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
627.60 kJ/mol   
7
Enthalpy of Fusion
3.20 kJ/mol   
99+
29.30 kJ/mol   
4
Enthalpy of Atomization
Not Available   
669.00 kJ/mol   
6
Standard Molar Entropy
Not Available   
32.60 J/mol.K   
99+
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