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Francium vs Thallium

Francium
Thallium
Thallium vs Francium


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