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Neptunium vs Iridium

Neptunium
Iridium
Iridium vs Neptunium


Periodic Table
Symbol
Np   
Ir   
Group Number
Not Available   
9   
9
Period Number
7   
6   
Block
f block   
d block   
Element Family
Actinide   
Transition Metal   
CAS Number
7439998   
99+
7439885   
99+
Space Group Name
Pnma   
Fm_ 3m   
Space Group Number
62.00   
11
225.00   
2
Facts
Interesting Facts
Not Available   
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Edwin McMillan and Philip H. Abelson   
Smithson Tennant   
Discovery
In 1940   
In 1803   
Abundance
  
  
Abundance In Universe
Not Available   
2 * 10-7 %   
22
Abundance In Sun
~-9999 %   
~0.0000002 %   
25
Abundance In Meteorites
Not Available   
0.00 %   
29
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.
  
  • Iridium has an anti corrosion properties and it is used in special alloy with Osmium metal and that alloy is used in pen tips and compass bearings.
  
Industrial Uses
NA   
Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
Toxic   
Present in Human Body
No   
Yes   
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+
2,410.00 °C   
7
Boiling Point
3,902.00 °C   
13
4,527.00 °C   
10
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery White   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
Not Available   
6.50   
5
Brinell Hardness
Not Available   
1,670.00 MPa   
5
Vickers Hardness
Not Available   
1,760.00 MPa   
3
Speed of Sound
Not Available   
4,825.00 m/s   
13
Optical Properties
  
  
Reflectivity
Not Available   
78.00 %   
6
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   
Ir   
Isotopes
  
  
Known Isotopes
20   
19
34   
5
Electronegativity
  
  
Pauling Electronegativity
1.36   
29
2.20   
4
Allred Rochow Electronegativity
1.22   
26
1.55   
11
Allen Electronegativity
Not Available   
1.68   
17
Electropositivity
  
  
Pauling Electropositivity
2.64   
25
1.80   
99+
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol   
99+
880.00 kJ/mol   
9
2nd Energy Level
1,128.00 kJ/mol   
99+
1,600.00 kJ/mol   
35
3rd Energy Level
1,997.00 kJ/mol   
99+
Not Available   
4th Energy Level
3,242.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.77 g/amp-hr   
39
1.14 g/amp-hr   
99+
Electron Work Function
Not Available   
4.55 eV   
13
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Flammable, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
93   
25
77   
39
Electron Configuration
[Rn] 5f4 6d1 7s2   
[Xe] 4f14 5d7 6s2   
Crystal Structure
Orthorhombic (ORTH)   
Face Centered Cubic (FCC)   
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
FCC-Crystal-Structure-of-Iridium.jpg#100   
Atom
  
  
Number of Protons
93   
25
74   
99+
Number of Neutrons
144   
14
110   
27
Number of Electrons
93   
25
74   
99+
Radius of an Atom
  
  
Atomic Radius
155.00 pm   
30
136.00 pm   
99+
Covalent Radius
190.00 pm   
18
141.00 pm   
99+
Van der Waals Radius
221.00 pm   
22
202.00 pm   
27
Atomic Weight
237.00 amu   
22
192.22 amu   
34
Atomic Volume
11.62 cm3/mol   
99+
9.53 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Osmium
  
Next Element
Plutonium
  
Platinum
  
Valence Electron Potential
96.00 (-eV)   
9
140.00 (-eV)   
5
Lattice Constant
666.30 pm   
3
383.90 pm   
26
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
19.38 g/cm3   
14
22.56 g/cm3   
10
Density When Liquid (at m.p.)
Not Available   
19.00 g/cm3   
3
Tensile Strength
125.00 MPa   
14
2,000.00 MPa   
2
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.11 (Pa)   
17
0.00 (Pa)   
25
Elasticity properties
  
  
Shear Modulus
Not Available   
210.00 GPa   
2
Bulk Modulus
Not Available   
320.00 GPa   
3
Young's Modulus
Not Available   
528.00 GPa   
1
Poisson Ratio
Not Available   
0.26   
22
Other Mechanical Properties
Ductile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
20.25   
6
21.78   
3
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
1.22 nΩ·m   
99+
47.10 nΩ·m   
99+
Electrical Conductivity
0.01 106/cm Ω   
99+
0.19 106/cm Ω   
10
Electron Affinity
Not Available   
151.00 kJ/mol   
4
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
25.10 J/mol·K   
99+
Thermal Conductivity
6.30 W/m·K   
99+
147.00 W/m·K   
10
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
6.40 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
799.10 kJ/mol   
1
Enthalpy of Fusion
3.20 kJ/mol   
99+
35.23 kJ/mol   
1
Enthalpy of Atomization
Not Available   
837.00 kJ/mol   
1
Standard Molar Entropy
Not Available   
35.50 J/mol.K   
99+
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