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Neptunium vs Europium

Neptunium
Europium
Europium vs Neptunium


Periodic Table
Symbol
Np   
Eu   
Group Number
Not Available   
Not Available   
Period Number
7   
6   
Block
f block   
f block   
Element Family
Actinide   
Lanthanide   
CAS Number
7439998   
99+
7440531   
34
Space Group Name
Pnma   
Im_ 3m   
Space Group Number
62.00   
11
229.00   
1
Facts
Interesting Facts
Not Available   
Not Available   
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   
Eugène-Anatole Demarçay   
Discovery
In 1940   
In 1896   
Abundance
  
  
Abundance In Universe
Not Available   
5 * 10-8 %   
27
Abundance In Sun
~-9999 %   
~0.00000005 %   
27
Abundance In Meteorites
Not Available   
0.00 %   
99+
Abundance In Earth's Crust
Not Available   
0.00 %   
36
Abundance In Oceans
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.
  
  • Europium metals main uses is in the printing of euro banknotes. These notes glow red under UV light.
  • It is used in low energy light bulbs.
  
Industrial Uses
NA   
Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
Non 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+
822.00 °C   
99+
Boiling Point
3,902.00 °C   
13
1,597.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery White   
Luster
Metallic   
Lustrous   
Hardness
  
  
Vickers Hardness
Not Available   
167.00 MPa   
34
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
Np   
Eu   
Isotopes
  
  
Known Isotopes
20   
19
31   
8
Electronegativity
  
  
Pauling Electronegativity
1.36   
29
1.20   
39
Sanderson Electronegativity
Not Available   
1.01   
22
Allred Rochow Electronegativity
1.22   
26
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.64   
25
Not Available   
Ionization Energies
  
  
1st Energy Level
604.50 kJ/mol   
99+
547.10 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
1,085.00 kJ/mol   
99+
3rd Energy Level
1,997.00 kJ/mol   
99+
2,404.00 kJ/mol   
99+
4th Energy Level
3,242.00 kJ/mol   
99+
4,120.00 kJ/mol   
33
Electrochemical Equivalent
1.77 g/amp-hr   
39
1.89 g/amp-hr   
33
Electron Work Function
Not Available   
2.50 eV   
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
93   
25
63   
99+
Electron Configuration
[Rn] 5f4 6d1 7s2   
[Xe] 4f7 6s2   
Crystal Structure
Orthorhombic (ORTH)   
Body Centered Cubic (BCC)   
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
93   
25
63   
99+
Number of Neutrons
144   
14
89   
38
Number of Electrons
93   
25
63   
99+
Radius of an Atom
  
  
Atomic Radius
155.00 pm   
30
180.00 pm   
14
Covalent Radius
190.00 pm   
18
198.00 pm   
13
Van der Waals Radius
221.00 pm   
22
233.00 pm   
18
Atomic Weight
237.00 amu   
22
151.96 amu   
99+
Atomic Volume
11.62 cm3/mol   
99+
28.90 cm3/mol   
8
Adjacent Atomic Numbers
  
  
Previous Element
Uranium
  
Samarium
  
Next Element
Plutonium
  
Gadolinium
  
Valence Electron Potential
96.00 (-eV)   
9
45.60 (-eV)   
35
Lattice Constant
666.30 pm   
3
458.10 pm   
17
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
5.26 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
5.13 g/cm3   
99+
Tensile Strength
125.00 MPa   
14
120.00 MPa   
15
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
19.40 (Pa)   
4
Vapor Pressure at 2000 K
0.11 (Pa)   
17
Not Available   
Elasticity properties
  
  
Shear Modulus
Not Available   
7.90 GPa   
99+
Bulk Modulus
Not Available   
8.30 GPa   
99+
Young's Modulus
Not Available   
18.20 GPa   
99+
Poisson Ratio
Not Available   
0.15   
34
Other Mechanical Properties
Ductile   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
20.25   
6
5.24   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
1.22 nΩ·m   
99+
0.90 nΩ·m   
99+
Electrical Conductivity
0.01 106/cm Ω   
99+
0.01 106/cm Ω   
99+
Electron Affinity
Not Available   
50.00 kJ/mol   
21
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
0.18 J/(kg K)   
33
Molar Heat Capacity
29.46 J/mol·K   
8
27.66 J/mol·K   
16
Thermal Conductivity
6.30 W/m·K   
99+
13.90 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
Not Available   
35.00 µm/(m·K)   
8
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
143.50 kJ/mol   
99+
Enthalpy of Fusion
3.20 kJ/mol   
99+
9.21 kJ/mol   
37
Enthalpy of Atomization
Not Available   
180.00 kJ/mol   
99+
Standard Molar Entropy
Not Available   
77.80 J/mol.K   
4
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