Silver vs Neptunium
Periodic Table
Symbol
Ag
Np
Group Number
11
7
Not Available
Period Number
5
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
7440224
99+
7439998
99+
Space Group Name
Fm_ 3m
Pnma
Space Group Number
225.00
2
62.00
11
Facts
Interesting Facts
- 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.
Not Available
Sources
Earth's crust, Found in Minerals, Ores of metals
Made by Bombarding Uranium with Neutrons, Ores of metals
History
Who Discovered
Unknown
Edwin McMillan and Philip H. Abelson
Discovery
Before 5000 BC
In 1940
Abundance
Abundance In Universe
6 * 10-8 %
26
Not Available
Abundance In Sun
~0.0000001 %
26
~-9999 %
Abundance In Meteorites
0.00 %
38
Not Available
Abundance In Earth's Crust
0.00 %
99+
Not Available
Abundance In Oceans
0.00 %
19
Not Available
Uses
Uses & Benefits
- Silver is mainly used for Jewelry and show piece.
- It is used for manufacturing high quality mirrors due to its reflectivity property.
- 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
Chemical Industry, Clothing Industry, Electrical Industry
NA
Medical Uses
Dentistry, Pharmaceutical Industry
NA
Other Uses
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues
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
29
0.00 Blood/mg dm-3
37
In Bone
0.44 p.p.m.
20
0.00 p.p.m.
36
Physical Properties
Melting Point
961.93 °C
99+
640.00 °C
99+
Boiling Point
2,212.00 °C
99+
3,902.00 °C
13
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silver
Luster
Metallic
Metallic
Hardness
Mohs Hardness
2.50
14
Not Available
Brinell Hardness
251.00 MPa
37
Not Available
Vickers Hardness
229.00 MPa
30
Not Available
Speed of Sound
2,680.00 m/s
34
Not Available
Optical Properties
Reflectivity
97.00 %
1
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
Ag
Np
Isotopes
Known Isotopes
36
3
20
19
Electronegativity
Pauling Electronegativity
1.93
9
1.36
29
Sanderson Electronegativity
1.83
11
Not Available
Allred Rochow Electronegativity
1.42
18
1.22
26
Mulliken-Jaffe Electronegativity
1.47
15
Not Available
Allen Electronegativity
1.87
7
Not Available
Electropositivity
Pauling Electropositivity
2.07
99+
2.64
25
Ionization Energies
1st Energy Level
731.00 kJ/mol
27
604.50 kJ/mol
99+
2nd Energy Level
2,070.00 kJ/mol
11
1,128.00 kJ/mol
99+
3rd Energy Level
3,361.00 kJ/mol
19
1,997.00 kJ/mol
99+
4th Energy Level
Not Available
3,242.00 kJ/mol
99+
Electrochemical Equivalent
4.02 g/amp-hr
7
1.77 g/amp-hr
39
Electron Work Function
4.26 eV
20
Not Available
Other Chemical Properties
Chemical Stability, Ionization, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
47
99+
93
25
Electron Configuration
[Kr] 4d10 5s1
[Rn] 5f4 6d1 7s2
Crystal Structure
Face Centered Cubic (FCC)
Orthorhombic (ORTH)
Crystal Lattice
FCC-Crystal-Structure-of-Silver.jpg#100
ORTH-Crystal-Structure-of-Neptunium.jpg#100
Atom
Number of Protons
47
99+
93
25
Number of Neutrons
61
99+
144
14
Number of Electrons
47
99+
93
25
Radius of an Atom
Atomic Radius
144.00 pm
36
155.00 pm
30
Covalent Radius
145.00 pm
39
190.00 pm
18
Van der Waals Radius
172.00 pm
38
221.00 pm
22
Atomic Weight
107.87 amu
99+
237.00 amu
22
Atomic Volume
10.30 cm3/mol
99+
11.62 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
11.40 (-eV)
99+
96.00 (-eV)
9
Lattice Constant
408.53 pm
20
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
10.49 g/cm3
35
19.38 g/cm3
14
Density When Liquid (at m.p.)
9.32 g/cm3
21
Not Available
Tensile Strength
Not Available
125.00 MPa
14
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
14
Not Available
Vapor Pressure at 2000 K
Not Available
0.11 (Pa)
17
Elasticity properties
Shear Modulus
30.00 GPa
23
Not Available
Bulk Modulus
100.00 GPa
16
Not Available
Young's Modulus
83.00 GPa
23
Not Available
Poisson Ratio
0.37
7
Not Available
Other Mechanical Properties
Ductile, Malleable
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
10.50
26
20.25
6
Magnetic Ordering
Diamagnetic
Paramagnetic
Susceptibility
0.00
5
Not Available
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
15.87 nΩ·m
99+
1.22 nΩ·m
99+
Electrical Conductivity
0.63 106/cm Ω
1
0.01 106/cm Ω
99+
Electron Affinity
125.60 kJ/mol
5
Not Available
Thermal Properties
Specific Heat
0.24 J/(kg K)
25
0.12 J/(kg K)
40
Molar Heat Capacity
25.35 J/mol·K
99+
29.46 J/mol·K
8
Thermal Conductivity
429.00 W/m·K
1
6.30 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
18.90 µm/(m·K)
23
Not Available
Enthalpy
Enthalpy of Vaporization
255.10 kJ/mol
37
Not Available
Enthalpy of Fusion
11.30 kJ/mol
31
3.20 kJ/mol
99+
Enthalpy of Atomization
284.50 kJ/mol
37
Not Available
Standard Molar Entropy
42.60 J/mol.K
35
Not Available
|
||
|
||
|
