Actinium Francium Comparison
Periodic Table
Symbol
Ac
Fr
Group Number
Not Available
1
17
Period Number
7
7
Block
f block
s block
Element Family
Actinide
Alkali
CAS Number
7440348
99+
7440735
18
Space Group Name
Fm_ 3m
Not Available
Space Group Number
225.00
2
Not Available
Facts
Interesting Facts
Not Available
- 223 Francium has the longest half life at 21.8.
- Francium metal is produced by alpha decay in 227Actinium 227.
Sources
Obtained by Treating Radium with Neutrons, Ores of metals
Formed by Decay Process, Mining
History
Who Discovered
Friedrich Oskar Giesel
Marguerite Perey
Discovery
In 1902
In 1939
Abundance
Uses
Uses & Benefits
- Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
- 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
Alloys, Nuclear Research, Research Purposes
NA
Biological Properties
Toxicity
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
1,227.00 °C
38
27.00 °C
99+
Boiling Point
3,200.00 °C
26
677.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
NA
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
Ac
Fr
Isotopes
Known Isotopes
29
10
33
6
Electronegativity
Pauling Electronegativity
1.10
99+
0.70
99+
Allred Rochow Electronegativity
1.00
36
0.86
99+
Mulliken-Jaffe Electronegativity
Not Available
0.68
25
Allen Electronegativity
Not Available
0.67
99+
Electropositivity
Pauling Electropositivity
2.90
10
3.30
1
Ionization Energies
1st Energy Level
499.00 kJ/mol
99+
380.00 kJ/mol
99+
2nd Energy Level
1,170.00 kJ/mol
99+
Not Available
3rd Energy Level
1,900.00 kJ/mol
99+
Not Available
4th Energy Level
4,700.00 kJ/mol
23
Not Available
Electrochemical Equivalent
2.82 g/amp-hr
18
8.32 g/amp-hr
1
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Atomic Properties
Atomic Number
89
29
87
31
Electron Configuration
[Rn] 6d1 7s2
[Rn] 7s1
Crystal Structure
Face Centered Cubic (FCC)
Body Centered Cubic (BCC)
Crystal Lattice
FCC-Crystal-Structure-of-Actinium.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
89
29
87
31
Number of Neutrons
138
16
136
17
Number of Electrons
89
29
87
31
Radius of an Atom
Atomic Radius
195.00 pm
7
Not Available
Covalent Radius
Not Available
260.00 pm
1
Van der Waals Radius
Not Available
348.00 pm
1
Atomic Weight
227.00 amu
25
223.00 amu
27
Atomic Volume
22.54 cm3/mol
11
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
38.60 (-eV)
99+
8.00 (-eV)
99+
Lattice Constant
567.00 pm
8
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
10.00 g/cm3
37
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
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
10.07
28
Not Available
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Unknown
Poor Conductor
Resistivity
Not Available
3.00 nΩ·m
99+
Electrical Conductivity
Not Available
0.03 106/cm Ω
40
Thermal Properties
Specific Heat
0.12 J/(kg K)
40
Not Available
Molar Heat Capacity
27.20 J/mol·K
18
Not Available
Thermal Conductivity
12.00 W/m·K
99+
15.00 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Enthalpy of Atomization
301.00 kJ/mol
36
71.00 kJ/mol
99+
Standard Molar Entropy
56.50 J/mol.K
25
Not Available
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