Neptunium vs Silver
Periodic Table
Symbol
Np
Ag
Group Number
Not Available
11
7
Period Number
7
5
Block
f block
d block
Element Family
Actinide
Transition Metal
CAS Number
7439998
99+
7440224
99+
Space Group Name
Pnma
Fm_ 3m
Space Group Number
62.00
11
225.00
2
Facts
Interesting Facts
Not Available
- It is the most reflective element.
- Silver is the second most ductile metal after Gold.
- It is also used in Dentistry as a dental alloys for clips and crowning.
Sources
Made by Bombarding Uranium with Neutrons, Ores of metals
Earth's crust, Found in Minerals, Ores of metals
History
Who Discovered
Edwin McMillan and Philip H. Abelson
Unknown
Discovery
In 1940
Before 5000 BC
Abundance
Abundance In Universe
Not Available
6 * 10-8 %
26
Abundance In Sun
~-9999 %
~0.0000001 %
26
Abundance In Meteorites
Not Available
0.00 %
38
Abundance In Earth's Crust
Not Available
0.00 %
99+
Abundance In Oceans
Not Available
0.00 %
19
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.
- Silver is mainly used for Jewelry and show piece.
- It is used for manufacturing high quality mirrors due to its reflectivity property.
Industrial Uses
NA
Chemical Industry, Clothing Industry, Electrical Industry
Medical Uses
NA
Dentistry, Pharmaceutical Industry
Other Uses
Alloys, Nuclear Research, Research Purposes
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues
Biological Properties
Toxicity
Toxic
Non Toxic
Present in Human Body
No
Yes
In Blood
0.00 Blood/mg dm-3
37
0.00 Blood/mg dm-3
29
In Bone
0.00 p.p.m.
36
0.44 p.p.m.
20
Physical Properties
Melting Point
640.00 °C
99+
961.93 °C
99+
Boiling Point
3,902.00 °C
13
2,212.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silver
Silvery White
Luster
Metallic
Metallic
Hardness
Mohs Hardness
Not Available
2.50
14
Brinell Hardness
Not Available
251.00 MPa
37
Vickers Hardness
Not Available
229.00 MPa
30
Speed of Sound
Not Available
2,680.00 m/s
34
Optical Properties
Reflectivity
Not Available
97.00 %
1
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
Ag
Isotopes
Known Isotopes
20
19
36
3
Electronegativity
Pauling Electronegativity
1.36
29
1.93
9
Sanderson Electronegativity
Not Available
1.83
11
Allred Rochow Electronegativity
1.22
26
1.42
18
Mulliken-Jaffe Electronegativity
Not Available
1.47
15
Allen Electronegativity
Not Available
1.87
7
Electropositivity
Pauling Electropositivity
2.64
25
2.07
99+
Ionization Energies
1st Energy Level
604.50 kJ/mol
99+
731.00 kJ/mol
27
2nd Energy Level
1,128.00 kJ/mol
99+
2,070.00 kJ/mol
11
3rd Energy Level
1,997.00 kJ/mol
99+
3,361.00 kJ/mol
19
4th Energy Level
3,242.00 kJ/mol
99+
Not Available
Electrochemical Equivalent
1.77 g/amp-hr
39
4.02 g/amp-hr
7
Electron Work Function
Not Available
4.26 eV
20
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Chemical Stability, Ionization, Solubility
Atomic Properties
Atomic Number
93
25
47
99+
Electron Configuration
[Rn] 5f4 6d1 7s2
[Kr] 4d10 5s1
Crystal Structure
Orthorhombic (ORTH)
Face Centered Cubic (FCC)
Crystal Lattice
ORTH-Crystal-Structure-of-Neptunium.jpg#100
FCC-Crystal-Structure-of-Silver.jpg#100
Atom
Number of Protons
93
25
47
99+
Number of Neutrons
144
14
61
99+
Number of Electrons
93
25
47
99+
Radius of an Atom
Atomic Radius
155.00 pm
30
144.00 pm
36
Covalent Radius
190.00 pm
18
145.00 pm
39
Van der Waals Radius
221.00 pm
22
172.00 pm
38
Atomic Weight
237.00 amu
22
107.87 amu
99+
Atomic Volume
11.62 cm3/mol
99+
10.30 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
96.00 (-eV)
9
11.40 (-eV)
99+
Lattice Constant
666.30 pm
3
408.53 pm
20
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
10.49 g/cm3
35
Density When Liquid (at m.p.)
Not Available
9.32 g/cm3
21
Tensile Strength
125.00 MPa
14
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
Not Available
0.00 (Pa)
14
Vapor Pressure at 2000 K
0.11 (Pa)
17
Not Available
Elasticity properties
Shear Modulus
Not Available
30.00 GPa
23
Bulk Modulus
Not Available
100.00 GPa
16
Young's Modulus
Not Available
83.00 GPa
23
Poisson Ratio
Not Available
0.37
7
Other Mechanical Properties
Ductile
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
20.25
6
10.50
26
Magnetic Ordering
Paramagnetic
Diamagnetic
Susceptibility
Not Available
0.00
5
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
1.22 nΩ·m
99+
15.87 nΩ·m
99+
Electrical Conductivity
0.01 106/cm Ω
99+
0.63 106/cm Ω
1
Electron Affinity
Not Available
125.60 kJ/mol
5
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
0.24 J/(kg K)
25
Molar Heat Capacity
29.46 J/mol·K
8
25.35 J/mol·K
99+
Thermal Conductivity
6.30 W/m·K
99+
429.00 W/m·K
1
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
18.90 µm/(m·K)
23
Enthalpy
Enthalpy of Vaporization
Not Available
255.10 kJ/mol
37
Enthalpy of Fusion
3.20 kJ/mol
99+
11.30 kJ/mol
31
Enthalpy of Atomization
Not Available
284.50 kJ/mol
37
Standard Molar Entropy
Not Available
42.60 J/mol.K
35
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