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Thallium vs Francium

Thallium
Francium
Francium vs Thallium


Periodic Table
Symbol
Tl   
Fr   
Group Number
13   
5
1   
17
Period Number
6   
7   
Block
p block   
s block   
Element Family
Post-​Transition   
Alkali   
CAS Number
7440280   
99+
7440735   
18
Space Group Name
P63/mmc   
Not Available   
Space Group Number
194.00   
5
Not Available   
Facts
Interesting Facts
  • Compounds of Thallium metal are highly Toxic.
  • Thallium metal is being suspected as a human carcinogen.
  
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
Sources
Found As a By-product, Ores of metals, Ores of Minerals   
Formed by Decay Process, Mining   
History
  
  
Who Discovered
William Crookes   
Marguerite Perey   
Discovery
In 1861   
In 1939   
Abundance
  
  
Abundance In Universe
5 * 10-9 %   
32
Not Available   
Abundance In Sun
~0.0000001 %   
26
~-9999 %   
Abundance In Meteorites
0.00 %   
99+
Not Available   
Abundance In Earth's Crust
0.00 %   
99+
Not Available   
Abundance In Oceans
0.00 %   
34
Not Available   
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.
  
  • Francium has no known uses as it has a half life of only 22 minutes.
  
Industrial Uses
Chemical Industry   
NA   
Medical Uses
Medical Research   
NA   
Other Uses
Alloys   
NA   
Biological Properties
  
  
Toxicity
Highly Toxic   
NA   
Present in Human Body
Yes   
No   
In Blood
0.00 Blood/mg dm-3   
34
0.00 Blood/mg dm-3   
37
In Bone
0.00 p.p.m.   
33
0.00 p.p.m.   
36
Physical Properties
Melting Point
303.50 °C   
99+
27.00 °C   
99+
Boiling Point
1,457.00 °C   
99+
677.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
NA   
Luster
NA   
NA   
Hardness
  
  
Mohs Hardness
1.20   
20
Not Available   
Brinell Hardness
26.50 MPa   
99+
Not Available   
Speed of Sound
818.00 m/s   
99+
Not Available   
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   
Fr   
Isotopes
  
  
Known Isotopes
32   
7
33   
6
Electronegativity
  
  
Pauling Electronegativity
1.62   
21
0.70   
99+
Sanderson Electronegativity
2.25   
5
Not Available   
Allred Rochow Electronegativity
1.44   
17
0.86   
99+
Mulliken-Jaffe Electronegativity
1.96   
6
0.68   
25
Allen Electronegativity
1.79   
13
0.67   
99+
Electropositivity
  
  
Pauling Electropositivity
2.38   
33
3.30   
1
Ionization Energies
  
  
1st Energy Level
589.40 kJ/mol   
99+
380.00 kJ/mol   
99+
2nd Energy Level
1,971.00 kJ/mol   
14
Not Available   
3rd Energy Level
2,878.00 kJ/mol   
32
Not Available   
Electrochemical Equivalent
7.63 g/amp-hr   
2
8.32 g/amp-hr   
1
Electron Work Function
3.84 eV   
28
Not Available   
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
81   
35
87   
31
Electron Configuration
[Xe] 4f14 5d10 6s2 6p1   
[Rn] 7s1   
Crystal Structure
Hexagonal Close Packed (HCP)   
Body Centered Cubic (BCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
81   
35
87   
31
Number of Neutrons
123   
20
136   
17
Number of Electrons
81   
35
87   
31
Radius of an Atom
  
  
Atomic Radius
170.00 pm   
22
Not Available   
Covalent Radius
145.00 pm   
39
260.00 pm   
1
Van der Waals Radius
196.00 pm   
30
348.00 pm   
1
Atomic Weight
204.38 amu   
31
223.00 amu   
27
Atomic Volume
17.20 cm3/mol   
31
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Mercury
  
Polonium
  
Next Element
Lead
  
Radium
  
Valence Electron Potential
9.60 (-eV)   
99+
8.00 (-eV)   
99+
Lattice Constant
345.66 pm   
99+
Not Available   
Lattice Angles
π/2, π/2, 2 π/3   
NA   
Lattice C/A Ratio
1.60   
6
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
11.85 g/cm3   
31
1.87 g/cm3   
99+
Density When Liquid (at m.p.)
11.22 g/cm3   
13
Not Available   
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
16.90 (Pa)   
5
Not Available   
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+
Not Available   
Poisson Ratio
0.45   
2
Not Available   
Other Mechanical Properties
Ductile, Sectile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
11.85   
22
Not Available   
Magnetic Ordering
Diamagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Poor Conductor   
Resistivity
0.18 nΩ·m   
99+
3.00 nΩ·m   
99+
Electrical Conductivity
0.06 106/cm Ω   
32
0.03 106/cm Ω   
40
Electron Affinity
19.20 kJ/mol   
32
Not Available   
Thermal Properties
Specific Heat
0.13 J/(kg K)   
39
Not Available   
Molar Heat Capacity
26.32 J/mol·K   
29
Not Available   
Thermal Conductivity
46.10 W/m·K   
33
15.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
29.90 µm/(m·K)   
12
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
162.10 kJ/mol   
99+
Not Available   
Enthalpy of Fusion
4.27 kJ/mol   
99+
Not Available   
Enthalpy of Atomization
179.90 kJ/mol   
99+
71.00 kJ/mol   
99+
Standard Molar Entropy
64.20 J/mol.K   
19
Not Available   
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