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Thallium vs Indium

Thallium
Indium
Indium vs Thallium


Periodic Table
Symbol
Tl   
In   
Group Number
13   
5
13   
5
Period Number
6   
5   
Block
p block   
p block   
Element Family
Post-​Transition   
Post-​Transition   
CAS Number
7440280   
99+
7440746   
17
Space Group Name
P63/mmc   
I4/mmm   
Space Group Number
194.00   
5
139.00   
8
Facts
Interesting Facts
  • Compounds of Thallium metal are highly Toxic.
  • Thallium metal is being suspected as a human carcinogen.
  
  • Luster of Indium is bright in nature.
  • Reich and richer were looking for thallium in zinc metal and they discovered Indium metal.
  
Sources
Found As a By-product, Ores of metals, Ores of Minerals   
Mining, Ores of metals   
History
  
  
Who Discovered
William Crookes   
Ferdinand Reich and Hieronymous Theodor Richter   
Discovery
In 1861   
In 1863   
Abundance
  
  
Abundance In Universe
5 * 10-9 %   
32
3 * 10-8 %   
28
Abundance In Sun
~0.0000001 %   
26
~0.0000004 %   
23
Abundance In Meteorites
0.00 %   
99+
0.00 %   
99+
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
99+
Abundance In Oceans
0.00 %   
34
0.00 %   
99+
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.
  
  • It is used to produce indium tin oxide (ITO), it is used in manufacturing touch screens, flat screen TVs and solar panels.
  • Its nitride, phosphide and antimonide are used in transistors and microchips.
  
Industrial Uses
Chemical Industry   
Aerospace Industry, Automobile Industry   
Medical Uses
Medical Research   
Medical Research   
Other Uses
Alloys   
Alloys, In Nuclear Reactors   
Biological Properties
  
  
Toxicity
Highly Toxic   
Non Toxic   
Present in Human Body
Yes   
Yes   
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+
156.61 °C   
99+
Boiling Point
1,457.00 °C   
99+
2,000.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery Gray   
Luster
NA   
Lustrous   
Hardness
  
  
Mohs Hardness
1.20   
20
1.20   
20
Brinell Hardness
26.50 MPa   
99+
8.80 MPa   
99+
Speed of Sound
818.00 m/s   
99+
1,215.00 m/s   
99+
Optical Properties
  
  
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   
In   
Isotopes
  
  
Known Isotopes
32   
7
35   
4
Electronegativity
  
  
Pauling Electronegativity
1.62   
21
1.78   
16
Sanderson Electronegativity
2.25   
5
2.14   
8
Allred Rochow Electronegativity
1.44   
17
1.49   
13
Mulliken-Jaffe Electronegativity
1.96   
6
1.76   
10
Allen Electronegativity
1.79   
13
1.66   
18
Electropositivity
  
  
Pauling Electropositivity
2.38   
33
2.22   
38
Ionization Energies
  
  
1st Energy Level
589.40 kJ/mol   
99+
558.30 kJ/mol   
99+
2nd Energy Level
1,971.00 kJ/mol   
14
1,820.70 kJ/mol   
18
3rd Energy Level
2,878.00 kJ/mol   
32
2,704.00 kJ/mol   
39
4th Energy Level
Not Available   
5,210.00 kJ/mol   
17
Electrochemical Equivalent
7.63 g/amp-hr   
2
1.43 g/amp-hr   
99+
Electron Work Function
3.84 eV   
28
4.12 eV   
24
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
81   
35
49   
99+
Electron Configuration
[Xe] 4f14 5d10 6s2 6p1   
[Kr] 4d10 5s2 5p1   
Crystal Structure
Hexagonal Close Packed (HCP)   
Tetragonal (TETR)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
TETR-Crystal-Structure-of-Indium.jpg#100   
Atom
  
  
Number of Protons
81   
35
49   
99+
Number of Neutrons
123   
20
66   
99+
Number of Electrons
81   
35
49   
99+
Radius of an Atom
  
  
Atomic Radius
170.00 pm   
22
167.00 pm   
24
Covalent Radius
145.00 pm   
39
142.00 pm   
99+
Van der Waals Radius
196.00 pm   
30
193.00 pm   
31
Atomic Weight
204.38 amu   
31
114.82 amu   
99+
Atomic Volume
17.20 cm3/mol   
31
15.70 cm3/mol   
33
Adjacent Atomic Numbers
  
  
Previous Element
Mercury
  
Cadmium
  
Next Element
Lead
  
Tin
  
Valence Electron Potential
9.60 (-eV)   
99+
54.00 (-eV)   
25
Lattice Constant
345.66 pm   
99+
325.23 pm   
99+
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
7.31 g/cm3   
99+
Density When Liquid (at m.p.)
11.22 g/cm3   
13
7.02 g/cm3   
33
Tensile Strength
Not Available   
2.50 MPa   
21
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
16.90 (Pa)   
5
0.01 (Pa)   
11
Elasticity properties
  
  
Shear Modulus
2.80 GPa   
99+
Not Available   
Bulk Modulus
43.00 GPa   
28
Not Available   
Young's Modulus
8.00 GPa   
99+
11.00 GPa   
99+
Poisson Ratio
0.45   
2
Not Available   
Other Mechanical Properties
Ductile, Sectile   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
11.85   
22
7.31   
99+
Magnetic Ordering
Diamagnetic   
Diamagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
0.18 nΩ·m   
99+
83.70 nΩ·m   
34
Electrical Conductivity
0.06 106/cm Ω   
32
0.12 106/cm Ω   
17
Electron Affinity
19.20 kJ/mol   
32
28.90 kJ/mol   
31
Thermal Properties
Specific Heat
0.13 J/(kg K)   
39
0.23 J/(kg K)   
27
Molar Heat Capacity
26.32 J/mol·K   
29
26.74 J/mol·K   
25
Thermal Conductivity
46.10 W/m·K   
33
81.80 W/m·K   
21
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
29.90 µm/(m·K)   
12
32.10 µm/(m·K)   
9
Enthalpy
  
  
Enthalpy of Vaporization
162.10 kJ/mol   
99+
226.40 kJ/mol   
40
Enthalpy of Fusion
4.27 kJ/mol   
99+
3.28 kJ/mol   
99+
Enthalpy of Atomization
179.90 kJ/mol   
99+
242.70 kJ/mol   
99+
Standard Molar Entropy
64.20 J/mol.K   
19
57.80 J/mol.K   
22
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