Home
 Compare Metals

Rhodium vs Radium

Rhodium
Radium
Radium vs Rhodium


Periodic Table
Symbol
Rh  
Ra  
Group Number
9  
9
2  
16
Period Number
5  
7  
Block
d block  
s block  
Element Family
Transition Metal  
Alkaline Earth  
CAS Number
7440166  
99+
7440144  
99+
Space Group Name
Fm_ 3m  
Im_ 3m  
Space Group Number
225.00  
3
229.00  
2
Facts
Interesting Facts
  • 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.
  
  • Radium metal is the heaviest metal of Alkaline earth metals column.
  • Radium metal is highly radioactive and does not have any stable isotopes.
  
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining  
Mining, Ores of metals  
History
  
  
Who Discovered
William Hyde Wollaston  
-  
Discovery
In 1804  
In 1898  
Abundance
  
  
Abundance In Universe
0.00 %  
27
0.00 %  
40
Abundance In Sun
0.00 %  
25
0.00 %  
26
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 %  
24
0.00 %  
23
Uses
Uses & Benefits
  • 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.
  
  • It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
  • It is used in luminous paints.
  
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  
37
0.00 Blood/mg dm-3  
34
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,966.00 °C  
12
700.00 °C  
99+
Boiling Point
3,727.00 °C  
17
1,737.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
1.00  
22
Brinell Hardness
980.00 MPa  
10
700.00 MPa  
17
Vickers Hardness
1,100.00 MPa  
15
140.00 MPa  
99+
Speed of Sound
4,700.00 m/s  
19
3,150.00 m/s  
37
Optical Properties
  
  
Refractive Index
2.40  
7
1.00  
99+
Reflectivity
84.00 %  
5
83.00 %  
6
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rh  
Ra  
Isotopes
  
  
Known Isotopes
16  
23
33  
6
Electronegativity
  
  
Pauling Electronegativity
2.28  
4
0.90  
99+
Sanderson Electronegativity
2.28  
5
0.89  
99+
Allred Rochow Electronegativity
1.45  
17
0.97  
39
Mulliken-Jaffe Electronegativity
2.28  
4
0.92  
99+
Allen Electronegativity
1.56  
27
0.89  
99+
Electropositivity
  
  
Pauling Electropositivity
1.72  
99+
3.10  
5
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol  
29
509.30 kJ/mol  
99+
2nd Energy Level
1,740.00 kJ/mol  
27
979.00 kJ/mol  
99+
3rd Energy Level
2,997.00 kJ/mol  
27
509.30 kJ/mol  
99+
4th Energy Level
7,197.00 kJ/mol  
11
5,093.00 kJ/mol  
27
5th Energy Level
7,197.00 kJ/mol  
26
5,090.00 kJ/mol  
99+
6th Energy Level
7,197.00 kJ/mol  
40
5,090.00 kJ/mol  
99+
7th Energy level
7,197.00 kJ/mol  
35
5,090.00 kJ/mol  
99+
8th Energy Level
3,480.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
9th Energy Level
5,090.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
10th Energy Level
7,197.00 kJ/mol  
33
5,090.00 kJ/mol  
99+
11th Energy Level
7,197.00 kJ/mol  
32
5,090.00 kJ/mol  
99+
12th Energy Level
7,190.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
13th Energy Level
7,190.00 kJ/mol  
27
5,090.00 kJ/mol  
99+
14th Energy Level
7,197.00 kJ/mol  
21
5,090.00 kJ/mol  
99+
15th Energy Level
71,900.00 kJ/mol  
23
50,900.00 kJ/mol  
99+
16th Energy Level
71,900.00 kJ/mol  
18
50,900.00 kJ/mol  
99+
17th Energy Level
719.70 kJ/mol  
39
509.30 kJ/mol  
99+
18th Energy Level
7,197.00 kJ/mol  
29
5,090.00 kJ/mol  
99+
19th Energy Level
719.70 kJ/mol  
36
509.30 kJ/mol  
99+
20th Energy Level
719.00 kJ/mol  
30
509.00 kJ/mol  
99+
21st Energy Level
719.70 kJ/mol  
99+
509.30 kJ/mol  
99+
22nd Energy Level
719.00 kJ/mol  
24
509.00 kJ/mol  
99+
23rd Energy Level
719.70 kJ/mol  
99+
509.30 kJ/mol  
99+
24th Energy Level
719.70 kJ/mol  
23
509.30 kJ/mol  
99+
25th Energy Level
719.00 kJ/mol  
23
509.00 kJ/mol  
99+
26th Energy Level
719.70 kJ/mol  
23
509.30 kJ/mol  
99+
27th Energy Level
719.70 kJ/mol  
22
509.30 kJ/mol  
99+
28th Energy Level
719.70 kJ/mol  
28
509.30 kJ/mol  
99+
29th Energy Level
719.70 kJ/mol  
29
509.30 kJ/mol  
99+
30th Energy Level
719.00 kJ/mol  
23
509.00 kJ/mol  
99+
Electrochemical Equivalent
1.28 g/amp-hr  
99+
4.22 g/amp-hr  
6
Electron Work Function
4.98 eV  
10
4.30 eV  
25
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
45  
99+
88  
30
Electron Configuration
[Kr] 4d8 5s1  
[Rn] 7s2  
Crystal Structure
Face Centered Cubic (FCC)  
Body Centered Cubic (BCC)  
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
45  
99+
88  
30
Number of Neutrons
58  
99+
138  
17
Number of Electrons
45  
99+
88  
30
Radius of an Atom
  
