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Lithium Rubidium Comparison

Lithium
Rubidium
Rubidium Lithium comparison


Periodic Table
Symbol
Li  
Rb  
Group Number
1  
17
1  
17
Period Number
2  
5  
Block
s block  
s block  
Element Family
Alkali  
Alkali  
CAS Number
7439932  
99+
7440177  
99+
Space Group Name
Im_ 3m  
Im_ 3m  
Space Group Number
229.00  
2
229.00  
2
Facts
Interesting Facts
  • Heat capacity of Lithium is very high.
  • Lithium inflammable and highly explosive metal, hence it has to be stored properly.
  
  • Rubidium metal is 16th most common element found in the earth crust.
  • Rubidium metal also found in minerals as well as seawater.
  
Sources
Found in Minerals, Mining  
Obtained from Lithium Production.  
History
  
  
Who Discovered
Johan August Arfwedson  
Robert Bunsen and Gustav Kirchhoff  
Discovery
In 1817  
In 1861  
Abundance
  
  
Abundance In Universe
0.00 %  
19
0.00 %  
17
Abundance In Sun
0.00 %  
11
0.00 %  
17
Abundance In Meteorites
0.00 %  
22
0.00 %  
19
Abundance In Earth's Crust
0.00 %  
99+
0.01 %  
18
Abundance In Oceans
0.00 %  
15
0.00 %  
7
Abundance In Humans
0.00 %  
19
0.00 %  
8
Uses
Uses & Benefits
  • The main usage of Lithium is manufacturing rechargeable batteries for electronic equipment and gadgets.
  • it is also used in manufacturing non-rechargeable batteries.
  
  • 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
Aerospace Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys, Research Purposes  
Biological Properties
  
  
Toxicity
-  
Non Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.00 Blood/mg dm-3  
27
2.49 Blood/mg dm-3  
7
In Bone
1.30 p.p.m.  
18
5.00 p.p.m.  
13
Physical
Melting Point
180.54 °C  
99+
38.89 °C  
99+
Boiling Point
1,347.00 °C  
99+
688.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Grayish White  
Luster
-  
-  
Hardness
  
  
Mohs Hardness
0.60  
23
0.30  
26
Brinell Hardness
5.00 MPa  
99+
0.22 MPa  
99+
Vickers Hardness
5.30 MPa  
99+
0.22 MPa  
99+
Speed of Sound
6,000.00 m/s  
6
1,300.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.35  
99+
1.54  
35
Reflectivity
95.00 %  
2
52.00 %  
29
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Li  
Rb  
Isotopes
  
  
Known Isotopes
8  
30
29  
10
Electronegativity
  
  
Pauling Electronegativity
0.98  
99+
0.82  
99+
Sanderson Electronegativity
0.89  
99+
0.31  
99+
Allred Rochow Electronegativity
0.97  
39
0.89  
99+
Mulliken-Jaffe Electronegativity
0.97  
99+
0.69  
99+
Allen Electronegativity
0.91  
99+
0.71  
99+
Electropositivity
  
