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Cadmium vs Francium

Cadmium
Francium
Francium vs Cadmium


Periodic Table
Symbol
Cd  
Fr  
Group Number
12  
6
1  
17
Period Number
5  
7  
Block
d block  
s block  
Element Family
Transition Metal  
Alkali  
CAS Number
7440439  
99+
7440735  
18
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
225.00  
3
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.
  
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
Sources
Found As a By-product, Found in Minerals, Mining  
Formed by Decay Process, Mining  
History
  
  
Who Discovered
Karl Samuel Leberecht Hermann and Friedrich Stromeyer  
Marguerite Perey  
Discovery
In 1817  
In 1939  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
40
Abundance In Sun
0.00 %  
21
0.00 %  
30
Abundance In Meteorites
0.00 %  
31
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
99+
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.
  
  • Francium has no known uses as it has a half life of only 22 minutes.
  
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+
27.00 °C  
99+
Boiling Point
765.00 °C  
99+
677.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Bluish-Gray  
-  
Luster
Metallic  
-  
Hardness
  
  
Mohs Hardness
2.00  
17
0.20  
27
Brinell Hardness
203.00 MPa  
99+
119.00 MPa  
99+
Vickers Hardness
90.00 MPa  
99+
300.00 MPa  
99+
Speed of Sound
2,310.00 m/s  
99+
2,440.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.71  
26
1.70  
27
Reflectivity
67.00 %  
16
72.00 %  
11
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cd  
Fr  
Isotopes
  
  
Known Isotopes
34  
5
33  
6
Electronegativity
  
  
Pauling Electronegativity
1.69  
18
0.70  
99+
Sanderson Electronegativity
1.98  
11
0.70  
99+
Allred Rochow Electronegativity
1.46  
16
0.86  
99+
Mulliken-Jaffe Electronegativity
1.53  
25
0.68  
99+
Allen Electronegativity
1.52  
30
0.67  
99+
Electropositivity
  
  
Pauling Electropositivity
2.31  
37
3.30  
1
Ionization Energies
  
  
1st Energy Level
867.80 kJ/mol  
11
380.00 kJ/mol  
99+
2nd Energy Level
1,631.40 kJ/mol  
33
392.80 kJ/mol  
99+
3rd Energy Level
3,616.00 kJ/mol  
13
392.80 kJ/mol  
99+
4th Energy Level
867.80 kJ/mol  
99+
392.80 kJ/mol  
99+
5th Energy Level
4,040.00 kJ/mol  
99+
392.00 kJ/mol  
99+
6th Energy Level
8,640.00 kJ/mol  
28
3,920.00 kJ/mol  
99+
7th Energy level
8,640.00 kJ/mol  
24
3,920.00 kJ/mol  
99+
8th Energy Level
8,640.00 kJ/mol  
24
3,920.00 kJ/mol  
99+
9th Energy Level
8,670.00 kJ/mol  
22
3,920.00 kJ/mol  
99+
10th Energy Level
8,650.00 kJ/mol  
25
392.00 kJ/mol  
99+
11th Energy Level
8,670.00 kJ/mol  
22
392.00 kJ/mol  
99+
12th Energy Level
86,400.00 kJ/mol  
3
38,000.00 kJ/mol  
23
13th Energy Level
8,640.00 kJ/mol  
17
3,920.00 kJ/mol  
99+
14th Energy Level
8,650.00 kJ/mol  
15
380.00 kJ/mol  
99+
15th Energy Level
86,400.00 kJ/mol  
10
67,700.00 kJ/mol  
32
16th Energy Level
86,400.00 kJ/mol  
10
39,200.00 kJ/mol  
99+
17th Energy Level
864.90 kJ/mol  
28
392.00 kJ/mol  
99+
18th Energy Level
8,670.00 kJ/mol  
17
3,920.00 kJ/mol  
99+
19th Energy Level
867.80 kJ/mol  
26
392.80 kJ/mol  
99+
20th Energy Level
865.00 kJ/mol  
16
392.00 kJ/mol  
99+
21st Energy Level
8,670.00 kJ/mol  
10
392.00 kJ/mol  
99+
22nd Energy Level
864.00 kJ/mol  
14
392.00 kJ/mol  
99+
23rd Energy Level
864.90 kJ/mol  
40
392.80 kJ/mol  
99+
24th Energy Level
864.90 kJ/mol  
10
392.00 kJ/mol  
99+
25th Energy Level
864.00 kJ/mol  
8
392.00 kJ/mol  
99+
26th Energy Level
864.90 kJ/mol  
8
392.80 kJ/mol  
99+
27th Energy Level
864.90 kJ/mol  
8
392.00 kJ/mol  
99+
28th Energy Level
864.90 kJ/mol  
11
380.00 kJ/mol  
99+
29th Energy Level
864.90 kJ/mol  
12
392.00 kJ/mol  
99+
30th Energy Level
864.00 kJ/mol  
8
677.00 kJ/mol  
31
Electrochemical Equivalent
2.10 g/amp-hr  
31
8.32 g/amp-hr  
1
Electron Work Function
4.22 eV  
29
4.07 eV  
33
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
48  
99+
87  
31
Electron Configuration
[Kr] 4d10 5s2  
[Rn] 7s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Body Centered Cubic (BCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Cadmium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
48  
99+
87  
31
Number of Neutrons
64  
99+
136  
18
Number of Electrons
48  
99+
87  
31
Radius of an Atom
  
