Tungsten Neptunium Comparison
Periodic Table
Symbol
W
Np
Group Number
6
12
Not Available
Period Number
6
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
7440337
99+
7439998
99+
Space Group Name
Im_ 3m
Pnma
Space Group Number
229.00
1
62.00
11
Facts
Interesting Facts
- Tungsten element has the second highest melting point.
- Pure tungsten can easily cut down with the help of hacksaw.
Not Available
Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals
Made by Bombarding Uranium with Neutrons, Ores of metals
History
Who Discovered
Not Available
Edwin McMillan and Philip H. Abelson
Discovery
In 1781
In 1940
Abundance
Abundance In Universe
5 * 10-8 %
27
Not Available
Abundance In Sun
~0.0000004 %
23
~-9999 %
Abundance In Meteorites
0.00 %
39
Not Available
Abundance In Earth's Crust
0.00 %
39
Not Available
Abundance In Oceans
0.00 %
18
Not Available
Uses
Uses & Benefits
- Tungsten and its alloys are used in high-temperature applications like welding electrodes, high-temperature furnace, etc.
- Tungsten carbide is very hard and used in metal working, mining and petroleum industry.
- 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
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
NA
Medical Uses
NA
NA
Other Uses
Alloys
Alloys, Nuclear Research, Research Purposes
Biological Properties
Toxicity
Non Toxic
Toxic
Present in Human Body
Yes
No
In Blood
0.00 Blood/mg dm-3
31
0.00 Blood/mg dm-3
37
In Bone
0.00 p.p.m.
35
0.00 p.p.m.
36
Physical Properties
Melting Point
3,410.00 °C
1
640.00 °C
99+
Boiling Point
5,660.00 °C
1
3,902.00 °C
13
Appearance
Physical State
Solid
Solid
Color
Grayish White
Silver
Luster
Lustrous
Metallic
Hardness
Mohs Hardness
7.50
2
Not Available
Brinell Hardness
2,000.00 MPa
4
Not Available
Vickers Hardness
3,430.00 MPa
1
Not Available
Speed of Sound
4,620.00 m/s
16
Not Available
Optical Properties
Reflectivity
62.00 %
13
Not Available
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
W
Np
Isotopes
Known Isotopes
33
6
20
19
Electronegativity
Pauling Electronegativity
2.36
2
1.36
29
Sanderson Electronegativity
0.98
23
Not Available
Allred Rochow Electronegativity
1.40
19
1.22
26
Allen Electronegativity
1.47
29
Not Available
Electropositivity
Pauling Electropositivity
1.64
99+
2.64
25
Ionization Energies
1st Energy Level
770.00 kJ/mol
16
604.50 kJ/mol
99+
2nd Energy Level
1,700.00 kJ/mol
29
1,128.00 kJ/mol
99+
3rd Energy Level
Not Available
1,997.00 kJ/mol
99+
4th Energy Level
Not Available
3,242.00 kJ/mol
99+
Electrochemical Equivalent
1.14 g/amp-hr
99+
1.77 g/amp-hr
39
Electron Work Function
4.55 eV
13
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
74
99+
93
25
Electron Configuration
[Xe] 4f14 5d4 6s2
[Rn] 5f4 6d1 7s2
Crystal Structure
Body Centered Cubic (BCC)
Orthorhombic (ORTH)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
ORTH-Crystal-Structure-of-Neptunium.jpg#100
Atom
Number of Protons
74
99+
93
25
Number of Neutrons
110
27
144
14
Number of Electrons
74
99+
93
25
Radius of an Atom
Atomic Radius
139.00 pm
39
155.00 pm
30
Covalent Radius
162.00 pm
29
190.00 pm
18
Van der Waals Radius
200.00 pm
28
221.00 pm
22
Atomic Weight
183.84 amu
37
237.00 amu
22
Atomic Volume
9.53 cm3/mol
99+
11.62 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
140.00 (-eV)
5
96.00 (-eV)
9
Lattice Constant
316.52 pm
99+
666.30 pm
3
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
19.25 g/cm3
16
19.38 g/cm3
14
Density When Liquid (at m.p.)
17.60 g/cm3
5
Not Available
Tensile Strength
370.00 MPa
10
125.00 MPa
14
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
0.00 (Pa)
32
0.11 (Pa)
17
Elasticity properties
Shear Modulus
161.00 GPa
5
Not Available
Bulk Modulus
310.00 GPa
4
Not Available
Young's Modulus
411.00 GPa
4
Not Available
Poisson Ratio
0.28
17
Not Available
Other Mechanical Properties
Ductile, Malleable
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
19.22
9
20.25
6
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Superconductor
Conductor
Resistivity
52.80 nΩ·m
99+
1.22 nΩ·m
99+
Electrical Conductivity
0.19 106/cm Ω
10
0.01 106/cm Ω
99+
Electron Affinity
78.60 kJ/mol
13
Not Available
Thermal Properties
Specific Heat
0.13 J/(kg K)
39
0.12 J/(kg K)
40
Molar Heat Capacity
24.27 J/mol·K
99+
29.46 J/mol·K
8
Thermal Conductivity
173.00 W/m·K
7
6.30 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
4.50 µm/(m·K)
99+
Not Available
Enthalpy
Enthalpy of Vaporization
799.10 kJ/mol
1
Not Available
Enthalpy of Fusion
35.23 kJ/mol
1
3.20 kJ/mol
99+
Enthalpy of Atomization
837.00 kJ/mol
1
Not Available
Standard Molar Entropy
32.60 J/mol.K
99+
Not Available
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