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Radium vs Cadmium

Radium
Cadmium
Cadmium vs Radium


Periodic Table
Symbol
Ra  
Cd  
Group Number
2  
16
12  
6
Period Number
7  
5  
Block
s block  
d block  
Element Family
Alkaline Earth  
Transition Metal  
CAS Number
7440144  
99+
7440439  
99+
Space Group Name
Im_ 3m  
P63/mmc  
Space Group Number
229.00  
2
194.00  
7
Facts
Interesting Facts
  • Radium metal is the heaviest metal of Alkaline earth metals column.
  • Radium metal is highly radioactive and does not have any stable isotopes.
  
  • 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.
  
Sources
Mining, Ores of metals  
Found As a By-product, Found in Minerals, Mining  
History
  
  
Who Discovered
-  
Karl Samuel Leberecht Hermann and Friedrich Stromeyer  
Discovery
In 1898  
In 1817  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
23
Abundance In Sun
0.00 %  
26
0.00 %  
21
Abundance In Meteorites
-  
0.00 %  
31
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
0.00 %  
28
Abundance In Humans
0.00 %  
23
0.00 %  
12
Uses
Uses & Benefits
  • It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
  • It is used in luminous paints.
  
  • 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.
  
Industrial Uses
-  
Aerospace Industry, Ammunition Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Medical Uses
Pharmaceutical Industry  
-  
Other Uses
-  
Alloys  
Biological Properties
  
  
Toxicity
Highly Toxic  
Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
34
0.01 Blood/mg dm-3  
24
In Bone
0.00 p.p.m.  
99+
1.80 p.p.m.  
16
Physical
Melting Point
700.00 °C  
99+
320.90 °C  
99+
Boiling Point
1,737.00 °C  
99+
765.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery Bluish-Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
1.00  
22
2.00  
17
Brinell Hardness
700.00 MPa  
17
203.00 MPa  
99+
Vickers Hardness
140.00 MPa  
99+
90.00 MPa  
99+
Speed of Sound
3,150.00 m/s  
37
2,310.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.00  
99+
1.71  
26
Reflectivity
83.00 %  
6
67.00 %  
16
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ra  
Cd  
Isotopes
  
  
Known Isotopes
33  
6
34  
5
Electronegativity
  
  
Pauling Electronegativity
0.90  
99+
1.69  
18
Sanderson Electronegativity
0.89  
99+
1.98  
11
Allred Rochow Electronegativity
0.97  
39
1.46  
16
Mulliken-Jaffe Electronegativity
0.92  
99+
1.53  
25
Allen Electronegativity
0.89  
99+
1.52  
30
Electropositivity
  
  
Pauling Electropositivity
3.10  
5
2.31  
37
Ionization Energies
  
  
1st Energy Level
509.30 kJ/mol  
99+
867.80 kJ/mol  
11
2nd Energy Level
979.00 kJ/mol  
99+
1,631.40 kJ/mol  
33
3rd Energy Level
509.30 kJ/mol  
99+
3,616.00 kJ/mol  
13
4th Energy Level
5,093.00 kJ/mol  
27
867.80 kJ/mol  
99+
5th Energy Level
5,090.00 kJ/mol  
99+
4,040.00 kJ/mol  
99+
6th Energy Level
5,090.00 kJ/mol  
99+
8,640.00 kJ/mol  
28
7th Energy level
5,090.00 kJ/mol  
99+
8,640.00 kJ/mol  
24
8th Energy Level
5,090.00 kJ/mol  
99+
8,640.00 kJ/mol  
24
9th Energy Level
5,090.00 kJ/mol  
99+
8,670.00 kJ/mol  
22
10th Energy Level
5,090.00 kJ/mol  
99+
8,650.00 kJ/mol  
25
11th Energy Level
5,090.00 kJ/mol  
99+
8,670.00 kJ/mol  
22
12th Energy Level
5,090.00 kJ/mol  
99+
86,400.00 kJ/mol  
3
13th Energy Level
5,090.00 kJ/mol  
99+
8,640.00 kJ/mol  
17
14th Energy Level
5,090.00 kJ/mol  
99+
8,650.00 kJ/mol  
15
15th Energy Level
50,900.00 kJ/mol  
99+
86,400.00 kJ/mol  
10
16th Energy Level
50,900.00 kJ/mol  
99+
86,400.00 kJ/mol  
10
17th Energy Level
509.30 kJ/mol  
99+
864.90 kJ/mol  
28
18th Energy Level
5,090.00 kJ/mol  
99+
8,670.00 kJ/mol  
17
19th Energy Level
509.30 kJ/mol  
99+
867.80 kJ/mol  
26
20th Energy Level
509.00 kJ/mol  
99+
865.00 kJ/mol  
16
21st Energy Level
509.30 kJ/mol  
99+
8,670.00 kJ/mol  
10
22nd Energy Level
509.00 kJ/mol  
99+
864.00 kJ/mol  
14
23rd Energy Level
509.30 kJ/mol  
99+
864.90 kJ/mol  
40
24th Energy Level
509.30 kJ/mol  
99+
864.90 kJ/mol  
10
25th Energy Level
509.00 kJ/mol  
99+
864.00 kJ/mol  
8
26th Energy Level
509.30 kJ/mol  
99+
864.90 kJ/mol  
8
27th Energy Level
509.30 kJ/mol  
99+
864.90 kJ/mol  
8
28th Energy Level
509.30 kJ/mol  
99+
864.90 kJ/mol  
11
29th Energy Level
509.30 kJ/mol  
99+
864.90 kJ/mol  
12
30th Energy Level
509.00 kJ/mol  
99+
864.00 kJ/mol  
8
Electrochemical Equivalent
4.22 g/amp-hr  
6
2.10 g/amp-hr  
31
Electron Work Function
4.30 eV  
25
4.22 eV  
29
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
88  
30
48  
99+
Electron Configuration
[Rn] 7s2  
[Kr] 4d10 5s2  
Crystal Structure
Body Centered Cubic (BCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
HCP-Crystal-Structure-of-Cadmium.jpg#100  
Atom
  