  
Atomic Radius
134.00 pm  
99+
215.00 pm  
6
Covalent Radius
142.00 pm  
99+
221.00 pm  
3
Van der Waals Radius
200.00 pm  
35
283.00 pm  
5
Atomic Weight
102.91 amu  
99+
226.00 amu  
26
Atomic Volume
8.30 cm3/mol  
99+
45.20 cm3/mol  
5
Adjacent Atomic Numbers
  
  
Previous Element
Ruthenium
  
Francium
  
Next Element
Palladium
  
Actinium
  
Valence Electron Potential
64.00 (-eV)  
22
20.10 (-eV)  
99+
Lattice Constant
380.34 pm  
30
514.80 pm  
15
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.73  
7
1.57  
99+
Mechanical
Density
  
  
Density At Room Temperature
12.41 g/cm3  
30
5.50 g/cm3  
99+
Density When Liquid (at m.p.)
10.70 g/cm3  
35
5.50 g/cm3  
99+
Tensile Strength
951.00 MPa  
5
40.00 MPa  
99+
Viscosity
0.00  
25
0.00  
2
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
16
Vapor Pressure at 2000 K
0.02 (Pa)  
19
0.00 (Pa)  
33
Elasticity properties
  
  
Shear Modulus
150.00 GPa  
6
25.00 GPa  
38
Bulk Modulus
275.00 GPa  
5
43.00 GPa  
33
Young's Modulus
380.00 GPa  
5
83.00 GPa  
25
Poisson Ratio
0.26  
22
0.31  
13
Other Mechanical Properties
Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
12.41  
32
5.00  
99+
Magnetic Ordering
Paramagnetic  
Nonmagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
9
Susceptibility
0.00  
24
0.00  
18
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
43.30 nΩ·m  
99+
100.00 nΩ·m  
31
Electrical Conductivity
0.21 106/cm Ω  
8
0.00 106/cm Ω  
99+
Electron Affinity
109.70 kJ/mol  
8
0.90 kJ/mol  
99+
Thermal
Specific Heat
0.24 J/(kg K)  
22
0.12 J/(kg K)  
99+
Molar Heat Capacity
24.98 J/mol·K  
99+
20.05 J/mol·K  
99+
Thermal Conductivity
150.00 W/m·K  
9
18.60 W/m·K  
99+
Critical Temperature
2,237.00 K  
13
973.00 K  
99+
Thermal Expansion
8.20 µm/(m·K)  
99+
8.50 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol  
16
113.00 kJ/mol  
99+
Enthalpy of Fusion
21.76 kJ/mol  
10
8.60 kJ/mol  
99+
Enthalpy of Atomization
556.50 kJ/mol  
16
163.00 kJ/mol  
99+
Standard Molar Entropy
31.50 J/mol.K  
99+
71.00 J/mol.K  
14
Periodic Table >>
<< All

Compare Transition Metals

Transition Metals

Transition Metals

» More Transition Metals

Compare Transition Metals

» More Compare Transition Metals
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!