  
Pauling Electropositivity
3.02  
8
3.18  
3
Ionization Energies
  
  
1st Energy Level
520.20 kJ/mol  
99+
403.00 kJ/mol  
99+
2nd Energy Level
7,298.10 kJ/mol  
3
2,633.00 kJ/mol  
6
3rd Energy Level
11,815.00 kJ/mol  
4
3,860.00 kJ/mol  
11
4th Energy Level
520.20 kJ/mol  
99+
5,080.00 kJ/mol  
28
5th Energy Level
5,200.00 kJ/mol  
99+
6,850.00 kJ/mol  
31
6th Energy Level
5,200.00 kJ/mol  
99+
8,140.00 kJ/mol  
31
7th Energy level
5,202.00 kJ/mol  
99+
9,570.00 kJ/mol  
20
8th Energy Level
730.00 kJ/mol  
99+
13,120.00 kJ/mol  
17
9th Energy Level
5,200.00 kJ/mol  
99+
14,500.00 kJ/mol  
18
10th Energy Level
520.00 kJ/mol  
99+
26,740.00 kJ/mol  
6
11th Energy Level
5,202.00 kJ/mol  
99+
4,030.00 kJ/mol  
99+
12th Energy Level
5,200.00 kJ/mol  
99+
4,030.00 kJ/mol  
99+
13th Energy Level
5,200.00 kJ/mol  
99+
4,030.00 kJ/mol  
99+
14th Energy Level
520.20 kJ/mol  
99+
4,030.00 kJ/mol  
99+
15th Energy Level
52,000.00 kJ/mol  
99+
40,300.00 kJ/mol  
99+
16th Energy Level
52,000.00 kJ/mol  
99+
40,300.00 kJ/mol  
99+
17th Energy Level
520.20 kJ/mol  
99+
403.00 kJ/mol  
99+
18th Energy Level
520.00 kJ/mol  
99+
4,030.00 kJ/mol  
99+
19th Energy Level
520.20 kJ/mol  
99+
403.00 kJ/mol  
99+
20th Energy Level
520.00 kJ/mol  
99+
403.00 kJ/mol  
99+
21st Energy Level
520.20 kJ/mol  
99+
403.00 kJ/mol  
99+
22nd Energy Level
520.00 kJ/mol  
99+
403.00 kJ/mol  
99+
23rd Energy Level
520.20 kJ/mol  
99+
403.00 kJ/mol  
99+
24th Energy Level
520.20 kJ/mol  
99+
403.00 kJ/mol  
99+
25th Energy Level
520.00 kJ/mol  
99+
403.00 kJ/mol  
99+
26th Energy Level
520.20 kJ/mol  
99+
403.00 kJ/mol  
99+
27th Energy Level
520.20 kJ/mol  
99+
403.00 kJ/mol  
99+
28th Energy Level
520.20 kJ/mol  
99+
403.00 kJ/mol  
99+
29th Energy Level
520.20 kJ/mol  
99+
403.00 kJ/mol  
99+
30th Energy Level
520.00 kJ/mol  
99+
403.00 kJ/mol  
99+
Electrochemical Equivalent
0.26 g/amp-hr  
99+
3.19 g/amp-hr  
16
Electron Work Function
2.90 eV  
99+
2.16 eV  
99+
Other Chemical Properties
Corrosion, Flammable, Ionization, Radioactive Isotopes  
Corrosion, Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
3  
99+
37  
99+
Electron Configuration
[He] 2s1  
[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
3  
99+
37  
99+
Number of Neutrons
4  
99+
48  
99+
Number of Electrons
3  
99+
37  
99+
Radius of an Atom
  
  
Atomic Radius
152.00 pm  
33
248.00 pm  
3
Covalent Radius
128.00 pm  
99+
220.00 pm  
4
Van der Waals Radius
182.00 pm  
99+
303.00 pm  
4
Atomic Weight
6.94 amu  
99+
85.47 amu  
99+
Atomic Volume
13.10 cm3/mol  
99+
55.90 cm3/mol  
3
Adjacent Atomic Numbers
  
  
Previous Element
No Previous Element  
Gallium
  
Next Element
Beryllium
  
Strontium
  
Valence Electron Potential
19.00 (-eV)  
99+
9.47 (-eV)  
99+
Lattice Constant
351.00 pm  
99+
558.50 pm  
11
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.62  
16
1.59  
28
Mechanical
Density
  
  
Density At Room Temperature
0.53 g/cm3  
99+
1.53 g/cm3  
99+
Density When Liquid (at m.p.)
0.51 g/cm3  
99+
1.46 g/cm3  
99+
Tensile Strength
60.00 MPa  
35
30.00 MPa  
99+
Viscosity
0.00  
10
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
109.00 (Pa)  
2
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
35
Elasticity properties
  
  
Shear Modulus
4.20 GPa  
99+
2.50 GPa  
99+
Bulk Modulus
11.00 GPa  
99+
2.50 GPa  
99+
Young's Modulus
4.90 GPa  
99+
2.40 GPa  
99+
Poisson Ratio
0.36  
8
0.37  
7
Other Mechanical Properties
-  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
0.53  
99+
1.53  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
11
0.00 H/m  
11
Susceptibility
0.00  
16
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
92.80 nΩ·m  
33
128.00 nΩ·m  
26
Electrical Conductivity
0.11 106/cm Ω  
22
0.08 106/cm Ω  
29
Electron Affinity
59.60 kJ/mol  
20
46.90 kJ/mol  
29
Thermal
Specific Heat
3.60 J/(kg K)  
1
0.36 J/(kg K)  
17
Molar Heat Capacity
24.86 J/mol·K  
99+
31.06 J/mol·K  
7
Thermal Conductivity
84.80 W/m·K  
20
58.20 W/m·K  
26
Critical Temperature
3,223.00 K  
5
2,093.00 K  
18
Thermal Expansion
46.00 µm/(m·K)  
7
90.00 µm/(m·K)  
2
Enthalpy
  
  
Enthalpy of Vaporization
134.70 kJ/mol  
99+
69.20 kJ/mol  
99+
Enthalpy of Fusion
3.00 kJ/mol  
99+
2.19 kJ/mol  
99+
Enthalpy of Atomization
160.70 kJ/mol  
99+
82.00 kJ/mol  
99+
Standard Molar Entropy
29.10 J/mol.K  
99+
76.80 J/mol.K  
5
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