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Rhodium Actinium Comparison

Rhodium
Actinium
Actinium Rhodium comparison


Periodic Table
Symbol
Rh  
Ac  
Group Number
9  
9
3  
15
Period Number
5  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440166  
99+
7440348  
99+
Space Group Name
Fm_ 3m  
Fm_ 3m  
Space Group Number
225.00  
3
225.00  
3
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.
  
Actinium glows in the dark due to its radioactivity.  
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining  
Obtained by Treating Radium with Neutrons, Ores of metals  
History
  
  
Who Discovered
William Hyde Wollaston  
Friedrich Oskar Giesel  
Discovery
In 1804  
In 1902  
Abundance
  
  
Abundance In Universe
0.00 %  
27
0.00 %  
34
Abundance In Sun
0.00 %  
25
0.00 %  
26
Abundance In Meteorites
0.00 %  
36
0.00 %  
99+
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 %  
24
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.
  
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
-  
Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
37
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,966.00 °C  
12
1,227.00 °C  
38
Boiling Point
3,727.00 °C  
17
3,200.00 °C  
27
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
-  
Hardness
  
  
Mohs Hardness
6.00  
6
6.50  
5
Brinell Hardness
980.00 MPa  
10
70.00 MPa  
99+
Vickers Hardness
1,100.00 MPa  
15
260.00 MPa  
99+
Speed of Sound
4,700.00 m/s  
19
3,430.00 m/s  
32
Optical Properties
  
  
Refractive Index
2.40  
7
1.00  
99+
Reflectivity
84.00 %  
5
62.00 %  
21
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rh  
Ac  
Isotopes
  
  
Known Isotopes
16  
23
29  
10
Electronegativity
  
  
Pauling Electronegativity
2.28  
4
1.10  
99+
Sanderson Electronegativity
2.28  
5
1.10  
38
Allred Rochow Electronegativity
1.45  
17
1.00  
37
Mulliken-Jaffe Electronegativity
2.28  
4
1.10  
99+
Allen Electronegativity
1.56  
27
1.10  
99+
Electropositivity
  
  
Pauling Electropositivity
1.72  
99+
2.90  
10
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol  
29
499.00 kJ/mol  
99+
2nd Energy Level
1,740.00 kJ/mol  
27
1,170.00 kJ/mol  
99+
3rd Energy Level
2,997.00 kJ/mol  
27
1,900.00 kJ/mol  
99+
4th Energy Level
7,197.00 kJ/mol  
11
4,700.00 kJ/mol  
33
5th Energy Level
7,197.00 kJ/mol  
26
4,990.00 kJ/mol  
99+
6th Energy Level
7,197.00 kJ/mol  
40
5,750.00 kJ/mol  
99+
7th Energy level
7,197.00 kJ/mol  
35
5,750.00 kJ/mol  
99+
8th Energy Level
3,480.00 kJ/mol  
99+
5,750.00 kJ/mol  
99+
9th Energy Level
5,090.00 kJ/mol  
99+
4,990.00 kJ/mol  
99+
10th Energy Level
7,197.00 kJ/mol  
33
4,990.00 kJ/mol  
99+
11th Energy Level
7,197.00 kJ/mol  
32
4,990.00 kJ/mol  
99+
12th Energy Level
7,190.00 kJ/mol  
99+
49,900.00 kJ/mol  
21
13th Energy Level
7,190.00 kJ/mol  
27
4,990.00 kJ/mol  
99+
14th Energy Level
7,197.00 kJ/mol  
21
4,990.00 kJ/mol  
99+
15th Energy Level
71,900.00 kJ/mol  
23
49,900.00 kJ/mol  
99+
16th Energy Level
71,900.00 kJ/mol  
18
49,900.00 kJ/mol  
99+
17th Energy Level
719.70 kJ/mol  
39
499.00 kJ/mol  
99+
18th Energy Level
7,197.00 kJ/mol  
29
4,990.00 kJ/mol  
99+
19th Energy Level
719.70 kJ/mol  
36
499.00 kJ/mol  
99+
20th Energy Level
719.00 kJ/mol  
30
499.00 kJ/mol  
99+
21st Energy Level
719.70 kJ/mol  
99+
4,990.00 kJ/mol  
25
22nd Energy Level
719.00 kJ/mol  
24
499.00 kJ/mol  
99+
23rd Energy Level
719.70 kJ/mol  
99+
4,990.00 kJ/mol  
29
24th Energy Level
719.70 kJ/mol  
23
499.00 kJ/mol  
99+
25th Energy Level
719.00 kJ/mol  
23
499.00 kJ/mol  
99+
26th Energy Level
719.70 kJ/mol  
23
499.00 kJ/mol  
99+
27th Energy Level
719.70 kJ/mol  
22
499.00 kJ/mol  
99+
28th Energy Level
719.70 kJ/mol  
28
499.00 kJ/mol  
99+
29th Energy Level
719.70 kJ/mol  
29
499.00 kJ/mol  
99+
30th Energy Level
719.00 kJ/mol  
23
499.00 kJ/mol  
99+
Electrochemical Equivalent
1.28 g/amp-hr  
99+
2.82 g/amp-hr  
22
Electron Work Function
4.98 eV  
10
4.38 eV  
23
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
45  
99+
89  
29
Electron Configuration
[Kr] 4d8 5s1  
[Rn] 6d1 7s2  
Crystal Structure
Face Centered Cubic (FCC)  
Face Centered Cubic (FCC)  
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100  
FCC-Crystal-Structure-of-Actinium.jpg#100  
Atom
  
