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Francium vs Actinium

Francium
Actinium
Actinium vs Francium


Periodic Table
Symbol
Fr  
Ac  
Group Number
1  
17
Not Available  
Period Number
7  
7  
Block
s block  
f block  
Element Family
Alkali  
Actinide  
CAS Number
7440735  
18
7440348  
99+
Space Group Name
Not Available  
Fm_ 3m  
Space Group Number
Not Available  
225.00  
2
Facts
Interesting Facts
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
Not Available  
Sources
Formed by Decay Process, Mining  
Obtained by Treating Radium with Neutrons, Ores of metals  
History
  
  
Who Discovered
Marguerite Perey  
Friedrich Oskar Giesel  
Discovery
In 1939  
In 1902  
Abundance
  
  
Uses
Uses & Benefits
  • Francium has no known uses as it has a half life of only 22 minutes.
  
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
Industrial Uses
NA  
NA  
Medical Uses
NA  
NA  
Other Uses
NA  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
NA  
Toxic  
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
27.00 °C  
99+
1,227.00 °C  
38
Boiling Point
677.00 °C  
99+
3,200.00 °C  
26
Appearance
  
  
Physical State
Solid  
Solid  
Color
NA  
Silvery White  
Luster
NA  
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
Fr  
Ac  
Isotopes
  
  
Known Isotopes
33  
6
29  
10
Electronegativity
  
  
Pauling Electronegativity
0.70  
99+
1.10  
99+
Allred Rochow Electronegativity
0.86  
99+
1.00  
36
Mulliken-Jaffe Electronegativity
0.68  
25
Not Available  
Allen Electronegativity
0.67  
99+
Not Available  
Electropositivity
  
  
Pauling Electropositivity
3.30  
1
2.90  
10
Ionization Energies
  
  
1st Energy Level
380.00 kJ/mol  
99+
499.00 kJ/mol  
99+
2nd Energy Level
Not Available  
1,170.00 kJ/mol  
99+
3rd Energy Level
Not Available  
1,900.00 kJ/mol  
99+
4th Energy Level
Not Available  
4,700.00 kJ/mol  
23
Electrochemical Equivalent
8.32 g/amp-hr  
1
2.82 g/amp-hr  
18
Electron Work Function
Not Available  
Not Available  
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic Properties
Atomic Number
87  
31
89  
29
Electron Configuration
[Rn] 7s1  
[Rn] 6d1 7s2  
Crystal Structure
Body Centered Cubic (BCC)  
Face Centered Cubic (FCC)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
FCC-Crystal-Structure-of-Actinium.jpg#100  
Atom
  
  
Number of Protons
87  
31
89  
29
Number of Neutrons
136  
17
138  
16
Number of Electrons
87  
31
89  
29
Radius of an Atom
  
  
Atomic Radius
Not Available  
195.00 pm  
7
Covalent Radius
260.00 pm  
1
Not Available  
Van der Waals Radius
348.00 pm  
1
Not Available  
Atomic Weight
223.00 amu  
27
227.00 amu  
25
Atomic Volume
Not Available  
22.54 cm3/mol  
11
Adjacent Atomic Numbers
  
  
Previous Element
Polonium
  
Radium
  
Next Element
Radium
  
Thorium
  
Valence Electron Potential
8.00 (-eV)  
99+
38.60 (-eV)  
99+
Lattice Constant
Not Available  
567.00 pm  
8
Lattice Angles
NA  
π/2, π/2, π/2  
Lattice C/A Ratio
Not Available  
Not Available  
Mechanical Properties
Density
  
  
Density At Room Temperature
1.87 g/cm3  
99+
10.00 g/cm3  
37
Tensile Strength
Not Available  
Not Available  
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Elasticity properties
  
  
Poisson Ratio
Not Available  
Not Available  
Other Mechanical Properties
NA  
NA  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available  
10.07  
28
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Poor Conductor  
Unknown  
Resistivity
3.00 nΩ·m  
99+
Not Available  
Electrical Conductivity
0.03 106/cm Ω  
40
Not Available  
Thermal Properties
Specific Heat
Not Available  
0.12 J/(kg K)  
40
Molar Heat Capacity
Not Available  
27.20 J/mol·K  
18
Thermal Conductivity
15.00 W/m·K  
99+
12.00 W/m·K  
99+
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
Not Available  
Not Available  
Enthalpy
  
  
Enthalpy of Atomization
71.00 kJ/mol  
99+
301.00 kJ/mol  
36
Standard Molar Entropy
Not Available  
56.50 J/mol.K  
25
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