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Thallium vs Cerium

Thallium
Cerium
Cerium vs Thallium


Periodic Table
Symbol
Tl  
Ce  
Group Number
13  
5
Not Available  
Period Number
6  
6  
Block
p block  
f block  
Element Family
Post-​Transition  
Lanthanide  
CAS Number
7440280  
99+
7440451  
99+
Space Group Name
P63/mmc  
P63/mmc  
Space Group Number
194.00  
5
194.00  
5
Facts
Interesting Facts
  • Compounds of Thallium metal are highly Toxic.
  • Thallium metal is being suspected as a human carcinogen.
  
  • Cerium is a rare earth metal but still it is not rare at all.
  • It’s non-toxic compound Cerium sulfide has a rich red color and it is used as a pigment.
  • Cerium metal is also used in Flat screen TVs, light bulb, floodlights, etc.
  
Sources
Found As a By-product, Ores of metals, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
William Crookes  
Martin Heinrich Klaproth, Jöns Jakob Berzelius, Wilhelm Hisinger  
Discovery
In 1861  
In 1803  
Abundance
  
  
Abundance In Universe
5 * 10-9 %  
32
1 * 10-6 %  
16
Abundance In Sun
~0.0000001 %  
26
~0.0000004 %  
23
Abundance In Meteorites
0.00 %  
99+
0.00 %  
27
Abundance In Earth's Crust
0.00 %  
99+
0.01 %  
18
Abundance In Oceans
0.00 %  
34
0.00 %  
33
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 include flints for cigarette lighters.
  • Its compound Cerium (Ill) Oxide is used as a catalyst; it is put inside the walls of the oven as it prevents from the buildup of cooking residues.
  
Industrial Uses
Chemical Industry  
Chemical Industry  
Medical Uses
Medical Research  
Medical Research  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Highly Toxic  
Moderately Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.00 Blood/mg dm-3  
34
0.00 Blood/mg dm-3  
30
In Bone
0.00 p.p.m.  
33
2.70 p.p.m.  
14
Physical Properties
Melting Point
303.50 °C  
99+
795.00 °C  
99+
Boiling Point
1,457.00 °C  
99+
3,257.00 °C  
23
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
NA  
Lustrous  
Hardness
  
  
Mohs Hardness
1.20  
20
2.50  
14
Brinell Hardness
26.50 MPa  
99+
186.00 MPa  
99+
Vickers Hardness
Not Available  
210.00 MPa  
32
Speed of Sound
818.00 m/s  
99+
2,100.00 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  
Ce  
Isotopes
  
  
Known Isotopes
32  
7
30  
9
Electronegativity
  
  
Pauling Electronegativity
1.62  
21
1.12  
99+
Sanderson Electronegativity
2.25  
5
Not Available  
Allred Rochow Electronegativity
1.44  
17
1.08  
31
Mulliken-Jaffe Electronegativity
1.96  
6
Not Available  
Allen Electronegativity
1.79  
13
Not Available  
Electropositivity
  
  
Pauling Electropositivity
2.38  
33
2.88  
11
Ionization Energies
  
  
1st Energy Level
589.40 kJ/mol  
99+
534.40 kJ/mol  
99+
2nd Energy Level
1,971.00 kJ/mol  
14
1,050.00 kJ/mol  
99+
3rd Energy Level
2,878.00 kJ/mol  
32
1,949.00 kJ/mol  
99+
4th Energy Level
Not Available  
3,547.00 kJ/mol  
99+
5th Energy Level
Not Available  
6,325.00 kJ/mol  
22
6th Energy Level
Not Available  
7,490.00 kJ/mol  
21
Electrochemical Equivalent
7.63 g/amp-hr  
2
1.74 g/amp-hr  
99+
Electron Work Function
3.84 eV  
28
2.84 eV  
39
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Solubility  
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic Properties
Atomic Number
81  
35
58  
99+
Electron Configuration
[Xe] 4f14 5d10 6s2 6p1  
[Xe] 4f1 5d1 6s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
DHCP-Crystal-Structure-of-Cerium.jpg#100  
Atom
  
  
Number of Protons
81  
35
58  
99+
Number of Neutrons
123  
20
82  
99+
Number of Electrons
81  
35
58  
99+
Radius of an Atom
  
  
Atomic Radius
170.00 pm  
22
181.80 pm  
12
Covalent Radius
145.00 pm  
39
204.00 pm  
8
Van der Waals Radius
196.00 pm  
30
235.00 pm  
17
Atomic Weight
204.38 amu  
31
140.12 amu  
99+
Atomic Volume
17.20 cm3/mol  
31
20.67 cm3/mol  
17
Adjacent Atomic Numbers
  
  
Previous Element
Mercury
  
Lanthanum
  
Next Element
Lead
  
Praseodymium
  
Valence Electron Potential
9.60 (-eV)  
99+
41.78 (-eV)  
99+
Lattice Constant
345.66 pm  
99+
362.00 pm  
34
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.60  
6
Not Available  
Mechanical Properties
Density
  
  
Density At Room Temperature
11.85 g/cm3  
31
6.77 g/cm3  
99+
Density When Liquid (at m.p.)
11.22 g/cm3  
13
6.55 g/cm3  
38
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)  
34
Vapor Pressure at 2000 K
Not Available  
1.04 (Pa)  
13
Elasticity properties
  
  
Shear Modulus
2.80 GPa  
99+
13.50 GPa  
99+
Bulk Modulus
43.00 GPa  
28
21.50 GPa  
99+
Young's Modulus
8.00 GPa  
99+
33.60 GPa  
99+
Poisson Ratio
0.45  
2
0.24  
27
Other Mechanical Properties
Ductile, Sectile  
Ductile, Malleable  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
11.85  
22
6.77  
99+
Magnetic Ordering
Diamagnetic  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
0.18 nΩ·m  
99+
828.00 nΩ·m  
3
Electrical Conductivity
0.06 106/cm Ω  
32
0.01 106/cm Ω  
99+
Electron Affinity
19.20 kJ/mol  
32
50.00 kJ/mol  
21
Thermal Properties
Specific Heat
0.13 J/(kg K)  
39
0.19 J/(kg K)  
32
Molar Heat Capacity
26.32 J/mol·K  
29
26.94 J/mol·K  
23
Thermal Conductivity
46.10 W/m·K  
33
11.30 W/m·K  
99+
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
29.90 µm/(m·K)  
12
6.30 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
162.10 kJ/mol  
99+
414.00 kJ/mol  
16
Enthalpy of Fusion
4.27 kJ/mol  
99+
5.46 kJ/mol  
99+
Enthalpy of Atomization
179.90 kJ/mol  
99+
381.00 kJ/mol  
23
Standard Molar Entropy
64.20 J/mol.K  
19
72.00 J/mol.K  
12
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