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Francium vs Rubidium

Francium
Rubidium
Rubidium vs Francium


Periodic Table
Symbol
Fr   
Rb   
Group Number
1   
17
1   
17
Period Number
7   
5   
Block
s block   
s block   
Element Family
Alkali   
Alkali   
CAS Number
7440735   
18
7440177   
99+
Space Group Name
Not Available   
Im_ 3m   
Space Group Number
Not Available   
229.00   
1
Facts
Interesting Facts
  • 223 Francium has the longest half life at 21.8.
  • Francium metal is produced by alpha decay in 227Actinium 227.
  
  • Rubidium metal is 16th most common element found in the earth crust.
  • Rubidium metal also found in minerals as well as seawater.
  
Sources
Formed by Decay Process, Mining   
Obtained from Lithium Production.   
History
  
  
Who Discovered
Marguerite Perey   
Robert Bunsen and Gustav Kirchhoff   
Discovery
In 1939   
In 1861   
Abundance
  
  
Abundance In Universe
Not Available   
1 * 10-6 %   
16
Abundance In Sun
~-9999 %   
~0.000003 %   
17
Abundance In Meteorites
Not Available   
0.00 %   
19
Abundance In Earth's Crust
Not Available   
0.01 %   
18
Abundance In Oceans
Not Available   
0.00 %   
7
Abundance In Humans
Not Available   
0.00 %   
7
Uses
Uses & Benefits
  • Francium has no known uses as it has a half life of only 22 minutes.
  
  • Rubidium's main application is in the glass manufacturing.
  • Rubidium can very easily get ionized and hence it is used for ion engines, but it is still less efficient than that of Caesium.
  
Industrial Uses
NA   
NA   
Medical Uses
NA   
NA   
Other Uses
NA   
Alloys, Research Purposes   
Biological Properties
  
  
Toxicity
NA   
Non Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
2.49 Blood/mg dm-3   
7
In Bone
0.00 p.p.m.   
36
5.00 p.p.m.   
13
Physical Properties
Melting Point
27.00 °C   
99+
38.89 °C   
99+
Boiling Point
677.00 °C   
99+
688.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
NA   
Grayish White   
Luster
NA   
NA   
Hardness
  
  
Mohs Hardness
Not Available   
0.30   
24
Brinell Hardness
Not Available   
0.22 MPa   
99+
Speed of Sound
Not Available   
1,300.00 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   
Rb   
Isotopes
  
  
Known Isotopes
33   
6
29   
10
Electronegativity
  
  
Pauling Electronegativity
0.70   
99+
0.82   
99+
Sanderson Electronegativity
Not Available   
0.31   
32
Allred Rochow Electronegativity
0.86   
99+
0.89   
40
Mulliken-Jaffe Electronegativity
0.68   
25
0.69   
24
Allen Electronegativity
0.67   
99+
0.71   
99+
Electropositivity
  
  
Pauling Electropositivity
3.30   
1
3.18   
3
Ionization Energies
  
  
1st Energy Level
380.00 kJ/mol   
99+
403.00 kJ/mol   
99+
2nd Energy Level
Not Available   
2,633.00 kJ/mol   
6
3rd Energy Level
Not Available   
3,860.00 kJ/mol   
11
4th Energy Level
Not Available   
5,080.00 kJ/mol   
18
5th Energy Level
Not Available   
6,850.00 kJ/mol   
19
6th Energy Level
Not Available   
8,140.00 kJ/mol   
20
7th Energy level
Not Available   
9,570.00 kJ/mol   
20
8th Energy Level
Not Available   
13,120.00 kJ/mol   
17
9th Energy Level
Not Available   
14,500.00 kJ/mol   
18
10th Energy Level
Not Available   
26,740.00 kJ/mol   
6
Electrochemical Equivalent
8.32 g/amp-hr   
1
3.19 g/amp-hr   
14
Electron Work Function
Not Available   
2.16 eV   
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Corrosion, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
87   
31
37   
99+
Electron Configuration
[Rn] 7s1   
[Kr] 5s1   
Crystal Structure
Body Centered Cubic (BCC)   
Body Centered Cubic (BCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
87   
31
37   
99+
Number of Neutrons
136   
17
48   
99+
Number of Electrons
87   
31
37   
99+
Radius of an Atom
  
  
Atomic Radius
Not Available   
248.00 pm   
2
Covalent Radius
260.00 pm   
1
220.00 pm   
4
Van der Waals Radius
348.00 pm   
1
303.00 pm   
3
Atomic Weight
223.00 amu   
27
85.47 amu   
99+
Atomic Volume
Not Available   
55.90 cm3/mol   
2
Adjacent Atomic Numbers
  
  
Previous Element
Polonium
  
Gallium
  
Next Element
Radium
  
Strontium
  
Valence Electron Potential
8.00 (-eV)   
99+
9.47 (-eV)   
99+
Lattice Constant
Not Available   
558.50 pm   
10
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+
1.53 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
1.46 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Bulk Modulus
Not Available   
2.50 GPa   
99+
Young's Modulus
Not Available   
2.40 GPa   
99+
Poisson Ratio
Not Available   
Not Available   
Other Mechanical Properties
NA   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
Not Available   
1.53   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Poor Conductor   
Conductor   
Resistivity
3.00 nΩ·m   
99+
128.00 nΩ·m   
26
Electrical Conductivity
0.03 106/cm Ω   
40
0.08 106/cm Ω   
24
Electron Affinity
Not Available   
46.90 kJ/mol   
24
Thermal Properties
Specific Heat
Not Available   
0.36 J/(kg K)   
17
Molar Heat Capacity
Not Available   
31.06 J/mol·K   
5
Thermal Conductivity
15.00 W/m·K   
99+
58.20 W/m·K   
26
Critical Temperature
Not Available   
2,093.00 K   
4
Thermal Expansion
Not Available   
90.00 µm/(m·K)   
2
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
69.20 kJ/mol   
99+
Enthalpy of Fusion
Not Available   
2.19 kJ/mol   
99+
Enthalpy of Atomization
71.00 kJ/mol   
99+
82.00 kJ/mol   
99+
Standard Molar Entropy
Not Available   
76.80 J/mol.K   
5
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