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Iridium vs Neptunium

Iridium
Neptunium
Neptunium vs Iridium


Periodic Table
Symbol
Ir   
Np   
Group Number
9   
9
Not Available   
Period Number
6   
7   
Block
d block   
f block   
Element Family
Transition Metal   
Actinide   
CAS Number
7439885   
99+
7439998   
99+
Space Group Name
Fm_ 3m   
Pnma   
Space Group Number
225.00   
2
62.00   
11
Facts
Interesting Facts
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
Not Available   
Sources
Found in Minerals, Mining, Ores of Minerals   
Made by Bombarding Uranium with Neutrons, Ores of metals   
History
  
  
Who Discovered
Smithson Tennant   
Edwin McMillan and Philip H. Abelson   
Discovery
In 1803   
In 1940   
Abundance
  
  
Abundance In Universe
2 * 10-7 %   
22
Not Available   
Abundance In Sun
~0.0000002 %   
25
~-9999 %   
Abundance In Meteorites
0.00 %   
29
Not Available   
Abundance In Earth's Crust
0.00 %   
99+
Not Available   
Uses
Uses & Benefits
  • 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.
  
  • 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
Automobile Industry, Electrical Industry, Electronic Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
Toxic   
Toxic   
Present in Human Body
Yes   
No   
In Blood
Not Available   
0.00 Blood/mg dm-3   
37
In Bone
Not Available   
0.00 p.p.m.   
36
Physical Properties
Melting Point
2,410.00 °C   
7
640.00 °C   
99+
Boiling Point
4,527.00 °C   
10
3,902.00 °C   
13
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
6.50   
5
Not Available   
Brinell Hardness
1,670.00 MPa   
5
Not Available   
Vickers Hardness
1,760.00 MPa   
3
Not Available   
Speed of Sound
4,825.00 m/s   
13
Not Available   
Optical Properties
  
  
Reflectivity
78.00 %   
6
Not Available   
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
Ir   
Np   
Isotopes
  
  
Known Isotopes
34   
5
20   
19
Electronegativity
  
  
Pauling Electronegativity
2.20   
4
1.36   
29
Allred Rochow Electronegativity
1.55   
11
1.22   
26
Allen Electronegativity
1.68   
17
Not Available   
Electropositivity
  
  
Pauling Electropositivity
1.80   
99+
2.64   
25
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol   
9
604.50 kJ/mol   
99+
2nd Energy Level
1,600.00 kJ/mol   
35
1,128.00 kJ/mol   
99+
3rd Energy Level
Not Available   
1,997.00 kJ/mol   
99+
4th Energy Level
Not Available   
3,242.00 kJ/mol   
99+
Electrochemical Equivalent
1.14 g/amp-hr   
99+
1.77 g/amp-hr   
39
Electron Work Function
4.55 eV   
13
Not Available   
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
77   
39
93   
25
Electron Configuration
[Xe] 4f14 5d7 6s2   
[Rn] 5f4 6d1 7s2   
Crystal Structure
Face Centered Cubic (FCC)   
Orthorhombic (ORTH)   
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100   
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
Atom
  
  
Number of Protons
74   
99+
93   
25
Number of Neutrons
110   
27
144   
14
Number of Electrons
74   
99+
93   
25
Radius of an Atom
  
  
Atomic Radius
136.00 pm   
99+
155.00 pm   
30
Covalent Radius
141.00 pm   
99+
190.00 pm   
18
Van der Waals Radius
202.00 pm   
27
221.00 pm   
22
Atomic Weight
192.22 amu   
34
237.00 amu   
22
Atomic Volume
9.53 cm3/mol   
99+
11.62 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Osmium
  
Uranium
  
Next Element
Platinum
  
Plutonium
  
Valence Electron Potential
140.00 (-eV)   
5
96.00 (-eV)   
9
Lattice Constant
383.90 pm   
26
666.30 pm   
3
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
22.56 g/cm3   
10
19.38 g/cm3   
14
Density When Liquid (at m.p.)
19.00 g/cm3   
3
Not Available   
Tensile Strength
2,000.00 MPa   
2
125.00 MPa   
14
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.00 (Pa)   
25
0.11 (Pa)   
17
Elasticity properties
  
  
Shear Modulus
210.00 GPa   
2
Not Available   
Bulk Modulus
320.00 GPa   
3
Not Available   
Young's Modulus
528.00 GPa   
1
Not Available   
Poisson Ratio
0.26   
22
Not Available   
Other Mechanical Properties
NA   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
21.78   
3
20.25   
6
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
47.10 nΩ·m   
99+
1.22 nΩ·m   
99+
Electrical Conductivity
0.19 106/cm Ω   
10
0.01 106/cm Ω   
99+
Electron Affinity
151.00 kJ/mol   
4
Not Available   
Thermal Properties
Specific Heat
0.13 J/(kg K)   
39
0.12 J/(kg K)   
40
Molar Heat Capacity
25.10 J/mol·K   
99+
29.46 J/mol·K   
8
Thermal Conductivity
147.00 W/m·K   
10
6.30 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
6.40 µm/(m·K)   
99+
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol   
1
Not Available   
Enthalpy of Fusion
35.23 kJ/mol   
1
3.20 kJ/mol   
99+
Enthalpy of Atomization
837.00 kJ/mol   
1
Not Available   
Standard Molar Entropy
35.50 J/mol.K   
99+
Not Available   
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