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Lanthanum vs Thallium

Lanthanum
Thallium
Thallium vs Lanthanum


Periodic Table
Symbol
La  
Tl  
Group Number
3  
15
13  
5
Period Number
6  
6  
Block
f block  
p block  
Element Family
Lanthanide  
Post-​Transition  
CAS Number
7439910  
99+
7440280  
99+
Space Group Name
P63/mmc  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
  
  • Compounds of Thallium metal are highly Toxic.
  • Thallium metal is being suspected as a human carcinogen.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found As a By-product, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
Carl Gustaf Mosander  
William Crookes  
Discovery
In 1838  
In 1861  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
33
Abundance In Sun
0.00 %  
25
0.00 %  
26
Abundance In Meteorites
0.00 %  
32
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
19
0.00 %  
99+
Abundance In Oceans
0.00 %  
29
0.00 %  
34
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • It has no commercial uses, but its alloys are in high demand. Lanthanum and Nickel alloy is used for the hydrogen gas storage.
  • The best-known use for mischmetal alloy of Lanthanum is; as a ‘flints’ for cigarette lighters.
  
  • 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.
  
Industrial Uses
Electrical Industry, Electronic Industry  
Chemical Industry  
Medical Uses
-  
Medical Research  
Other Uses
Alloys, Mirror Manufacturing  
Alloys  
Biological Properties
  
  
Toxicity
Low Toxic  
Highly Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.00 Blood/mg dm-3  
32
0.00 Blood/mg dm-3  
37
In Bone
0.08 p.p.m.  
29
0.00 p.p.m.  
38
Physical
Melting Point
920.00 °C  
99+
303.50 °C  
99+
Boiling Point
3,469.00 °C  
19
1,457.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
-  
-  
Hardness
  
  
Mohs Hardness
2.50  
15
1.20  
21
Brinell Hardness
350.00 MPa  
36
26.50 MPa  
99+
Vickers Hardness
360.00 MPa  
99+
120.00 MPa  
99+
Speed of Sound
2,475.00 m/s  
99+
818.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.80  
22
1.90  
18
Reflectivity
70.00 %  
13
8.00 %  
37
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
La  
Tl  
Isotopes
  
  
Known Isotopes
31  
8
32  
7
Electronegativity
  
  
Pauling Electronegativity
1.10  
99+
1.62  
22
Sanderson Electronegativity
1.10  
38
2.25  
6
Allred Rochow Electronegativity
1.08  
32
1.44  
18
Mulliken-Jaffe Electronegativity
1.10  
99+
1.96  
11
Allen Electronegativity
1.10  
99+
1.79  
16
Electropositivity
  
  
Pauling Electropositivity
2.90  
10
2.38  
33
Ionization Energies
  
  
1st Energy Level
538.10 kJ/mol  
99+
589.40 kJ/mol  
99+
2nd Energy Level
1,067.00 kJ/mol  
99+
1,971.00 kJ/mol  
14
3rd Energy Level
1,850.30 kJ/mol  
99+
2,878.00 kJ/mol  
32
4th Energy Level
4,819.00 kJ/mol  
32
5,890.00 kJ/mol  
17
5th Energy Level
5,940.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
6th Energy Level
5,380.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
7th Energy level
5,380.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
8th Energy Level
5,380.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
9th Energy Level
5,380.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
10th Energy Level
5,380.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
11th Energy Level
5,380.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
12th Energy Level
5,380.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
13th Energy Level
5,380.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
14th Energy Level
5,380.00 kJ/mol  
99+
5,890.00 kJ/mol  
37
15th Energy Level
53,800.00 kJ/mol  
99+
58,900.00 kJ/mol  
99+
16th Energy Level
53,800.00 kJ/mol  
99+
58,900.00 kJ/mol  
38
17th Energy Level
538.10 kJ/mol  
99+
589.40 kJ/mol  
99+
18th Energy Level
5,380.00 kJ/mol  
99+
5,890.00 kJ/mol  
99+
19th Energy Level
538.10 kJ/mol  
99+
589.40 kJ/mol  
99+
20th Energy Level
538.00 kJ/mol  
99+
589.00 kJ/mol  
99+
21st Energy Level
538.10 kJ/mol  
99+
589.40 kJ/mol  
99+
22nd Energy Level
538.00 kJ/mol  
99+
589.00 kJ/mol  
99+
23rd Energy Level
5,380.00 kJ/mol  
25
589.40 kJ/mol  
99+
24th Energy Level
538.00 kJ/mol  
99+
589.40 kJ/mol  
99+
25th Energy Level
538.00 kJ/mol  
99+
589.40 kJ/mol  
99+
26th Energy Level
538.00 kJ/mol  
99+
589.40 kJ/mol  
99+
27th Energy Level
538.10 kJ/mol  
99+
589.40 kJ/mol  
99+
28th Energy Level
538.00 kJ/mol  
99+
589.40 kJ/mol  
99+
29th Energy Level
538.10 kJ/mol  
99+
589.40 kJ/mol  
99+
30th Energy Level
538.00 kJ/mol  
99+
589.40 kJ/mol  
99+
Electrochemical Equivalent
1.73 g/amp-hr  
99+
7.63 g/amp-hr  
2
Electron Work Function
3.50 eV  
99+
3.84 eV  
39
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility  
Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
57  
99+
81  
35
Electron Configuration
[Xe] 5d2 6s2  
[Xe] 4f14 5d10 6s2 6p1  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
57  
99+
81  
35
Number of Neutrons
82  
99+
123  
21
Number of Electrons
57  
99+
81  
35
Radius of an Atom
  
