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Thallium vs Rhodium

Thallium
Rhodium
Rhodium vs Thallium


Periodic Table
Symbol
Tl   
Rh   
Group Number
13   
5
9   
9
Period Number
6   
5   
Block
p block   
d block   
Element Family
Post-​Transition   
Transition Metal   
CAS Number
7440280   
99+
7440166   
99+
Space Group Name
P63/mmc   
Fm_ 3m   
Space Group Number
194.00   
5
225.00   
2
Facts
Interesting Facts
  • Compounds of Thallium metal are highly Toxic.
  • Thallium metal is being suspected as a human carcinogen.
  
  • 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
Found As a By-product, Ores of metals, Ores of Minerals   
Earth's crust, Found As a By-product, Found in Minerals, Mining   
History
  
  
Who Discovered
William Crookes   
William Hyde Wollaston   
Discovery
In 1861   
In 1804   
Abundance
  
  
Abundance In Universe
5 * 10-9 %   
32
6 * 10-8 %   
26
Abundance In Sun
~0.0000001 %   
26
~0.0000002 %   
25
Abundance In Meteorites
0.00 %   
99+
0.00 %   
36
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
99+
Abundance In Oceans
0.00 %   
34
Not Available   
Uses
Uses & Benefits
  • Thallium is a toxic metal and hence it has limited uses. Thallium metal is mostly used for producing photoelectric cells.
  • In thermometer’s mercury alloy has 8% of thallium, as it has a melting point lower than 20°C.
  
  • 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
Chemical Industry   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
Medical Research   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Highly Toxic   
NA   
Present in Human Body
Yes   
No   
In Blood
0.00 Blood/mg dm-3   
34
Not Available   
In Bone
0.00 p.p.m.   
33
Not Available   
Physical Properties
Melting Point
303.50 °C   
99+
1,966.00 °C   
12
Boiling Point
1,457.00 °C   
99+
3,727.00 °C   
17
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery White   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
1.20   
20
6.00   
6
Brinell Hardness
26.50 MPa   
99+
980.00 MPa   
9
Vickers Hardness
Not Available   
1,100.00 MPa   
9
Speed of Sound
818.00 m/s   
99+
4,700.00 m/s   
15
Optical Properties
  
  
Reflectivity
Not Available   
84.00 %   
4
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
Tl   
Rh   
Isotopes
  
  
Known Isotopes
32   
7
16   
23
Electronegativity
  
  
Pauling Electronegativity
1.62   
21
2.28   
3
Sanderson Electronegativity
2.25   
5
Not Available   
Allred Rochow Electronegativity
1.44   
17
1.45   
16
Mulliken-Jaffe Electronegativity
1.96   
6
Not Available   
Allen Electronegativity
1.79   
13
1.56   
24
Electropositivity
  
  
Pauling Electropositivity
2.38   
33
1.72   
99+
Ionization Energies
  
  
1st Energy Level
589.40 kJ/mol   
99+
719.70 kJ/mol   
29
2nd Energy Level
1,971.00 kJ/mol   
14
1,740.00 kJ/mol   
26
3rd Energy Level
2,878.00 kJ/mol   
32
2,997.00 kJ/mol   
27
Electrochemical Equivalent
7.63 g/amp-hr   
2
1.28 g/amp-hr   
99+
Electron Work Function
3.84 eV   
28
4.98 eV   
6
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
81   
35
45   
99+
Electron Configuration
[Xe] 4f14 5d10 6s2 6p1   
[Kr] 4d8 5s1   
Crystal Structure
Hexagonal Close Packed (HCP)   
Face Centered Cubic (FCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
FCC-Crystal-Structure-of-Rhodium.jpg#100   
Atom
  
  
Number of Protons
81   
35
45   
99+
Number of Neutrons
123   
20
58   
99+
Number of Electrons
81   
35
45   
99+
Radius of an Atom
  
  
Atomic Radius
170.00 pm   
22
134.00 pm   
99+
Covalent Radius
145.00 pm   
39
142.00 pm   
99+
Van der Waals Radius
196.00 pm   
30
200.00 pm   
28
Atomic Weight
204.38 amu   
31
102.91 amu   
99+
Atomic Volume
17.20 cm3/mol   
31
8.30 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Mercury
  
Ruthenium
  
Next Element
Lead
  
Palladium
  
Valence Electron Potential
9.60 (-eV)   
99+
64.00 (-eV)   
22
Lattice Constant
345.66 pm   
99+
380.34 pm   
27
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
1.60   
6
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
11.85 g/cm3   
31
12.41 g/cm3   
28
Density When Liquid (at m.p.)
11.22 g/cm3   
13
10.70 g/cm3   
14
Tensile Strength
Not Available   
951.00 MPa   
5
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
16.90 (Pa)   
5
Not Available   
Vapor Pressure at 2000 K
Not Available   
0.02 (Pa)   
19
Elasticity properties
  
  
Shear Modulus
2.80 GPa   
99+
150.00 GPa   
6
Bulk Modulus
43.00 GPa   
28
275.00 GPa   
5
Young's Modulus
8.00 GPa   
99+
380.00 GPa   
5
Poisson Ratio
0.45   
2
0.26   
22
Other Mechanical Properties
Ductile, Sectile   
Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
11.85   
22
12.41   
20
Magnetic Ordering
Diamagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
0.18 nΩ·m   
99+
43.30 nΩ·m   
99+
Electrical Conductivity
0.06 106/cm Ω   
32
0.21 106/cm Ω   
8
Electron Affinity
19.20 kJ/mol   
32
109.70 kJ/mol   
7
Thermal Properties
Specific Heat
0.13 J/(kg K)   
39
0.24 J/(kg K)   
22
Molar Heat Capacity
26.32 J/mol·K   
29
24.98 J/mol·K   
99+
Thermal Conductivity
46.10 W/m·K   
33
150.00 W/m·K   
9
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
29.90 µm/(m·K)   
12
8.20 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
162.10 kJ/mol   
99+
495.40 kJ/mol   
12
Enthalpy of Fusion
4.27 kJ/mol   
99+
21.76 kJ/mol   
10
Enthalpy of Atomization
179.90 kJ/mol   
99+
556.50 kJ/mol   
12
Standard Molar Entropy
64.20 J/mol.K   
19
31.50 J/mol.K   
99+
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