  
Number of Protons
45  
99+
89  
29
Number of Neutrons
58  
99+
138  
17
Number of Electrons
45  
99+
89  
29
Radius of an Atom
  
  
Atomic Radius
134.00 pm  
99+
195.00 pm  
9
Covalent Radius
142.00 pm  
99+
186.00 pm  
21
Van der Waals Radius
200.00 pm  
35
215.00 pm  
31
Atomic Weight
102.91 amu  
99+
227.00 amu  
25
Atomic Volume
8.30 cm3/mol  
99+
22.54 cm3/mol  
20
Adjacent Atomic Numbers
  
  
Previous Element
Ruthenium
  
Radium
  
Next Element
Palladium
  
Thorium
  
Valence Electron Potential
64.00 (-eV)  
22
38.60 (-eV)  
99+
Lattice Constant
380.34 pm  
30
567.00 pm  
9
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.73  
7
1.89  
2
Mechanical
Density
  
  
Density At Room Temperature
12.41 g/cm3  
30
10.00 g/cm3  
40
Density When Liquid (at m.p.)
10.70 g/cm3  
35
10.07 g/cm3  
40
Tensile Strength
951.00 MPa  
5
65.00 MPa  
33
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.02 (Pa)  
19
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
150.00 GPa  
6
25.00 GPa  
38
Bulk Modulus
275.00 GPa  
5
94.00 GPa  
17
Young's Modulus
380.00 GPa  
5
130.00 GPa  
16
Poisson Ratio
0.26  
22
0.34  
10
Other Mechanical Properties
Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
12.41  
32
10.07  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
43.30 nΩ·m  
99+
5.20 nΩ·m  
99+
Electrical Conductivity
0.21 106/cm Ω  
8
0.15 106/cm Ω  
13
Electron Affinity
109.70 kJ/mol  
8
33.20 kJ/mol  
34
Thermal
Specific Heat
0.24 J/(kg K)  
22
0.12 J/(kg K)  
99+
Molar Heat Capacity
24.98 J/mol·K  
99+
27.20 J/mol·K  
24
Thermal Conductivity
150.00 W/m·K  
9
12.00 W/m·K  
99+
Critical Temperature
2,237.00 K  
13
1,323.00 K  
99+
Thermal Expansion
8.20 µm/(m·K)  
99+
12.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol  
16
120.00 kJ/mol  
99+
Enthalpy of Fusion
21.76 kJ/mol  
10
14.20 kJ/mol  
28
Enthalpy of Atomization
556.50 kJ/mol  
16
301.00 kJ/mol  
99+
Standard Molar Entropy
31.50 J/mol.K  
99+
56.50 J/mol.K  
33
Summary >>
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