Symbol
Sg
Np
Group Number
63
0
17
👆🏻
Period Number
77
2
7
👆🏻
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
540388127439998
7429905
54386242
👆🏻
Space Group Name
-
Pnma
Space Group Number
166.0062.00
11
276
👆🏻
Interesting Facts
- Seaborgium most stable isotope is Sg and it has 2.1 min of half- life.
- And other isotopes of Seaborgium have half-lives as short as 3 ms.
Neptunium was the first transuranium element to be discovered.
Sources
Synthetically Produced
Made by Bombarding Uranium with Neutrons, Ores of metals
History
Who Discovered
Lawrence Berkeley National Laboratory
Edwin McMillan and Philip H. Abelson
Discovery
In 1974
In 1940
Abundance
Abundance In Universe
0.00 %0.00 %
0
0.11
👆🏻
Abundance In Sun
-0.00 %
0
0.1
👆🏻
Abundance In Meteorites
-0.00 %
0
22
👆🏻
Abundance In Earth's Crust
-0.00 %
1E-37
8.1
👆🏻
Abundance In Oceans
--
0
1.1
👆🏻
Abundance In Humans
-0.00 %
0
1.4
👆🏻
Uses & Benefits
- Currently known uses of Seaborgium 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
Research Purposes
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
-
Toxic
Present in Human Body
✔
✘
✔
✘
In Blood
0.00 Blood/mg dm-30.00 Blood/mg dm-3
0
1970
👆🏻
In Bone
0.00 p.p.m.0.00 p.p.m.
0
170000
👆🏻
Melting Point
-640.00 °C
-38.83
3410
👆🏻
Boiling Point
0.00 °C3,902.00 °C
0
5660
👆🏻
Appearance
Physical State
Solid
Solid
Color
-
Silver
Luster
Unknown Luster
Metallic
Hardness
Mohs Hardness
6.006.00
0.2
8.5
👆🏻
Brinell Hardness
400.00 MPa622.00 MPa
0.14
3490
👆🏻
Vickers Hardness
520.00 MPa640.00 MPa
0
3920
👆🏻
Speed of Sound
3,200.00 m/s2,260.00 m/s
818
16200
👆🏻
Optical Properties
Refractive Index
1.301.30
0.155
3.41
👆🏻
Reflectivity
68.00 %64.00 %
5
97
👆🏻
Allotropes
✔
✘
✔
✘
α Allotropes
-
-
β Allotropes
-
-
γ Allotropes
-
-
Chemical Formula
Sg
Np
Isotopes
Known Isotopes
920
0
38
👆🏻
Electronegativity
Pauling Electronegativity
0.001.36
0
2.6
👆🏻
Sanderson Electronegativity
1.901.36
0.22
2.56
👆🏻
Allred Rochow Electronegativity
1.301.22
0.86
1.9
👆🏻
Mulliken-Jaffe Electronegativity
1.301.36
0.62
2.48
👆🏻
Allen Electronegativity
1.901.36
0.659
2.7
👆🏻
Electropositivity
Pauling Electropositivity
2.202.64
1.46
3.3
👆🏻
Ionization Energies
1st Energy Level
757.40 kJ/mol604.50 kJ/mol
375.7
26130
👆🏻
2nd Energy Level
1,732.90 kJ/mol1,128.00 kJ/mol
392.8
28750
👆🏻
3rd Energy Level
2,483.50 kJ/mol1,997.00 kJ/mol
392.8
34230
👆🏻
4th Energy Level
3,415.60 kJ/mol3,242.00 kJ/mol
375.7
37066
👆🏻
5th Energy Level
4,561.80 kJ/mol6,180.00 kJ/mol
392
97510
👆🏻
6th Energy Level
5,715.80 kJ/mol5,785.00 kJ/mol
1007
105800
👆🏻
7th Energy level
5,700.00 kJ/mol6,040.00 kJ/mol
1007
114300
👆🏻
8th Energy Level
5,700.00 kJ/mol6,040.00 kJ/mol
730
125300
👆🏻
9th Energy Level
5,710.00 kJ/mol6,180.00 kJ/mol
1007
134700
👆🏻
10th Energy Level
6,270.00 kJ/mol6,180.00 kJ/mol
392
144300
👆🏻
11th Energy Level
6,600.00 kJ/mol6,180.00 kJ/mol
392
169988
👆🏻
12th Energy Level
971.00 kJ/mol61,800.00 kJ/mol
0
189368
👆🏻
13th Energy Level
5,700.00 kJ/mol6,180.00 kJ/mol
1007
76015
👆🏻
14th Energy Level
5,700.00 kJ/mol6,180.00 kJ/mol
380
86450
👆🏻
15th Energy Level
54,000.00 kJ/mol60,600.00 kJ/mol
33000
100700
👆🏻
16th Energy Level
64,000.00 kJ/mol60,420.00 kJ/mol
375.7
109480
👆🏻
17th Energy Level
579.80 kJ/mol604.00 kJ/mol
375.7
122200
👆🏻
