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Radium vs Rhodium

Radium
Rhodium
Rhodium vs Radium


Periodic Table
Symbol
Ra  
Rh  
Group Number
2  
16
9  
9
Period Number
7  
5  
Block
s block  
d block  
Element Family
Alkaline Earth  
Transition Metal  
CAS Number
7440144  
99+
7440166  
99+
Space Group Name
Im_ 3m  
Fm_ 3m  
Space Group Number
229.00  
2
225.00  
3
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.
  
  • Rhodium is the rarest element out of all non-radioactive metals on the earth .
  • Rhodium is one of the most durable and hard metal, which also have high reflectance.
  
Sources
Mining, Ores of metals  
Earth's crust, Found As a By-product, Found in Minerals, Mining  
History
  
  
Who Discovered
-  
William Hyde Wollaston  
Discovery
In 1898  
In 1804  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
27
Abundance In Sun
0.00 %  
26
0.00 %  
25
Abundance In Meteorites
-  
0.00 %  
36
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
99+
-  
Abundance In Humans
0.00 %  
23
0.00 %  
24
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.
  
  • Rhodium metal is mainly used in catalytic converters for cars as it reduces nitrogen oxides in exhaust gases.
  • It is used as an industrial catalyst for nitric acid, acetic acid, hydrogenation reaction, etc.
  
Industrial Uses
-  
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
Pharmaceutical Industry  
-  
Other Uses
-  
Alloys  
Biological Properties
  
  
Toxicity
Highly Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
34
0.00 Blood/mg dm-3  
37
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
700.00 °C  
99+
1,966.00 °C  
12
Boiling Point
1,737.00 °C  
99+
3,727.00 °C  
17
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
1.00  
22
6.00  
6
Brinell Hardness
700.00 MPa  
17
980.00 MPa  
10
Vickers Hardness
140.00 MPa  
99+
1,100.00 MPa  
15
Speed of Sound
3,150.00 m/s  
37
4,700.00 m/s  
19
Optical Properties
  
  
Refractive Index
1.00  
99+
2.40  
7
Reflectivity
83.00 %  
6
84.00 %  
5
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ra  
Rh  
Isotopes
  
  
Known Isotopes
33  
6
16  
23
Electronegativity
  
  
Pauling Electronegativity
0.90  
99+
2.28  
4
Sanderson Electronegativity
0.89  
99+
2.28  
5
Allred Rochow Electronegativity
0.97  
39
1.45  
17
Mulliken-Jaffe Electronegativity
0.92  
99+
2.28  
4
Allen Electronegativity
0.89  
99+
1.56  
27
Electropositivity
  
  
Pauling Electropositivity
3.10  
5
1.72  
99+
Ionization Energies
  
  
1st Energy Level
509.30 kJ/mol  
99+
719.70 kJ/mol  
29
2nd Energy Level
979.00 kJ/mol  
99+
1,740.00 kJ/mol  
27
3rd Energy Level
509.30 kJ/mol  
99+
2,997.00 kJ/mol  
27
4th Energy Level
5,093.00 kJ/mol  
27
7,197.00 kJ/mol  
11
5th Energy Level
5,090.00 kJ/mol  
99+
7,197.00 kJ/mol  
26
6th Energy Level
5,090.00 kJ/mol  
99+
7,197.00 kJ/mol  
40
7th Energy level
5,090.00 kJ/mol  
99+
7,197.00 kJ/mol  
35
8th Energy Level
5,090.00 kJ/mol  
99+
3,480.00 kJ/mol  
99+
9th Energy Level
5,090.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
10th Energy Level
5,090.00 kJ/mol  
99+
7,197.00 kJ/mol  
33
11th Energy Level
5,090.00 kJ/mol  
99+
7,197.00 kJ/mol  
32
12th Energy Level
5,090.00 kJ/mol  
99+
7,190.00 kJ/mol  
99+
13th Energy Level
5,090.00 kJ/mol  
99+
7,190.00 kJ/mol  
27
14th Energy Level
5,090.00 kJ/mol  
99+
7,197.00 kJ/mol  
21
15th Energy Level
50,900.00 kJ/mol  
99+
71,900.00 kJ/mol  
23
16th Energy Level
50,900.00 kJ/mol  
99+
71,900.00 kJ/mol  
18
17th Energy Level
509.30 kJ/mol  
99+
719.70 kJ/mol  
39
18th Energy Level
5,090.00 kJ/mol  
99+
7,197.00 kJ/mol  
29
19th Energy Level
509.30 kJ/mol  
99+
719.70 kJ/mol  
36
20th Energy Level
509.00 kJ/mol  
99+
719.00 kJ/mol  
30
21st Energy Level
509.30 kJ/mol  
99+
719.70 kJ/mol  
99+
22nd Energy Level
509.00 kJ/mol  
99+
719.00 kJ/mol  
24
23rd Energy Level
509.30 kJ/mol  
99+
719.70 kJ/mol  
99+
24th Energy Level
509.30 kJ/mol  
99+
719.70 kJ/mol  
23
25th Energy Level
509.00 kJ/mol  
99+
719.00 kJ/mol  
23
26th Energy Level
509.30 kJ/mol  
99+
719.70 kJ/mol  
23
27th Energy Level
509.30 kJ/mol  
99+
719.70 kJ/mol  
22
28th Energy Level
509.30 kJ/mol  
99+
719.70 kJ/mol  
28
29th Energy Level
509.30 kJ/mol  
99+
719.70 kJ/mol  
29
30th Energy Level
509.00 kJ/mol  
99+
719.00 kJ/mol  
23
Electrochemical Equivalent
4.22 g/amp-hr  
6
1.28 g/amp-hr  
99+
Electron Work Function
4.30 eV  
25
4.98 eV  
10
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity  
Anti Corrosion, Ionization, Radioactive Isotopes  
Atomic
Atomic Number
88  
30
45  
99+
Electron Configuration
[Rn] 7s2  
[Kr] 4d8 5s1  
Crystal Structure
Body Centered Cubic (BCC)  
Face Centered Cubic (FCC)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
FCC-Crystal-Structure-of-Rhodium.jpg#100  
Atom
  
