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Thallium Gallium Comparison


Gallium Thallium comparison


Periodic Table

Symbol
Tl   
Ga   

Group Number
13   
5
13   
5

Period Number
6   
4   

Block
p block   
p block   

Element Family
Post-​Transition   
Post-​Transition   

CAS Number
7440280   
99+
7440553   
32

Space Group Name
P63/mmc   
Cmca   

Space Group Number
194.00   
5
64.00   
9

Facts

Interesting Facts
  • Compounds of Thallium metal are highly Toxic.
  • Thallium metal is being suspected as a human carcinogen.
  
  • A gram of Gallium metal can be bought for only three dollars.
  • Gallium metal found in ores of following things Coal, Bauxite, Diaspore, Sphalerite, Germanite and Zinc.
  

Sources
Found As a By-product, Ores of metals, Ores of Minerals   
Earth's crust, Found in Minerals, Mining, Ores of Minerals   

History
  
  

Who Discovered
William Crookes   
Lecoq de Boisbaudran   

Discovery
In 1861   
In 1875   

Abundance
  
  

Abundance In Universe
5 * 10-9 %   
32
1 * 10-6 %   
16

Abundance In Sun
~0.0000001 %   
26
~0.000004 %   
16

Abundance In Meteorites
0.00 %   
99+
0.00 %   
16

Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
24

Abundance In Oceans
0.00 %   
34
0.00 %   
22

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.
  
  • Gallium arsenide is a very important component of many semiconductors and led manufacturing.
  • Gallium nitride is also know as a semiconductor and it is used in Blu-ray technology, mobile smartphones and LED.
  

Industrial Uses
Chemical Industry   
Electrical Industry, Electronic Industry   

Medical Uses
Medical Research   
Surgical Instruments Manufacturing   

Other Uses
Alloys   
Alloys   

Biological Properties
  
  

Toxicity
Highly Toxic   
Non Toxic   

Present in Human Body
Yes   
Yes   

In Blood
0.00 Blood/mg dm-3   
34
0.08 Blood/mg dm-3   
13

In Bone
0.00 p.p.m.   
33
Not Available   

Physical Properties

Melting Point
303.50 °C   
99+
29.78 °C   
99+

Boiling Point
1,457.00 °C   
99+
2,403.00 °C   
99+

Appearance
  
  

Physical State
Solid   
Solid   

Color
Silvery White   
Silvery White   

Luster
NA   
Metallic   

Hardness
  
  

Mohs Hardness
1.20   
20
1.50   
18

Brinell Hardness
26.50 MPa   
99+
56.80 MPa   
99+

Speed of Sound
818.00 m/s   
99+
2,740.00 m/s   
31

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   
Ga   

Isotopes
  
  

Known Isotopes
32   
7
24   
15

Electronegativity
  
  

Pauling Electronegativity
1.62   
21
1.81   
15

Sanderson Electronegativity
2.25   
5
2.42   
2

Allred Rochow Electronegativity
1.44   
17
1.82   
1

Mulliken-Jaffe Electronegativity
1.96   
6
2.01   
5

Allen Electronegativity
1.79   
13
1.76   
14

Electropositivity
  
  

Pauling Electropositivity
2.38   
33
2.19   
39

Ionization Energies
  
  

1st Energy Level
589.40 kJ/mol   
99+
578.80 kJ/mol   
99+

2nd Energy Level
1,971.00 kJ/mol   
14
1,979.30 kJ/mol   
13

3rd Energy Level
2,878.00 kJ/mol   
32
2,963.00 kJ/mol   
28

4th Energy Level
Not Available   
6,180.00 kJ/mol   
8

Electrochemical Equivalent
7.63 g/amp-hr   
2
0.87 g/amp-hr   
99+

Electron Work Function
3.84 eV   
28
4.20 eV   
23

Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes   

Atomic Properties

Atomic Number
81   
35
31   
99+

Electron Configuration
[Xe] 4f14 5d10 6s2 6p1   
[Ar] 3d10 4s2 4p1   

Crystal Structure
Hexagonal Close Packed (HCP)   
Orthorhombic (ORTH)   

Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
ORTH-Crystal-Structure-of-Gallium.jpg#100   

Atom
  
  

Number of Protons
81   
35
31   
99+

Number of Neutrons
123   
20
39   
99+

Number of Electrons
81   
35
31   
99+

Radius of an Atom
  
  

Atomic Radius
170.00 pm   
22
135.00 pm   
99+

Covalent Radius
145.00 pm   
39
122.00 pm   
99+

Van der Waals Radius
196.00 pm   
30
187.00 pm   
32

Atomic Weight
204.38 amu   
31
69.72 amu   
99+

Atomic Volume
17.20 cm3/mol   
31
11.80 cm3/mol   
99+

Adjacent Atomic Numbers
  
  

Previous Element
Mercury
  
Zinc
  

Next Element
Lead
  
Rubidium
  

Valence Electron Potential
9.60 (-eV)   
99+
69.70 (-eV)   
19

Lattice Constant
345.66 pm   
99+
451.97 pm   
18

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
5.91 g/cm3   
99+

Density When Liquid (at m.p.)
11.22 g/cm3   
13
6.10 g/cm3   
99+

Tensile Strength
Not Available   
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Vapor Pressure at 1000 K
16.90 (Pa)   
5
0.00 (Pa)   
15

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+
9.80 GPa   
99+

Poisson Ratio
0.45   
2
0.47   
1

Other Mechanical Properties
Ductile, Sectile   
NA   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
11.85   
22
5.91   
99+

Magnetic Ordering
Diamagnetic   
Diamagnetic   

Electrical Properties
  
  

Electrical Property
Conductor   
Semiconductor   

Resistivity
0.18 nΩ·m   
99+
270.00 nΩ·m   
15

Electrical Conductivity
0.06 106/cm Ω   
32
0.07 106/cm Ω   
29

Electron Affinity
19.20 kJ/mol   
32
28.90 kJ/mol   
31

Thermal Properties

Specific Heat
0.13 J/(kg K)   
39
0.37 J/(kg K)   
16

Molar Heat Capacity
26.32 J/mol·K   
29
25.86 J/mol·K   
35

Thermal Conductivity
46.10 W/m·K   
33
40.60 W/m·K   
34

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
29.90 µm/(m·K)   
12
18.00 µm/(m·K)   
24

Enthalpy
  
  

Enthalpy of Vaporization
162.10 kJ/mol   
99+
256.10 kJ/mol   
36

Enthalpy of Fusion
4.27 kJ/mol   
99+
5.59 kJ/mol   
99+

Enthalpy of Atomization
179.90 kJ/mol   
99+
276.10 kJ/mol   
39

Standard Molar Entropy
64.20 J/mol.K   
19
40.80 J/mol.K   
38

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