Neptunium Europium Comparison
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
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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