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Protactinium Francium Comparison

Protactinium
Francium
Francium Protactinium comparison


Periodic Table
Symbol
Pa   
Fr   
Group Number
Not Available   
1   
17
Period Number
7   
7   
Block
f block   
s block   
Element Family
Actinide   
Alkali   
CAS Number
7440133   
99+
7440735   
18
Space Group Name
I4/mmm   
Not Available   
Space Group Number
139.00   
8
Not Available   
Facts
Interesting Facts
  • Protactinium metal has 29 isotopes.
  • Isotopes of Protactinium-231 used in nuclear weapon.
  
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
Sources
Found in Uranium Ores, Mining, Ores of metals   
Formed by Decay Process, Mining   
History
  
  
Who Discovered
William Crookes   
Marguerite Perey   
Discovery
In 1900   
In 1939   
Abundance
  
  
Abundance In Earth's Crust
0.00 %   
99+
Not Available   
Abundance In Oceans
0.00 %   
99+
Not Available   
Uses
Uses & Benefits
  • Currently known uses of Protactinium metal are limited to research purpose only.
  
  • Francium has no known uses as it has a half life of only 22 minutes.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
NA   
NA   
Biological Properties
  
  
Toxicity
Highly Toxic   
NA   
Present in Human Body
No   
No   
In Blood
0.00 Blood/mg dm-3   
37
0.00 Blood/mg dm-3   
37
In Bone
0.00 p.p.m.   
36
0.00 p.p.m.   
36
Physical Properties
Melting Point
1,568.00 °C   
21
27.00 °C   
99+
Boiling Point
4,027.00 °C   
12
677.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
NA   
Luster
Metallic   
NA   
Hardness
  
  
Speed of Sound
Not Available   
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
Pa   
Fr   
Isotopes
  
  
Known Isotopes
27   
12
33   
6
Electronegativity
  
  
Pauling Electronegativity
1.50   
27
0.70   
99+
Allred Rochow Electronegativity
1.14   
28
0.86   
99+
Mulliken-Jaffe Electronegativity
Not Available   
0.68   
25
Allen Electronegativity
Not Available   
0.67   
99+
Electropositivity
  
  
Pauling Electropositivity
2.50   
27
3.30   
1
Ionization Energies
  
  
1st Energy Level
568.00 kJ/mol   
99+
380.00 kJ/mol   
99+
2nd Energy Level
1,128.00 kJ/mol   
99+
Not Available   
3rd Energy Level
1,814.00 kJ/mol   
99+
Not Available   
4th Energy Level
2,991.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.72 g/amp-hr   
99+
8.32 g/amp-hr   
1
Electron Work Function
Not Available   
Not Available   
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
91   
27
87   
31
Electron Configuration
[Rn] 5f2 6d1 7s2   
[Rn] 7s1   
Crystal Structure
Tetragonal (TETR)   
Body Centered Cubic (BCC)   
Crystal Lattice
TETR-Crystal-Structure-of-Protactinium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
91   
27
87   
31
Number of Neutrons
122   
21
136   
17
Number of Electrons
91   
27
87   
31
Radius of an Atom
  
  
Atomic Radius
163.00 pm   
25
Not Available   
Covalent Radius
200.00 pm   
11
260.00 pm   
1
Van der Waals Radius
243.00 pm   
11
348.00 pm   
1
Atomic Weight
231.04 amu   
24
223.00 amu   
27
Atomic Volume
15.00 cm3/mol   
34
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Thorium
  
Polonium
  
Next Element
Uranium
  
Radium
  
Valence Electron Potential
92.00 (-eV)   
11
8.00 (-eV)   
99+
Lattice Constant
392.50 pm   
23
Not Available   
Lattice Angles
π/2, π/2, π/2   
NA   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
15.37 g/cm3   
20
1.87 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
Unknown   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
15.37   
12
Not Available   
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Poor Conductor   
Resistivity
177.00 nΩ·m   
21
3.00 nΩ·m   
99+
Electrical Conductivity
0.05 106/cm Ω   
34
0.03 106/cm Ω   
40
Thermal Properties
Specific Heat
0.12 J/(kg K)   
40
Not Available   
Molar Heat Capacity
Not Available   
Not Available   
Thermal Conductivity
47.00 W/m·K   
32
15.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
9.90 µm/(m·K)   
40
Not Available   
Enthalpy
  
  
Enthalpy of Fusion
12.34 kJ/mol   
28
Not Available   
Enthalpy of Atomization
Not Available   
71.00 kJ/mol   
99+
Standard Molar Entropy
198.10 J/mol.K   
1
Not Available   
Summary >>
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