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Cerium vs Thallium

Cerium
Thallium
Thallium vs Cerium


Periodic Table
Symbol
Ce   
Tl   
Group Number
Not Available   
13   
5
Period Number
6   
6   
Block
f block   
p block   
Element Family
Lanthanide   
Post-​Transition   
CAS Number
7440451   
99+
7440280   
99+
Space Group Name
P63/mmc   
P63/mmc   
Space Group Number
194.00   
5
194.00   
5
Facts
Interesting Facts
  • 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.
  
  • 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
Martin Heinrich Klaproth, Jöns Jakob Berzelius, Wilhelm Hisinger   
William Crookes   
Discovery
In 1803   
In 1861   
Abundance
  
  
Abundance In Universe
1 * 10-6 %   
16
5 * 10-9 %   
32
Abundance In Sun
~0.0000004 %   
23
~0.0000001 %   
26
Abundance In Meteorites
0.00 %   
27
0.00 %   
99+
Abundance In Earth's Crust
0.01 %   
18
0.00 %   
99+
Abundance In Oceans
0.00 %   
33
0.00 %   
34
Uses
Uses & Benefits
  • 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.
  
  • 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
Chemical Industry   
Chemical Industry   
Medical Uses
Medical Research   
Medical Research   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Moderately Toxic   
Highly Toxic   
Present in Human Body
Yes   
Yes   
In Blood
0.00 Blood/mg dm-3   
30
0.00 Blood/mg dm-3   
34
In Bone
2.70 p.p.m.   
14
0.00 p.p.m.   
33
Physical Properties
Melting Point
795.00 °C   
99+
303.50 °C   
99+
Boiling Point
3,257.00 °C   
23
1,457.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silvery White   
Luster
Lustrous   
NA   
Hardness
  
  
Mohs Hardness
2.50   
14
1.20   
20
Brinell Hardness
186.00 MPa   
99+
26.50 MPa   
99+
Vickers Hardness
210.00 MPa   
32
Not Available   
Speed of Sound
2,100.00 m/s   
99+
818.00 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
Ce   
Tl   
Isotopes
  
  
Known Isotopes
30   
9
32   
7
Electronegativity
  
  
Pauling Electronegativity
1.12   
99+
1.62   
21
Sanderson Electronegativity
Not Available   
2.25   
5
Allred Rochow Electronegativity
1.08   
31
1.44   
17
Mulliken-Jaffe Electronegativity
Not Available   
1.96   
6
Allen Electronegativity
Not Available   
1.79   
13
Electropositivity
  
  
Pauling Electropositivity
2.88   
11
2.38   
33
Ionization Energies
  
  
1st Energy Level
534.40 kJ/mol   
99+
589.40 kJ/mol   
99+
2nd Energy Level
1,050.00 kJ/mol   
99+
1,971.00 kJ/mol   
14
3rd Energy Level
1,949.00 kJ/mol   
99+
2,878.00 kJ/mol   
32
4th Energy Level
3,547.00 kJ/mol   
99+
Not Available   
5th Energy Level
6,325.00 kJ/mol   
22
Not Available   
6th Energy Level
7,490.00 kJ/mol   
21
Not Available   
Electrochemical Equivalent
1.74 g/amp-hr   
99+
7.63 g/amp-hr   
2
Electron Work Function
2.84 eV   
39
3.84 eV   
28
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
58   
99+
81   
35
Electron Configuration
[Xe] 4f1 5d1 6s2   
[Xe] 4f14 5d10 6s2 6p1   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Cerium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
58   
99+
81   
35
Number of Neutrons
82   
99+
123   
20
Number of Electrons
58   
99+
81   
35
Radius of an Atom
  
  
Atomic Radius
181.80 pm   
12
170.00 pm   
22
Covalent Radius
204.00 pm   
8
145.00 pm   
39
Van der Waals Radius
235.00 pm   
17
196.00 pm   
30
Atomic Weight
140.12 amu   
99+
204.38 amu   
31
Atomic Volume
20.67 cm3/mol   
17
17.20 cm3/mol   
31
Adjacent Atomic Numbers
  
  
Previous Element
Lanthanum
  
Mercury
  
Next Element
Praseodymium
  
Lead
  
Valence Electron Potential
41.78 (-eV)   
99+
9.60 (-eV)   
99+
Lattice Constant
362.00 pm   
34
345.66 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.60   
6
Mechanical Properties
Density
  
  
Density At Room Temperature
6.77 g/cm3   
99+
11.85 g/cm3   
31
Density When Liquid (at m.p.)
6.55 g/cm3   
38
11.22 g/cm3   
13
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
34
16.90 (Pa)   
5
Vapor Pressure at 2000 K
1.04 (Pa)   
13
Not Available   
Elasticity properties
  
  
Shear Modulus
13.50 GPa   
99+
2.80 GPa   
99+
Bulk Modulus
21.50 GPa   
99+
43.00 GPa   
28
Young's Modulus
33.60 GPa   
99+
8.00 GPa   
99+
Poisson Ratio
0.24   
27
0.45   
2
Other Mechanical Properties
Ductile, Malleable   
Ductile, Sectile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
6.77   
99+
11.85   
22
Magnetic Ordering
Paramagnetic   
Diamagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
828.00 nΩ·m   
3
0.18 nΩ·m   
99+
Electrical Conductivity
0.01 106/cm Ω   
99+
0.06 106/cm Ω   
32
Electron Affinity
50.00 kJ/mol   
21
19.20 kJ/mol   
32
Thermal Properties
Specific Heat
0.19 J/(kg K)   
32
0.13 J/(kg K)   
39
Molar Heat Capacity
26.94 J/mol·K   
23
26.32 J/mol·K   
29
Thermal Conductivity
11.30 W/m·K   
99+
46.10 W/m·K   
33
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
6.30 µm/(m·K)   
99+
29.90 µm/(m·K)   
12
Enthalpy
  
  
Enthalpy of Vaporization
414.00 kJ/mol   
16
162.10 kJ/mol   
99+
Enthalpy of Fusion
5.46 kJ/mol   
99+
4.27 kJ/mol   
99+
Enthalpy of Atomization
381.00 kJ/mol   
23
179.90 kJ/mol   
99+
Standard Molar Entropy
72.00 J/mol.K   
12
64.20 J/mol.K   
19
Periodic Table >>
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