Symbol
Rb
  
In
  
Period Number
5
  
5
  
Block
s block
  
p block
  
Element Family
Alkali
  
Post-Transition
  
Space Group Name
Im_ 3m
  
I4/mmm
  
Interesting Facts
- Rubidium metal is 16th most common element found in the earth crust.
- Rubidium metal also found in minerals as well as seawater.
  
- Luster of Indium is bright in nature.
- Reich and richer were looking for thallium in zinc metal and they discovered Indium metal.
  
Sources
Obtained from Lithium Production.
  
Mining, Ores of metals
  
History
  
  
Who Discovered
Robert Bunsen and Gustav Kirchhoff
  
Ferdinand Reich and Hieronymous Theodor Richter
  
Discovery
In 1861
  
In 1863
  
Abundance
  
  
Abundance In Sun
~0.000003 %
  
17
~0.0000004 %
  
23
Abundance In Earth's Crust
Abundance In Humans
Not Available
  
Uses & Benefits
- 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.
  
- It is used to produce indium tin oxide (ITO), it is used in manufacturing touch screens, flat screen TVs and solar panels.
- Its nitride, phosphide and antimonide are used in transistors and microchips.
  
Industrial Uses
NA
  
Aerospace Industry, Automobile Industry
  
Medical Uses
NA
  
Medical Research
  
Other Uses
Alloys, Research Purposes
  
Alloys, In Nuclear Reactors
  
Biological Properties
  
  
Toxicity
Non Toxic
  
Non Toxic
  
Present in Human Body
Yes
  
Yes
  
In Blood
2.49 Blood/mg dm-3
  
7
Not Available
  
In Bone
5.00 p.p.m.
  
13
Not Available
  
Boiling Point
2,000.00 °C
  
99+
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Grayish White
  
Silvery Gray
  
Luster
NA
  
Lustrous
  
Hardness
  
  
Speed of Sound
1,300.00 m/s
  
99+
1,215.00 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 Formula
Rb
  
In
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
403.00 kJ/mol
  
99+
558.30 kJ/mol
  
99+
2nd Energy Level
2,633.00 kJ/mol
  
6
1,820.70 kJ/mol
  
18
3rd Energy Level
3,860.00 kJ/mol
  
11
2,704.00 kJ/mol
  
39
4th Energy Level
5,080.00 kJ/mol
  
18
5,210.00 kJ/mol
  
17
5th Energy Level
6,850.00 kJ/mol
  
19
Not Available
  
6th Energy Level
8,140.00 kJ/mol
  
20
Not Available
  
7th Energy level
9,570.00 kJ/mol
  
20
Not Available
  
8th Energy Level
13,120.00 kJ/mol
  
17
Not Available
  
9th Energy Level
14,500.00 kJ/mol
  
18
Not Available
  
10th Energy Level
26,740.00 kJ/mol
  
6
Not Available
  
Electrochemical Equivalent
3.19 g/amp-hr
  
14
1.43 g/amp-hr
  
99+
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity
  
Ionization, Radioactive Isotopes, Radioactivity, Solubility
  
Electron Configuration
[Kr] 5s1
  
[Kr] 4d10 5s2 5p1
  
Crystal Structure
Body Centered Cubic (BCC)
  
Tetragonal (TETR)
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
TETR-Crystal-Structure-of-Indium.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Weight
114.82 amu
  
99+
Atomic Volume
55.90 cm3/mol
  
2
15.70 cm3/mol
  
33
Adjacent Atomic Numbers
  
  
Valence Electron Potential
9.47 (-eV)
  
99+
54.00 (-eV)
  
25
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Density
  
  
Density At Room Temperature
1.53 g/cm
3
  
99+
7.31 g/cm
3
  
99+
Density When Liquid (at m.p.)
1.46 g/cm3
  
99+
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Elasticity properties
  
  
Bulk Modulus
Not Available
  
Poisson Ratio
Not Available
  
Not Available
  
Other Mechanical Properties
Ductile
  
Ductile, Malleable
  
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic
  
Diamagnetic
  
Electrical Properties
  
  
Electrical Property
Conductor
  
Conductor
  
Resistivity
128.00 nΩ·m
  
26
Electrical Conductivity
0.08 10
6/cm Ω
  
24
0.12 10
6/cm Ω
  
17
Electron Affinity
46.90 kJ/mol
  
24
28.90 kJ/mol
  
31
Specific Heat
0.36 J/(kg K)
  
17
0.23 J/(kg K)
  
27
Molar Heat Capacity
31.06 J/mol·K
  
5
26.74 J/mol·K
  
25
Thermal Conductivity
58.20 W/m·K
  
26
81.80 W/m·K
  
21
Critical Temperature
Not Available
  
Thermal Expansion
90.00 µm/(m·K)
  
2
32.10 µm/(m·K)
  
9
Enthalpy
  
  
Enthalpy of Vaporization
69.20 kJ/mol
  
99+
226.40 kJ/mol
  
40
Enthalpy of Fusion
2.19 kJ/mol
  
99+
3.28 kJ/mol
  
99+
Enthalpy of Atomization
82.00 kJ/mol
  
99+
242.70 kJ/mol
  
99+
Standard Molar Entropy
76.80 J/mol.K
  
5
57.80 J/mol.K
  
22