Home
 Compare Metals

Rhodium vs Protactinium

Rhodium
Protactinium
Protactinium vs Rhodium


Periodic Table
Symbol
Rh  
Pa  
Group Number
9  
9
3  
15
Period Number
5  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440166  
99+
7440133  
99+
Space Group Name
Fm_ 3m  
I4/mmm  
Space Group Number
225.00  
3
139.00  
11
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.
  
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining  
Found in Uranium Ores, Mining, Ores of metals  
History
  
  
Who Discovered
William Hyde Wollaston  
William Crookes  
Discovery
In 1804  
In 1900  
Abundance
  
  
Abundance In Universe
0.00 %  
27
0.00 %  
17
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 %  
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.
  
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
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  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,966.00 °C  
12
1,568.00 °C  
21
Boiling Point
3,727.00 °C  
17
4,027.00 °C  
12
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
5.00  
8
Brinell Hardness
980.00 MPa  
10
125.00 MPa  
99+
Vickers Hardness
1,100.00 MPa  
15
220.00 MPa  
99+
Speed of Sound
4,700.00 m/s  
19
12,400.00 m/s  
3
Optical Properties
  
  
Refractive Index
2.40  
7
1.60  
33
Reflectivity
84.00 %  
5
60.00 %  
23
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rh  
Pa  
Isotopes
  
  
Known Isotopes
16  
23
27  
12
Electronegativity
  
  
Pauling Electronegativity
2.28  
4
1.50  
28
Sanderson Electronegativity
2.28  
5
1.50  
18
Allred Rochow Electronegativity
1.45  
17
1.14  
29
Mulliken-Jaffe Electronegativity
2.28  
4
1.50  
26
Allen Electronegativity
1.56  
27
1.50  
32
Electropositivity
  
  
Pauling Electropositivity
1.72  
99+
2.50  
27
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol  
29
568.00 kJ/mol  
99+
2nd Energy Level
1,740.00 kJ/mol  
27
1,128.00 kJ/mol  
99+
3rd Energy Level
2,997.00 kJ/mol  
27
1,814.00 kJ/mol  
99+
4th Energy Level
7,197.00 kJ/mol  
11
2,991.00 kJ/mol  
99+
5th Energy Level
7,197.00 kJ/mol  
26
5,120.00 kJ/mol  
99+
6th Energy Level
7,197.00 kJ/mol  
40
5,680.00 kJ/mol  
99+
7th Energy level
7,197.00 kJ/mol  
35
5,680.00 kJ/mol  
99+
8th Energy Level
3,480.00 kJ/mol  
99+
5,680.00 kJ/mol  
99+
9th Energy Level
5,090.00 kJ/mol  
99+
5,120.00 kJ/mol  
99+
10th Energy Level
7,197.00 kJ/mol  
33
5,120.00 kJ/mol  
99+
11th Energy Level
7,197.00 kJ/mol  
32
5,680.00 kJ/mol  
99+
12th Energy Level
7,190.00 kJ/mol  
99+
5,680.00 kJ/mol  
99+
13th Energy Level
7,190.00 kJ/mol  
27
5,680.00 kJ/mol  
99+
14th Energy Level
7,197.00 kJ/mol  
21
5,680.00 kJ/mol  
99+
15th Energy Level
71,900.00 kJ/mol  
23
56,800.00 kJ/mol  
99+
16th Energy Level
71,900.00 kJ/mol  
18
56,800.00 kJ/mol  
99+
17th Energy Level
719.70 kJ/mol  
39
568.50 kJ/mol  
99+
18th Energy Level
7,197.00 kJ/mol  
29
5,680.00 kJ/mol  
99+
19th Energy Level
719.70 kJ/mol  
36
568.30 kJ/mol  
99+
20th Energy Level
719.00 kJ/mol  
30
568.00 kJ/mol  
99+
21st Energy Level
719.70 kJ/mol  
99+
568.00 kJ/mol  
99+
22nd Energy Level
719.00 kJ/mol  
24
568.00 kJ/mol  
99+
23rd Energy Level
719.70 kJ/mol  
99+
568.00 kJ/mol  
99+
24th Energy Level
719.70 kJ/mol  
23
568.00 kJ/mol  
99+
25th Energy Level
719.00 kJ/mol  
23
568.00 kJ/mol  
99+
26th Energy Level
719.70 kJ/mol  
23
568.00 kJ/mol  
99+
27th Energy Level
719.70 kJ/mol  
22
568.00 kJ/mol  
99+
28th Energy Level
719.70 kJ/mol  
28
568.00 kJ/mol  
99+
29th Energy Level
719.70 kJ/mol  
29
568.00 kJ/mol  
99+
30th Energy Level
719.00 kJ/mol  
23
568.00 kJ/mol  
99+
Electrochemical Equivalent
1.28 g/amp-hr  
99+
1.72 g/amp-hr  
99+
Electron Work Function
4.98 eV  
10
5.89 eV  
3
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
45  
99+
91  
27
Electron Configuration
[Kr] 4d8 5s1  
[Rn] 5f2 6d1 7s2  
Crystal Structure
Face Centered Cubic (FCC)  
Tetragonal (TETR)  
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100  
TETR-Crystal-Structure-of-Protactinium.jpg#100  
Atom
  
