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Einsteinium vs Neptunium

Einsteinium
Neptunium
Neptunium vs Einsteinium


Periodic Table
Symbol
Es  
Np  
Group Number
13  
5
3  
15
Period Number
7  
7  
Block
f block  
f block  
Element Family
Actinide  
Actinide  
CAS Number
7429927  
99+
7439998  
99+
Space Group Name
-  
Pnma  
Space Group Number
194.00  
7
62.00  
14
Facts
Interesting Facts
  • Einsteinium is the transuranic element found in US.
  • Only 0.01 mg of Einsteinium was synthesized in 1961.
  
Neptunium was the first transuranium element to be discovered.  
Sources
Made by Bombarding Uranium with Neutrons  
Made by Bombarding Uranium with Neutrons, Ores of metals  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
Edwin McMillan and Philip H. Abelson  
Discovery
In 1952  
In 1940  
Abundance
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
40
Abundance In Sun
0.00 %  
30
0.00 %  
26
Abundance In Meteorites
0.00 %  
99+
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Currently known uses of Einsteinium metal are limited to research purpose only.
  
  • 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
-  
-  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Toxic  
Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
860.00 °C  
99+
640.00 °C  
99+
Boiling Point
996.00 °C  
99+
3,902.00 °C  
13
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silver  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
6.00  
6
Brinell Hardness
240.00 MPa  
99+
622.00 MPa  
23
Vickers Hardness
550.00 MPa  
31
640.00 MPa  
23
Speed of Sound
2,850.00 m/s  
40
2,260.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
63.00 %  
20
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Es  
Np  
Isotopes
  
  
Known Isotopes
16  
23
20  
19
Electronegativity
  
  
Pauling Electronegativity
1.54  
27
1.36  
30
Sanderson Electronegativity
1.30  
25
1.36  
23
Allred Rochow Electronegativity
1.20  
28
1.22  
27
Mulliken-Jaffe Electronegativity
1.30  
33
1.36  
31
Allen Electronegativity
1.30  
40
1.36  
37
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.64  
25
Ionization Energies
  
  
1st Energy Level
619.00 kJ/mol  
99+
604.50 kJ/mol  
99+
2nd Energy Level
1,216.00 kJ/mol  
99+
1,128.00 kJ/mol  
99+
3rd Energy Level
2,334.00 kJ/mol  
99+
1,997.00 kJ/mol  
99+
4th Energy Level
3,734.00 kJ/mol  
99+
3,242.00 kJ/mol  
99+
5th Energy Level
6,190.00 kJ/mol  
40
6,180.00 kJ/mol  
99+
6th Energy Level
6,190.00 kJ/mol  
99+
5,785.00 kJ/mol  
99+
7th Energy level
6,190.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
8th Energy Level
6,190.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
9th Energy Level
4,520.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
10th Energy Level
6,190.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
11th Energy Level
6,190.00 kJ/mol  
99+
6,180.00 kJ/mol  
99+
12th Energy Level
61,900.00 kJ/mol  
12
61,800.00 kJ/mol  
13
13th Energy Level
6,190.00 kJ/mol  
39
6,180.00 kJ/mol  
40
14th Energy Level
6,190.00 kJ/mol  
28
6,180.00 kJ/mol  
29
15th Energy Level
61,900.00 kJ/mol  
40
60,600.00 kJ/mol  
99+
16th Energy Level
61,900.00 kJ/mol  
30
60,420.00 kJ/mol  
31
17th Energy Level
619.00 kJ/mol  
99+
604.00 kJ/mol  
99+
18th Energy Level
6,190.00 kJ/mol  
99+
6,040.00 kJ/mol  
99+
19th Energy Level
619.00 kJ/mol  
99+
604.50 kJ/mol  
99+
20th Energy Level
619.00 kJ/mol  
99+
604.00 kJ/mol  
99+
21st Energy Level
6,190.00 kJ/mol  
15
6,040.00 kJ/mol  
17
22nd Energy Level
619.00 kJ/mol  
38
604.00 kJ/mol  
40
23rd Energy Level
6,190.00 kJ/mol  
15
6,040.00 kJ/mol  
18
24th Energy Level
619.40 kJ/mol  
40
604.50 kJ/mol  
99+
25th Energy Level
619.00 kJ/mol  
99+
604.00 kJ/mol  
99+
26th Energy Level
619.40 kJ/mol  
40
604.00 kJ/mol  
99+
27th Energy Level
619.40 kJ/mol  
99+
604.00 kJ/mol  
99+
28th Energy Level
619.40 kJ/mol  
99+
604.00 kJ/mol  
99+
29th Energy Level
619.40 kJ/mol  
99+
604.00 kJ/mol  
99+
30th Energy Level
619.40 kJ/mol  
99+
604.00 kJ/mol  
99+
Electrochemical Equivalent
4.74 g/amp-hr  
5
1.77 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
4.90 eV  
12
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
99  
19
93  
25
Electron Configuration
[Rn] 5f11 7s2  
[Rn] 5f4 6d1 7s2  
Crystal Structure
Face Centered Cubic (FCC)  
Orthorhombic (ORTH)  
Crystal Lattice
FCC-Crystal-Structure-of-Einsteinium.jpg#100  
ORTH-Crystal-Structure-of-Neptunium.jpg#100  
Atom
  
