Francium Nobelium Comparison
Periodic Table
Symbol
Fr
No
Group Number
1
17
Not Available
Period Number
7
7
Block
s block
f block
Element Family
Alkali
Actinide
CAS Number
7440735
18
10028145
16
Space Group Name
Not Available
Not Available
Space Group Number
Not Available
Not Available
Facts
Interesting Facts
- 223 Francium has the longest half life at 21.8.
- Francium metal is produced by alpha decay in 227Actinium 227.
- The most stable isotope of Nobelium metal is No-259.
- No-259 has a half-life of fifty-eight minutes.
Sources
Formed by Decay Process, Mining
Bombarding Curium-246 or Curium-249 with Carbon-12 Nuclei, Found in Minerals, Mining
History
Who Discovered
Marguerite Perey
Joint Institute for Nuclear Research
Discovery
In 1939
In 1966
Abundance
Uses
Uses & Benefits
- Francium has no known uses as it has a half life of only 22 minutes.
- Currently known uses of Nobelium metal are limited to research purpose only.
Industrial Uses
NA
NA
Medical Uses
NA
NA
Other Uses
NA
Research Purposes
Biological Properties
Toxicity
NA
Unknown
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+
827.00 °C
99+
Boiling Point
677.00 °C
99+
Not Available
Appearance
Physical State
Solid
Solid
Color
NA
Unknown
Luster
NA
Unknown Luster
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
No
Isotopes
Known Isotopes
33
6
13
26
Electronegativity
Pauling Electronegativity
0.70
99+
1.30
32
Allred Rochow Electronegativity
0.86
99+
1.20
27
Mulliken-Jaffe Electronegativity
0.68
25
Not Available
Allen Electronegativity
0.67
99+
Not Available
Electropositivity
Pauling Electropositivity
3.30
1
2.70
22
Ionization Energies
1st Energy Level
380.00 kJ/mol
99+
642.00 kJ/mol
99+
2nd Energy Level
Not Available
1,254.00 kJ/mol
99+
3rd Energy Level
Not Available
2,643.00 kJ/mol
99+
4th Energy Level
Not Available
3,956.00 kJ/mol
39
Electrochemical Equivalent
8.32 g/amp-hr
1
4.83 g/amp-hr
4
Electron Work Function
Not Available
Not Available
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility
Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
Atomic Number
87
31
102
16
Electron Configuration
[Rn] 7s1
[Rn] 5f14 7s2
Crystal Structure
Body Centered Cubic (BCC)
Not Known
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
Unknown-Crystal-Structure-of-Nobelium.jpg#100
Atom
Number of Protons
87
31
102
16
Number of Neutrons
136
17
157
7
Number of Electrons
87
31
102
16
Radius of an Atom
Covalent Radius
260.00 pm
1
Not Available
Van der Waals Radius
348.00 pm
1
246.00 pm
8
Atomic Weight
223.00 amu
27
259.00 amu
13
Atomic Volume
Not Available
Not Available
Adjacent Atomic Numbers
Valence Electron Potential
8.00 (-eV)
99+
26.00 (-eV)
99+
Lattice Constant
Not Available
Not Available
Lattice Angles
NA
NA
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
1.87 g/cm3
99+
Not Available
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
Unknown
Magnetic Properties
Magnetic Characteristics
Magnetic Ordering
Paramagnetic
Unknown
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
Not Available
Molar Heat Capacity
Not Available
Not Available
Thermal Conductivity
15.00 W/m·K
99+
Not Available
Critical Temperature
Not Available
Not Available
Thermal Expansion
Not Available
Not Available
Enthalpy
Enthalpy of Atomization
71.00 kJ/mol
99+
Not Available
Standard Molar Entropy
Not Available
Not Available
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