  
Number of Protons
88  
30
45  
99+
Number of Neutrons
138  
17
58  
99+
Number of Electrons
88  
30
45  
99+
Radius of an Atom
  
  
Atomic Radius
215.00 pm  
6
134.00 pm  
99+
Covalent Radius
221.00 pm  
3
142.00 pm  
99+
Van der Waals Radius
283.00 pm  
5
200.00 pm  
35
Atomic Weight
226.00 amu  
26
102.91 amu  
99+
Atomic Volume
45.20 cm3/mol  
5
8.30 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Francium
  
Ruthenium
  
Next Element
Actinium
  
Palladium
  
Valence Electron Potential
20.10 (-eV)  
99+
64.00 (-eV)  
22
Lattice Constant
514.80 pm  
15
380.34 pm  
30
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.57  
99+
1.73  
7
Mechanical
Density
  
  
Density At Room Temperature
5.50 g/cm3  
99+
12.41 g/cm3  
30
Density When Liquid (at m.p.)
5.50 g/cm3  
99+
10.70 g/cm3  
35
Tensile Strength
40.00 MPa  
99+
951.00 MPa  
5
Viscosity
0.00  
2
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
16
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
33
0.02 (Pa)  
19
Elasticity properties
  
  
Shear Modulus
25.00 GPa  
38
150.00 GPa  
6
Bulk Modulus
43.00 GPa  
33
275.00 GPa  
5
Young's Modulus
83.00 GPa  
25
380.00 GPa  
5
Poisson Ratio
0.31  
13
0.26  
22
Other Mechanical Properties
-  
Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
5.00  
99+
12.41  
32
Magnetic Ordering
Nonmagnetic  
Paramagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
17
Susceptibility
0.00  
18
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
100.00 nΩ·m  
31
43.30 nΩ·m  
99+
Electrical Conductivity
0.00 106/cm Ω  
99+
0.21 106/cm Ω  
8
Electron Affinity
0.90 kJ/mol  
99+
109.70 kJ/mol  
8
Thermal
Specific Heat
0.12 J/(kg K)  
99+
0.24 J/(kg K)  
22
Molar Heat Capacity
20.05 J/mol·K  
99+
24.98 J/mol·K  
99+
Thermal Conductivity
18.60 W/m·K  
99+
150.00 W/m·K  
9
Critical Temperature
973.00 K  
99+
2,237.00 K  
13
Thermal Expansion
8.50 µm/(m·K)  
99+
8.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
113.00 kJ/mol  
99+
495.40 kJ/mol  
16
Enthalpy of Fusion
8.60 kJ/mol  
99+
21.76 kJ/mol  
10
Enthalpy of Atomization
163.00 kJ/mol  
99+
556.50 kJ/mol  
16
Standard Molar Entropy
71.00 J/mol.K  
14
31.50 J/mol.K  
99+
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