  
Number of Protons
99  
19
93  
25
Number of Neutrons
153  
10
144  
15
Number of Electrons
99  
19
93  
25
Radius of an Atom
  
  
Atomic Radius
186.00 pm  
11
155.00 pm  
32
Covalent Radius
186.00 pm  
21
190.00 pm  
18
Van der Waals Radius
0.00 pm  
99+
221.00 pm  
27
Atomic Weight
252.00 amu  
16
237.00 amu  
22
Atomic Volume
17.04 cm3/mol  
99+
11.62 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Californium
  
Uranium
  
Next Element
Fermium
  
Plutonium
  
Valence Electron Potential
0.00 (-eV)  
99+
96.00 (-eV)  
9
Lattice Constant
582.00 pm  
8
666.30 pm  
3
Lattice Angles
-  
π/2, π/2, π/2  
Lattice C/A Ratio
1.29  
99+
1.43  
99+
Mechanical
Density
  
  
Density At Room Temperature
8.84 g/cm3  
99+
19.38 g/cm3  
14
Density When Liquid (at m.p.)
8.84 g/cm3  
99+
20.25 g/cm3  
10
Tensile Strength
0.10 MPa  
99+
125.00 MPa  
26
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.11 (Pa)  
17
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
5.60 GPa  
99+
Bulk Modulus
40.00 GPa  
38
180.00 GPa  
9
Young's Modulus
0.00 GPa  
99+
46.00 GPa  
99+
Poisson Ratio
0.33  
11
0.26  
22
Other Mechanical Properties
-  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
8.84  
99+
20.25  
15
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
6
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
6.30 nΩ·m  
99+
1.22 nΩ·m  
99+
Electrical Conductivity
0.14 106/cm Ω  
15
0.01 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
118.60 kJ/mol  
6
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.12 J/(kg K)  
99+
Molar Heat Capacity
27.20 J/mol·K  
24
29.46 J/mol·K  
10
Thermal Conductivity
0.00 W/m·K  
99+
6.30 W/m·K  
99+
Critical Temperature
1,133.00 K  
99+
913.00 K  
99+
Thermal Expansion
13.50 µm/(m·K)  
33
13.30 µm/(m·K)  
35
Enthalpy
  
  
Enthalpy of Vaporization
323.80 kJ/mol  
99+
336.00 kJ/mol  
39
Enthalpy of Fusion
14.80 kJ/mol  
24
3.20 kJ/mol  
99+
Enthalpy of Atomization
-  
275.30 kJ/mol  
99+
Standard Molar Entropy
63.00 J/mol.K  
24
64.00 J/mol.K  
21
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