Rhodium Uranium Comparison
Periodic Table
Symbol
Rh
U
Group Number
9
9
0
18
Period Number
5
7
Block
d block
f block
Element Family
Transition Metal
Actinide
CAS Number
7440166
99+
7440611
28
Space Group Name
Fm_ 3m
Cmcm
Space Group Number
225.00
2
63.00
10
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.
- Major mining countries of Uranium include Russia, Australia, Namibia, Canada and Niger and total 33% Uranium are mine in Kazakhstan.
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining
Earth's crust, Mining, Ores of Minerals
History
Who Discovered
William Hyde Wollaston
Not Available
Discovery
In 1804
In 1789
Abundance
Abundance In Universe
6 * 10-8 %
26
2 * 10-8 %
29
Abundance In Sun
~0.0000002 %
25
~0.0000001 %
26
Abundance In Meteorites
0.00 %
36
0.00 %
99+
Abundance In Earth's Crust
0.00 %
99+
0.00 %
36
Abundance In Oceans
Not Available
0.00 %
11
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.
- The main use of this metal include nuclear fuel which is used to generate electricity yin nuclear power stations.
- Synthetic elements like transuranium are made from Uranium metal.
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
Ammunition Industry, Chemical Industry
Medical Uses
NA
NA
Other Uses
Alloys
Alloys, Jewellery, Nuclear Reactor's Fuel, Sculptures, Statues
Biological Properties
Toxicity
NA
Toxic
Present in Human Body
No
No
Physical Properties
Melting Point
1,966.00 °C
12
1,132.00 °C
39
Boiling Point
3,727.00 °C
17
3,818.00 °C
16
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery Gray
Luster
Metallic
Metallic
Hardness
Mohs Hardness
6.00
6
6.00
6
Brinell Hardness
980.00 MPa
9
2,350.00 MPa
2
Vickers Hardness
1,100.00 MPa
9
1,960.00 MPa
2
Speed of Sound
4,700.00 m/s
15
3,155.00 m/s
25
Optical Properties
Reflectivity
84.00 %
4
Not Available
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Rh
U
Isotopes
Known Isotopes
16
23
25
14
Electronegativity
Pauling Electronegativity
2.28
3
1.38
28
Allred Rochow Electronegativity
1.45
16
1.22
26
Allen Electronegativity
1.56
24
Not Available
Electropositivity
Pauling Electropositivity
1.72
99+
2.62
26
Ionization Energies
1st Energy Level
719.70 kJ/mol
29
597.60 kJ/mol
99+
2nd Energy Level
1,740.00 kJ/mol
26
1,420.00 kJ/mol
99+
3rd Energy Level
2,997.00 kJ/mol
27
1,900.00 kJ/mol
99+
4th Energy Level
Not Available
3,145.00 kJ/mol
99+
Electrochemical Equivalent
1.28 g/amp-hr
99+
1.48 g/amp-hr
99+
Electron Work Function
4.98 eV
6
3.63 eV
30
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
45
99+
92
26
Electron Configuration
[Kr] 4d8 5s1
[Rn] 5f3 6d1 7s2
Crystal Structure
Face Centered Cubic (FCC)
Orthorhombic (ORTH)
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100
ORTH-Crystal-Structure-of-Uranium.jpg#100
Atom
Number of Protons
45
99+
92
26
Number of Neutrons
58
99+
146
13
Number of Electrons
45
99+
92
26
Radius of an Atom
Atomic Radius
134.00 pm
99+
156.00 pm
29
Covalent Radius
142.00 pm
99+
196.00 pm
14
Van der Waals Radius
200.00 pm
28
186.00 pm
33
Atomic Weight
102.91 amu
99+
238.03 amu
21
Atomic Volume
8.30 cm3/mol
99+
12.59 cm3/mol
40
Adjacent Atomic Numbers
Valence Electron Potential
64.00 (-eV)
22
170.00 (-eV)
4
Lattice Constant
380.34 pm
27
295.08 pm
99+
Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
12.41 g/cm3
28
19.10 g/cm3
17
Density When Liquid (at m.p.)
10.70 g/cm3
14
17.30 g/cm3
7
Tensile Strength
951.00 MPa
5
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
0.02 (Pa)
19
0.01 (Pa)
20
Elasticity properties
Shear Modulus
150.00 GPa
6
111.00 GPa
10
Bulk Modulus
275.00 GPa
5
100.00 GPa
16
Young's Modulus
380.00 GPa
5
208.00 GPa
10
Poisson Ratio
0.26
22
0.23
30
Other Mechanical Properties
Malleable
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
12.41
20
18.80
10
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Poor Conductor
Resistivity
43.30 nΩ·m
99+
0.28 nΩ·m
99+
Electrical Conductivity
0.21 106/cm Ω
8
0.04 106/cm Ω
37
Electron Affinity
109.70 kJ/mol
7
Not Available
Thermal Properties
Specific Heat
0.24 J/(kg K)
22
0.12 J/(kg K)
40
Molar Heat Capacity
24.98 J/mol·K
99+
27.67 J/mol·K
15
Thermal Conductivity
150.00 W/m·K
9
27.50 W/m·K
40
Critical Temperature
Not Available
Not Available
Thermal Expansion
8.20 µm/(m·K)
99+
13.90 µm/(m·K)
27
Enthalpy
Enthalpy of Vaporization
495.40 kJ/mol
12
477.00 kJ/mol
13
Enthalpy of Fusion
21.76 kJ/mol
10
15.48 kJ/mol
19
Enthalpy of Atomization
556.50 kJ/mol
12
489.50 kJ/mol
14
Standard Molar Entropy
31.50 J/mol.K
99+
50.20 J/mol.K
31
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