18th Energy Level
3,300.00 kJ/mol6,040.00 kJ/mol
0
134810
👆🏻
19th Energy Level
579.80 kJ/mol604.50 kJ/mol
375.7
148700
👆🏻
20th Energy Level
579.00 kJ/mol604.00 kJ/mol
0
171200
👆🏻
21st Energy Level
6,270.00 kJ/mol6,040.00 kJ/mol
375.7
179100
👆🏻
22nd Energy Level
573.00 kJ/mol604.00 kJ/mol
330
184900
👆🏻
23rd Energy Level
5,790.00 kJ/mol6,040.00 kJ/mol
357.6
198800
👆🏻
24th Energy Level
971.00 kJ/mol604.50 kJ/mol
297.3
195200
👆🏻
25th Energy Level
0.00 kJ/mol604.00 kJ/mol
0
121900
👆🏻
26th Energy Level
579.10 kJ/mol604.00 kJ/mol
357.6
127700
👆🏻
27th Energy Level
870.00 kJ/mol604.00 kJ/mol
0
133800
👆🏻
28th Energy Level
870.00 kJ/mol604.00 kJ/mol
297.3
139800
👆🏻
29th Energy Level
761.90 kJ/mol604.00 kJ/mol
0
148100
👆🏻
30th Energy Level
0.00 kJ/mol604.00 kJ/mol
0
154500
👆🏻
Electrochemical Equivalent
3.20 g/amp-hr1.77 g/amp-hr
0.16812
8.3209
👆🏻
Electron Work Function
6.00 eV4.90 eV
2.14
6
👆🏻
Other Chemical Properties
-
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Number
10693
3
117
👆🏻
Electron Configuration
[Rn] 5f14 6d2 7s2
[Rn] 5f4 6d1 7s2
Crystal Structure
Body Centered Cubic (BCC)
Orthorhombic (ORTH)
Crystal Lattice
Atom
Number of Protons
10693
3
117
👆🏻
Number of Neutrons
157144
4
285
👆🏻
Number of Electrons
10693
3
117
👆🏻
Radius of an Atom
Atomic Radius
132.00 pm155.00 pm
0
348
👆🏻
Covalent Radius
143.00 pm190.00 pm
0
260
👆🏻
Van der Waals Radius
230.00 pm221.00 pm
0
348
👆🏻
Atomic Weight
269.00 amu237.00 amu
6.94
294
👆🏻
Atomic Volume
35.00 cm3/mol11.62 cm3/mol
1.39
71.07
👆🏻
Adjacent Atomic Numbers
Previous Element
Next Element
Valence Electron Potential
6.10 (-eV)96.00 (-eV)
0
392.42
👆🏻
Lattice Constant
-666.30 pm
0
891.25
👆🏻
Lattice Angles
-
π/2, π/2, π/2
Lattice C/A Ratio
1.361.43
0.423
1.9
👆🏻
Density
Density At Room Temperature
35.00 g/cm319.38 g/cm3
0.534
40.7
👆🏻
Density When Liquid (at m.p.)
35.00 g/cm320.25 g/cm3
0.512
41
👆🏻
Tensile Strength
30.00 MPa125.00 MPa
0.1
11000
👆🏻
Viscosity
0.000.00
1.5E-05
0.0035
👆🏻
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)0.00 (Pa)
0
121
👆🏻
Vapor Pressure at 2000 K
0.00 (Pa)0.11 (Pa)
0
774
👆🏻
Elasticity properties
Shear Modulus
30.00 GPa5.60 GPa
1.3
222
👆🏻
Bulk Modulus
0.00 GPa180.00 GPa
0
462
👆🏻
Young's Modulus
12.60 GPa46.00 GPa
0
528
👆🏻
Poisson Ratio
0.250.26
0.032
0.47
👆🏻
Other Mechanical Properties
-
Ductile
Magnetic Characteristics
Specific Gravity
35.0020.25
0.53
4500
👆🏻
Magnetic Ordering
-
Paramagnetic
Permeability
0.00 H/m0.00 H/m
1.25643E-06
0.0063
👆🏻
Susceptibility
0.000.00
-0.000166
200000
👆🏻
Electrical Properties
Electrical Property
-
Conductor
Resistivity
0.38 nΩ·m1.22 nΩ·m
0.1
961
👆🏻
Electrical Conductivity
0.00 106/cm Ω0.01 106/cm Ω
0
0.63
👆🏻
Electron Affinity
50.00 kJ/mol118.60 kJ/mol
0
222.8
👆🏻
Specific Heat
0.27 J/(kg K)0.12 J/(kg K)
0.1
3.6
👆🏻
Molar Heat Capacity
35.00 J/mol·K29.46 J/mol·K
13.1
62.7
👆🏻
Thermal Conductivity
0.14 W/m·K6.30 W/m·K
0
429
👆🏻
Critical Temperature
1,200.00 K913.00 K
26.3
3695
👆🏻
Thermal Expansion
11.00 µm/(m·K)13.30 µm/(m·K)
4.5
97
👆🏻
Enthalpy
Enthalpy of Vaporization
585.00 kJ/mol336.00 kJ/mol
7.32
799.1
👆🏻
Enthalpy of Fusion
-3.20 kJ/mol
2.1
35.23
👆🏻
Enthalpy of Atomization
650.00 kJ/mol275.30 kJ/mol
61.5
837
👆🏻
Standard Molar Entropy
42.70 J/mol.K64.00 J/mol.K
9.5
198.1
👆🏻