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Lutetium vs Neptunium

Lutetium
Neptunium
Neptunium vs Lutetium


Periodic Table
Symbol
Lu  
Np  
Group Number
Not Available  
Not Available  
Period Number
6  
7  
Block
f block  
f block  
Element Family
Lanthanide  
Actinide  
CAS Number
7439943  
99+
7439998  
99+
Space Group Name
P63/mmc  
Pnma  
Space Group Number
194.00  
5
62.00  
11
Facts
Interesting Facts
  • Metal dust of Lutetium element is highly explosive.
  • Lutetium metal is corrosion resistance and acts stable in air.
  
Not Available  
Sources
Found in Minerals, Mining, Ores of Minerals  
Made by Bombarding Uranium with Neutrons, Ores of metals  
History
  
  
Who Discovered
Georges Urbain and Carl Auer von Welsbach  
Edwin McMillan and Philip H. Abelson  
Discovery
In 1906  
In 1940  
Abundance
  
  
Abundance In Universe
1 * 10-8 %  
30
Not Available  
Abundance In Sun
~0.0000001 %  
26
~-9999 %  
Abundance In Meteorites
0.00 %  
99+
Not Available  
Abundance In Earth's Crust
0.00 %  
99+
Not Available  
Abundance In Oceans
0.00 %  
99+
Not Available  
Uses
Uses & Benefits
  • Lutetium metal is used outside research. It has commercial uses like Industrial catalyst for cracking oil refineries of hydrocarbons .
  
  • 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
Alloys  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Low Toxic  
Toxic  
Present in Human Body
No  
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
1,652.00 °C  
19
640.00 °C  
99+
Boiling Point
3,402.00 °C  
19
3,902.00 °C  
13
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Metallic  
Metallic  
Hardness
  
  
Brinell Hardness
893.00 MPa  
10
Not Available  
Vickers Hardness
1,160.00 MPa  
8
Not Available  
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
Lu  
Np  
Isotopes
  
  
Known Isotopes
35  
4
20  
19
Electronegativity
  
  
Pauling Electronegativity
1.27  
34
1.36  
29
Allred Rochow Electronegativity
1.14  
28
1.22  
26
Electropositivity
  
  
Pauling Electropositivity
2.73  
20
2.64  
25
Ionization Energies
  
  
1st Energy Level
523.50 kJ/mol  
99+
604.50 kJ/mol  
99+
2nd Energy Level
1,340.00 kJ/mol  
99+
1,128.00 kJ/mol  
99+
3rd Energy Level
2,022.30 kJ/mol  
99+
1,997.00 kJ/mol  
99+
4th Energy Level
4,370.00 kJ/mol  
28
3,242.00 kJ/mol  
99+
5th Energy Level
6,445.00 kJ/mol  
21
Not Available  
Electrochemical Equivalent
2.18 g/amp-hr  
23
1.77 g/amp-hr  
39
Electron Work Function
3.30 eV  
33
Not Available  
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic Properties
Atomic Number
71  
99+
93  
25
Electron Configuration
[Xe] 6s2 4f14 5d1  
[Rn] 5f4 6d1 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Orthorhombic (ORTH)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
ORTH-Crystal-Structure-of-Neptunium.jpg#100  
Atom
  
  
Number of Protons
71  
99+
93  
25
Number of Neutrons
104  
30
144  
14
Number of Electrons
71  
99+
93  
25
Radius of an Atom
  
  
Atomic Radius
174.00 pm  
20
155.00 pm  
30
Covalent Radius
187.00 pm  
20
190.00 pm  
18
Van der Waals Radius
221.00 pm  
22
221.00 pm  
22
Atomic Weight
174.97 amu  
40
237.00 amu  
22
Atomic Volume
17.78 cm3/mol  
30
11.62 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Ytterbium
  
Uranium
  
Next Element
Hafnium
  
Plutonium
  
Valence Electron Potential
50.90 (-eV)  
26
96.00 (-eV)  
9
Lattice Constant
350.31 pm  
99+
666.30 pm  
3
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.59  
10
Not Available  
Mechanical Properties
Density
  
  
Density At Room Temperature
9.84 g/cm3  
38
19.38 g/cm3  
14
Density When Liquid (at m.p.)
9.30 g/cm3  
22
Not Available  
Tensile Strength
Not Available  
125.00 MPa  
14
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
33
Not Available  
Vapor Pressure at 2000 K
3.18 (Pa)  
11
0.11 (Pa)  
17
Elasticity properties
  
  
Shear Modulus
27.20 GPa  
26
Not Available  
Bulk Modulus
47.60 GPa  
23
Not Available  
Young's Modulus
68.60 GPa  
30
Not Available  
Poisson Ratio
0.26  
21
Not Available  
Other Mechanical Properties
NA  
Ductile  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
9.84  
29
20.25  
6
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
582.00 nΩ·m  
9
1.22 nΩ·m  
99+
Electrical Conductivity
0.02 106/cm Ω  
99+
0.01 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
21
Not Available  
Thermal Properties
Specific Heat
0.15 J/(kg K)  
36
0.12 J/(kg K)  
40
Molar Heat Capacity
26.86 J/mol·K  
24
29.46 J/mol·K  
8
Thermal Conductivity
16.40 W/m·K  
99+
6.30 W/m·K  
99+
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
9.90 µm/(m·K)  
40
Not Available  
Enthalpy
  
  
Enthalpy of Vaporization
355.90 kJ/mol  
22
Not Available  
Enthalpy of Fusion
18.70 kJ/mol  
13
3.20 kJ/mol  
99+
Enthalpy of Atomization
398.00 kJ/mol  
20
Not Available  
Standard Molar Entropy
51.00 J/mol.K  
30
Not Available  
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