  
Atomic Radius
187.00 pm  
10
170.00 pm  
24
Covalent Radius
207.00 pm  
6
145.00 pm  
99+
Van der Waals Radius
240.00 pm  
17
196.00 pm  
37
Atomic Weight
138.91 amu  
99+
204.38 amu  
31
Atomic Volume
20.73 cm3/mol  
26
17.20 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Barium
  
Mercury
  
Next Element
Cerium
  
Lead
  
Valence Electron Potential
40.71 (-eV)  
99+
9.60 (-eV)  
99+
Lattice Constant
377.20 pm  
31
345.66 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.62  
16
1.60  
23
Mechanical
Density
  
  
Density At Room Temperature
6.16 g/cm3  
99+
11.85 g/cm3  
33
Density When Liquid (at m.p.)
5.94 g/cm3  
99+
11.22 g/cm3  
33
Tensile Strength
45.00 MPa  
40
47.00 MPa  
39
Viscosity
0.00  
25
0.00  
22
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
16.90 (Pa)  
5
Vapor Pressure at 2000 K
0.98 (Pa)  
15
0.00 (Pa)  
38
Elasticity properties
  
  
Shear Modulus
14.30 GPa  
99+
2.80 GPa  
99+
Bulk Modulus
27.90 GPa  
99+
43.00 GPa  
33
Young's Modulus
36.60 GPa  
99+
8.00 GPa  
99+
Poisson Ratio
0.28  
17
0.45  
2
Other Mechanical Properties
Ductile  
Ductile, Sectile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
6.17  
99+
11.85  
35
Magnetic Ordering
Paramagnetic  
Diamagnetic  
Permeability
0.00 H/m  
15
0.00 H/m  
17
Susceptibility
0.00  
25
0.00  
28
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
615.00 nΩ·m  
7
0.18 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.06 106/cm Ω  
37
Electron Affinity
48.00 kJ/mol  
28
19.20 kJ/mol  
38
Thermal
Specific Heat
0.19 J/(kg K)  
33
0.13 J/(kg K)  
40
Molar Heat Capacity
27.11 J/mol·K  
27
26.32 J/mol·K  
37
Thermal Conductivity
13.40 W/m·K  
99+
46.10 W/m·K  
33
Critical Temperature
1,193.00 K  
99+
577.00 K  
99+
Thermal Expansion
12.10 µm/(m·K)  
99+
29.90 µm/(m·K)  
12
Enthalpy
  
  
Enthalpy of Vaporization
399.60 kJ/mol  
24
162.10 kJ/mol  
99+
Enthalpy of Fusion
6.20 kJ/mol  
99+
4.27 kJ/mol  
99+
Enthalpy of Atomization
431.00 kJ/mol  
21
179.90 kJ/mol  
99+
Standard Molar Entropy
56.90 J/mol.K  
31
64.20 J/mol.K  
20
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