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Silver vs Mendelevium

Silver
Mendelevium
Mendelevium vs Silver


Periodic Table
Symbol
Ag  
Md  
Group Number
11  
7
3  
15
Period Number
5  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440224  
99+
7440111  
99+
Space Group Name
Fm_ 3m  
-  
Space Group Number
225.00  
3
194.00  
7
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.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Earth's crust, Found in Minerals, Ores of metals  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
-  
Lawrence Berkeley National Laboratory  
Discovery
Before 5000 BC  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
27
0.00 %  
40
Abundance In Sun
0.00 %  
26
-  
Abundance In Meteorites
0.00 %  
38
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
0.00 %  
19
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
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 Mendelevium metal are limited to research purpose only.
  
Industrial Uses
Chemical Industry, Clothing Industry, Electrical Industry  
-  
Medical Uses
Dentistry, Pharmaceutical Industry  
-  
Other Uses
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues  
-  
Biological Properties
  
  
Toxicity
Non Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.00 Blood/mg dm-3  
29
0.00 Blood/mg dm-3  
40
In Bone
0.44 p.p.m.  
24
0.00 p.p.m.  
99+
Physical
Melting Point
961.93 °C  
99+
827.00 °C  
99+
Boiling Point
2,212.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
-  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
2.50  
15
-  
Brinell Hardness
251.00 MPa  
99+
350.00 MPa  
36
Vickers Hardness
229.00 MPa  
99+
0.00 MPa  
99+
Speed of Sound
2,680.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
0.16  
99+
1.30  
99+
Reflectivity
97.00 %  
1
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ag  
Md  
Isotopes
  
  
Known Isotopes
36  
3
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.93  
10
1.30  
33
Sanderson Electronegativity
1.83  
14
1.30  
25
Allred Rochow Electronegativity
1.42  
19
1.20  
28
Mulliken-Jaffe Electronegativity
1.47  
28
1.30  
33
Allen Electronegativity
1.87  
10
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.07  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
731.00 kJ/mol  
27
635.00 kJ/mol  
99+
2nd Energy Level
2,070.00 kJ/mol  
11
1,235.00 kJ/mol  
99+
3rd Energy Level
3,361.00 kJ/mol  
19
2,470.00 kJ/mol  
99+
4th Energy Level
7,310.00 kJ/mol  
10
3,840.00 kJ/mol  
99+
5th Energy Level
7,310.00 kJ/mol  
24
6,350.00 kJ/mol  
36
6th Energy Level
7,310.00 kJ/mol  
39
6,350.00 kJ/mol  
99+
7th Energy level
7,310.00 kJ/mol  
33
6,350.00 kJ/mol  
99+
8th Energy Level
7,310.00 kJ/mol  
31
6,350.00 kJ/mol  
99+
9th Energy Level
7,310.00 kJ/mol  
27
6,350.00 kJ/mol  
99+
10th Energy Level
7,310.00 kJ/mol  
32
6,350.00 kJ/mol  
99+
11th Energy Level
7,310.00 kJ/mol  
31
6,400.00 kJ/mol  
99+
12th Energy Level
7,310.00 kJ/mol  
99+
60,100.00 kJ/mol  
16
13th Energy Level
7,310.00 kJ/mol  
25
6,350.00 kJ/mol  
37
14th Energy Level
731.00 kJ/mol  
99+
1,150.00 kJ/mol  
99+
15th Energy Level
73,100.00 kJ/mol  
22
63,500.00 kJ/mol  
37
16th Energy Level
73,100.00 kJ/mol  
17
635.00 kJ/mol  
99+
17th Energy Level
731.00 kJ/mol  
38
1,107.00 kJ/mol  
21
18th Energy Level
7,310.00 kJ/mol  
28
6,350.00 kJ/mol  
39
19th Energy Level
731.00 kJ/mol  
35
635.00 kJ/mol  
99+
20th Energy Level
731.00 kJ/mol  
29
635.00 kJ/mol  
40
21st Energy Level
731.00 kJ/mol  
99+
6,350.00 kJ/mol  
13
22nd Energy Level
731.00 kJ/mol  
23
635.00 kJ/mol  
34
23rd Energy Level
731.00 kJ/mol  
99+
6,350.00 kJ/mol  
13
24th Energy Level
731.00 kJ/mol  
22
635.00 kJ/mol  
36
25th Energy Level
731.00 kJ/mol  
22
635.00 kJ/mol  
38
26th Energy Level
731.00 kJ/mol  
22
635.00 kJ/mol  
37
27th Energy Level
731.00 kJ/mol  
21
635.00 kJ/mol  
39
28th Energy Level
731.00 kJ/mol  
27
635.00 kJ/mol  
99+
29th Energy Level
731.00 kJ/mol  
28
635.00 kJ/mol  
99+
30th Energy Level
731.00 kJ/mol  
22
635.00 kJ/mol  
40
Electrochemical Equivalent
4.02 g/amp-hr  
7
3.21 g/amp-hr  
13
Electron Work Function
4.26 eV  
27
3.89 eV  
37
Other Chemical Properties
Chemical Stability, Ionization, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
47  
99+
101  
17
Electron Configuration
[Kr] 4d10 5s1  
[Rn] 5f13 7s2  
Crystal Structure
Face Centered Cubic (FCC)  
Not Known  
Crystal Lattice
FCC-Crystal-Structure-of-Silver.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
47  
99+
101  
17
Number of Neutrons
61  
99+
157  
8
Number of Electrons
47  
99+
101  
17
Radius of an Atom
  