  
Number of Protons
88  
30
48  
99+
Number of Neutrons
138  
17
64  
99+
Number of Electrons
88  
30
48  
99+
Radius of an Atom
  
  
Atomic Radius
215.00 pm  
6
151.00 pm  
34
Covalent Radius
221.00 pm  
3
144.00 pm  
99+
Van der Waals Radius
283.00 pm  
5
158.00 pm  
99+
Atomic Weight
226.00 amu  
26
112.41 amu  
99+
Atomic Volume
45.20 cm3/mol  
5
13.10 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Francium
  
Silver
  
Next Element
Actinium
  
Indium
  
Valence Electron Potential
20.10 (-eV)  
99+
30.00 (-eV)  
99+
Lattice Constant
514.80 pm  
15
297.94 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.57  
99+
1.89  
2
Mechanical
Density
  
  
Density At Room Temperature
5.50 g/cm3  
99+
8.65 g/cm3  
99+
Density When Liquid (at m.p.)
5.50 g/cm3  
99+
8.00 g/cm3  
99+
Tensile Strength
40.00 MPa  
99+
62.00 MPa  
34
Viscosity
0.00  
2
0.00  
13
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
16
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
33
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
19.00 GPa  
99+
Bulk Modulus
43.00 GPa  
33
42.00 GPa  
34
Young's Modulus
83.00 GPa  
25
50.00 GPa  
39
Poisson Ratio
0.31  
13
0.30  
14
Other Mechanical Properties
-  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
5.00  
99+
8.65  
99+
Magnetic Ordering
Nonmagnetic  
Diamagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
10
Susceptibility
0.00  
18
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Semiconductor  
Resistivity
100.00 nΩ·m  
31
72.70 nΩ·m  
36
Electrical Conductivity
0.00 106/cm Ω  
99+
0.14 106/cm Ω  
17
Electron Affinity
0.90 kJ/mol  
99+
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.23 J/(kg K)  
26
Molar Heat Capacity
20.05 J/mol·K  
99+
26.02 J/mol·K  
40
Thermal Conductivity
18.60 W/m·K  
99+
96.60 W/m·K  
16
Critical Temperature
973.00 K  
99+
594.00 K  
99+
Thermal Expansion
8.50 µm/(m·K)  
99+
30.80 µm/(m·K)  
10
Enthalpy
  
  
Enthalpy of Vaporization
113.00 kJ/mol  
99+
100.00 kJ/mol  
99+
Enthalpy of Fusion
8.60 kJ/mol  
99+
6.19 kJ/mol  
99+
Enthalpy of Atomization
163.00 kJ/mol  
99+
113.00 kJ/mol  
99+
Standard Molar Entropy
71.00 J/mol.K  
14
51.80 J/mol.K  
38
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