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Cadmium vs Mendelevium

Cadmium
Mendelevium
Mendelevium vs Cadmium


Periodic Table
Symbol
Cd  
Md  
Group Number
12  
6
3  
15
Period Number
5  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440439  
99+
7440111  
99+
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Naturally occurring minor elements include Cadmium.
  • Cadmium is released into atmosphere to control volcanic eruption and forest fires.
  • It is used for electroplating of Steel for corrosion resistance.
  • It can absorb neutrons and used in nuclear reactor to control atomic fission.
  
  • Mendelevium metal is synthetically produced metal.
  • Mendelevium metal has been produced in only trace amount.
  
Sources
Found As a By-product, Found in Minerals, Mining  
Bombarding Einsteinium with Helium Ions  
History
  
  
Who Discovered
Karl Samuel Leberecht Hermann and Friedrich Stromeyer  
Lawrence Berkeley National Laboratory  
Discovery
In 1817  
In 1955  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
40
Abundance In Sun
0.00 %  
21
-  
Abundance In Meteorites
0.00 %  
31
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
0.00 %  
28
-  
Abundance In Humans
0.00 %  
12
0.00 %  
24
Uses
Uses & Benefits
  • It has very limited uses as it is a toxic metal and it can cause birth defects, cancer, etc.
  • Almost 80% of Cadmium metal is used in Nickel cadmium Batteries and now it is getting replaced with nickel hydride.
  
  • Currently known uses of Mendelevium metal are limited to research purpose only.
  
Industrial Uses
Aerospace Industry, Ammunition Industry, Chemical Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
-  
Biological Properties
  
  
Toxicity
Toxic  
-  
Present in Human Body
Yes  
No  
In Blood
0.01 Blood/mg dm-3  
24
0.00 Blood/mg dm-3  
40
In Bone
1.80 p.p.m.  
16
0.00 p.p.m.  
99+
Physical
Melting Point
320.90 °C  
99+
827.00 °C  
99+
Boiling Point
765.00 °C  
99+
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Bluish-Gray  
-  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
2.00  
17
-  
Brinell Hardness
203.00 MPa  
99+
350.00 MPa  
36
Vickers Hardness
90.00 MPa  
99+
0.00 MPa  
99+
Speed of Sound
2,310.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.71  
26
1.30  
99+
Reflectivity
67.00 %  
16
66.00 %  
17
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cd  
Md  
Isotopes
  
  
Known Isotopes
34  
5
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.69  
18
1.30  
33
Sanderson Electronegativity
1.98  
11
1.30  
25
Allred Rochow Electronegativity
1.46  
16
1.20  
28
Mulliken-Jaffe Electronegativity
1.53  
25
1.30  
33
Allen Electronegativity
1.52  
30
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.31  
37
2.70  
22
Ionization Energies
  