  
Atomic Radius
151.00 pm  
34
348.00 pm  
1
Covalent Radius
144.00 pm  
99+
260.00 pm  
1
Van der Waals Radius
158.00 pm  
99+
348.00 pm  
1
Atomic Weight
112.41 amu  
99+
223.00 amu  
27
Atomic Volume
13.10 cm3/mol  
99+
71.00 cm3/mol  
2
Adjacent Atomic Numbers
  
  
Previous Element
Silver
  
Polonium
  
Next Element
Indium
  
Radium
  
Valence Electron Potential
30.00 (-eV)  
99+
8.00 (-eV)  
99+
Lattice Constant
297.94 pm  
99+
440.00 pm  
21
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.89  
2
1.56  
99+
Mechanical
Density
  
  
Density At Room Temperature
8.65 g/cm3  
99+
1.87 g/cm3  
99+
Density When Liquid (at m.p.)
8.00 g/cm3  
99+
1.87 g/cm3  
99+
Tensile Strength
62.00 MPa  
34
50.00 MPa  
38
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)  
24
Elasticity properties
  
  
Shear Modulus
19.00 GPa  
99+
3.60 GPa  
99+
Bulk Modulus
42.00 GPa  
34
6.00 GPa  
99+
Young's Modulus
50.00 GPa  
39
0.00 GPa  
99+
Poisson Ratio
0.30  
14
0.44  
3
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
8.65  
99+
0.87  
99+
Magnetic Ordering
Diamagnetic  
Paramagnetic  
Permeability
0.00 H/m  
10
0.00 H/m  
13
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Semiconductor  
Poor Conductor  
Resistivity
72.70 nΩ·m  
36
3.00 nΩ·m  
99+
Electrical Conductivity
0.14 106/cm Ω  
17
0.03 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
0.70 kJ/mol  
99+
Thermal
Specific Heat
0.23 J/(kg K)  
26
0.15 J/(kg K)  
37
Molar Heat Capacity
26.02 J/mol·K  
40
27.00 J/mol·K  
29
Thermal Conductivity
96.60 W/m·K  
16
15.00 W/m·K  
99+
Critical Temperature
594.00 K  
99+
300.00 K  
99+
Thermal Expansion
30.80 µm/(m·K)  
10
18.90 µm/(m·K)  
25
Enthalpy
  
  
Enthalpy of Vaporization
100.00 kJ/mol  
99+
67.00 kJ/mol  
99+
Enthalpy of Fusion
6.19 kJ/mol  
99+
2.30 kJ/mol  
99+
Enthalpy of Atomization
113.00 kJ/mol  
99+
71.00 kJ/mol  
99+
Standard Molar Entropy
51.80 J/mol.K  
38
42.00 J/mol.K  
99+
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