  
Number of Protons
45  
99+
91  
27
Number of Neutrons
58  
99+
122  
22
Number of Electrons
45  
99+
91  
27
Radius of an Atom
  
  
Atomic Radius
134.00 pm  
99+
163.00 pm  
27
Covalent Radius
142.00 pm  
99+
200.00 pm  
11
Van der Waals Radius
200.00 pm  
35
243.00 pm  
15
Atomic Weight
102.91 amu  
99+
231.04 amu  
24
Atomic Volume
8.30 cm3/mol  
99+
15.00 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Ruthenium
  
Thorium
  
Next Element
Palladium
  
Uranium
  
Valence Electron Potential
64.00 (-eV)  
22
92.00 (-eV)  
11
Lattice Constant
380.34 pm  
30
392.50 pm  
26
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.73  
7
1.58  
36
Mechanical
Density
  
  
Density At Room Temperature
12.41 g/cm3  
30
15.37 g/cm3  
20
Density When Liquid (at m.p.)
10.70 g/cm3  
35
15.37 g/cm3  
21
Tensile Strength
951.00 MPa  
5
80.00 MPa  
29
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.02 (Pa)  
19
0.00 (Pa)  
32
Elasticity properties
  
  
Shear Modulus
150.00 GPa  
6
16.00 GPa  
99+
Bulk Modulus
275.00 GPa  
5
47.00 GPa  
26
Young's Modulus
380.00 GPa  
5
47.00 GPa  
99+
Poisson Ratio
0.26  
22
0.23  
30
Other Mechanical Properties
Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
12.41  
32
15.37  
23
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
10
Susceptibility
0.00  
24
0.00  
21
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
43.30 nΩ·m  
99+
177.00 nΩ·m  
21
Electrical Conductivity
0.21 106/cm Ω  
8
0.05 106/cm Ω  
39
Electron Affinity
109.70 kJ/mol  
8
53.03 kJ/mol  
22
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
47.00 W/m·K  
32
Critical Temperature
2,237.00 K  
13
1,841.00 K  
25
Thermal Expansion
8.20 µm/(m·K)  
99+
9.90 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol  
16
481.00 kJ/mol  
17
Enthalpy of Fusion
21.76 kJ/mol  
10
12.34 kJ/mol  
34
Enthalpy of Atomization
556.50 kJ/mol  
16
481.90 kJ/mol  
19
Standard Molar Entropy
31.50 J/mol.K  
99+
198.10 J/mol.K  
1
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!