  
1st Energy Level
867.80 kJ/mol  
11
635.00 kJ/mol  
99+
2nd Energy Level
1,631.40 kJ/mol  
33
1,235.00 kJ/mol  
99+
3rd Energy Level
3,616.00 kJ/mol  
13
2,470.00 kJ/mol  
99+
4th Energy Level
867.80 kJ/mol  
99+
3,840.00 kJ/mol  
99+
5th Energy Level
4,040.00 kJ/mol  
99+
6,350.00 kJ/mol  
36
6th Energy Level
8,640.00 kJ/mol  
28
6,350.00 kJ/mol  
99+
7th Energy level
8,640.00 kJ/mol  
24
6,350.00 kJ/mol  
99+
8th Energy Level
8,640.00 kJ/mol  
24
6,350.00 kJ/mol  
99+
9th Energy Level
8,670.00 kJ/mol  
22
6,350.00 kJ/mol  
99+
10th Energy Level
8,650.00 kJ/mol  
25
6,350.00 kJ/mol  
99+
11th Energy Level
8,670.00 kJ/mol  
22
6,400.00 kJ/mol  
99+
12th Energy Level
86,400.00 kJ/mol  
3
60,100.00 kJ/mol  
16
13th Energy Level
8,640.00 kJ/mol  
17
6,350.00 kJ/mol  
37
14th Energy Level
8,650.00 kJ/mol  
15
1,150.00 kJ/mol  
99+
15th Energy Level
86,400.00 kJ/mol  
10
63,500.00 kJ/mol  
37
16th Energy Level
86,400.00 kJ/mol  
10
635.00 kJ/mol  
99+
17th Energy Level
864.90 kJ/mol  
28
1,107.00 kJ/mol  
21
18th Energy Level
8,670.00 kJ/mol  
17
6,350.00 kJ/mol  
39
19th Energy Level
867.80 kJ/mol  
26
635.00 kJ/mol  
99+
20th Energy Level
865.00 kJ/mol  
16
635.00 kJ/mol  
40
21st Energy Level
8,670.00 kJ/mol  
10
6,350.00 kJ/mol  
13
22nd Energy Level
864.00 kJ/mol  
14
635.00 kJ/mol  
34
23rd Energy Level
864.90 kJ/mol  
40
6,350.00 kJ/mol  
13
24th Energy Level
864.90 kJ/mol  
10
635.00 kJ/mol  
36
25th Energy Level
864.00 kJ/mol  
8
635.00 kJ/mol  
38
26th Energy Level
864.90 kJ/mol  
8
635.00 kJ/mol  
37
27th Energy Level
864.90 kJ/mol  
8
635.00 kJ/mol  
39
28th Energy Level
864.90 kJ/mol  
11
635.00 kJ/mol  
99+
29th Energy Level
864.90 kJ/mol  
12
635.00 kJ/mol  
99+
30th Energy Level
864.00 kJ/mol  
8
635.00 kJ/mol  
40
Electrochemical Equivalent
2.10 g/amp-hr  
31
3.21 g/amp-hr  
13
Electron Work Function
4.22 eV  
29
3.89 eV  
37
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
48  
99+
101  
17
Electron Configuration
[Kr] 4d10 5s2  
[Rn] 5f13 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Not Known  
Crystal Lattice
HCP-Crystal-Structure-of-Cadmium.jpg#100  
Unknown-Crystal-Structure-of-Mendelevium.jpg#100  
Atom
  
  
Number of Protons
48  
99+
101  
17
Number of Neutrons
64  
99+
157  
8
Number of Electrons
48  
99+
101  
17
Radius of an Atom
  
  
Atomic Radius
151.00 pm  
34
175.00 pm  
21
Covalent Radius
144.00 pm  
99+
175.00 pm  
25
Van der Waals Radius
158.00 pm  
99+
246.00 pm  
12
Atomic Weight
112.41 amu  
99+
258.00 amu  
14
Atomic Volume
13.10 cm3/mol  
99+
19.90 cm3/mol  
32
Adjacent Atomic Numbers
  
  
Previous Element
Silver
  
Fermium
  
Next Element
Indium
  
Nobelium
  
Valence Electron Potential
30.00 (-eV)  
99+
63.70 (-eV)  
23
Lattice Constant
297.94 pm  
99+
-  
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.89  
2
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
8.65 g/cm3  
99+
10.30 g/cm3  
38
Density When Liquid (at m.p.)
8.00 g/cm3  
99+
10.30 g/cm3  
39
Tensile Strength
62.00 MPa  
34
80.00 MPa  
29
Viscosity
0.00  
13
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
37
Elasticity properties
  
  
Shear Modulus
19.00 GPa  
99+
32.00 GPa  
24
Bulk Modulus
42.00 GPa  
34
0.00 GPa  
99+
Young's Modulus
50.00 GPa  
39
12.00 GPa  
99+
Poisson Ratio
0.30  
14
0.30  
14
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
8.65  
99+
13.50  
29
Magnetic Ordering
Diamagnetic  
-  
Permeability
0.00 H/m  
10
0.00 H/m  
11
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Semiconductor  
-  
Resistivity
72.70 nΩ·m  
36
0.63 nΩ·m  
99+
Electrical Conductivity
0.14 106/cm Ω  
17
0.00 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
50.00 kJ/mol  
26
Thermal
Specific Heat
0.23 J/(kg K)  
26
0.10 J/(kg K)  
99+
Molar Heat Capacity
26.02 J/mol·K  
40
27.00 J/mol·K  
29
Thermal Conductivity
96.60 W/m·K  
16
0.00 W/m·K  
99+
Critical Temperature
594.00 K  
99+
1,100.00 K  
99+
Thermal Expansion
30.80 µm/(m·K)  
10
11.60 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
100.00 kJ/mol  
99+
380.50 kJ/mol  
26
Enthalpy of Fusion
6.19 kJ/mol  
99+
-  
Enthalpy of Atomization
113.00 kJ/mol  
99+
410.80 kJ/mol  
25
Standard Molar Entropy
51.80 J/mol.K  
38
37.40 J/mol.K  
99+
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