  
Atomic Radius
144.00 pm  
38
175.00 pm  
21
Covalent Radius
145.00 pm  
99+
175.00 pm  
25
Van der Waals Radius
172.00 pm  
99+
246.00 pm  
12
Atomic Weight
107.87 amu  
99+
258.00 amu  
14
Atomic Volume
10.30 cm3/mol  
99+
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Palladium
  
Fermium
  
Next Element
Cadmium
  
Nobelium
  
Valence Electron Potential
11.40 (-eV)  
99+
63.70 (-eV)  
23
Lattice Constant
408.53 pm  
23
-  
Lattice Angles
π/2, π/2, π/2  
-  
Lattice C/A Ratio
1.59  
26
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
10.49 g/cm3  
37
10.30 g/cm3  
38
Density When Liquid (at m.p.)
9.32 g/cm3  
99+
10.30 g/cm3  
39
Tensile Strength
170.00 MPa  
21
80.00 MPa  
29
Viscosity
0.00  
23
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
14
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
38
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
32.00 GPa  
24
Bulk Modulus
100.00 GPa  
16
0.00 GPa  
99+
Young's Modulus
83.00 GPa  
25
12.00 GPa  
99+
Poisson Ratio
0.37  
7
0.30  
14
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
10.50  
39
13.50  
29
Magnetic Ordering
Diamagnetic  
-  
Permeability
0.00 H/m  
17
0.00 H/m  
11
Susceptibility
0.00  
32
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
15.87 nΩ·m  
99+
0.63 nΩ·m  
99+
Electrical Conductivity
0.63 106/cm Ω  
1
0.00 106/cm Ω  
99+
Electron Affinity
125.60 kJ/mol  
5
50.00 kJ/mol  
26
Thermal
Specific Heat
0.24 J/(kg K)  
25
0.10 J/(kg K)  
99+
Molar Heat Capacity
25.35 J/mol·K  
99+
27.00 J/mol·K  
29
Thermal Conductivity
429.00 W/m·K  
1
0.00 W/m·K  
99+
Critical Temperature
1,235.00 K  
99+
1,100.00 K  
99+
Thermal Expansion
18.90 µm/(m·K)  
25
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
255.10 kJ/mol  
99+
380.50 kJ/mol  
26
Enthalpy of Fusion
11.30 kJ/mol  
37
-  
Enthalpy of Atomization
284.50 kJ/mol  
99+
410.80 kJ/mol  
25
Standard Molar Entropy
42.60 J/mol.K  
99+
37.40 J/mol.K  
99+
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