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Magnesium Rubidium Comparison

Magnesium
Rubidium
Rubidium Magnesium comparison


Periodic Table
Symbol
Mg  
Rb  
Group Number
2  
16
1  
17
Period Number
3  
5  
Block
s block  
s block  
Element Family
Alkaline Earth  
Alkali  
CAS Number
7439954  
99+
7440177  
99+
Space Group Name
P63/mmc  
Im_ 3m  
Space Group Number
194.00  
7
229.00  
2
Facts
Interesting Facts
  • Magnesium ions are present in every chlorophyll of every green plant .
  • Controlling Magnesium fire by pouring water on it will result in explosions.
  
  • Rubidium metal is 16th most common element found in the earth crust.
  • Rubidium metal also found in minerals as well as seawater.
  
Sources
By Electrolysis Process, In Ocean, Mining  
Obtained from Lithium Production.  
History
  
  
Who Discovered
Joseph Black  
Robert Bunsen and Gustav Kirchhoff  
Discovery
In 1755  
In 1861  
Abundance
  
  
Abundance In Universe
0.06 %  
3
0.00 %  
17
Abundance In Sun
0.07 %  
2
0.00 %  
17
Abundance In Meteorites
12.00 %  
2
0.00 %  
19
Abundance In Earth's Crust
2.90 %  
4
0.01 %  
18
Abundance In Oceans
0.13 %  
2
0.00 %  
7
Abundance In Humans
0.03 %  
5
0.00 %  
8
Uses
Uses & Benefits
  • Magnesium aluminum alloy improves the mechanical strength and welding characteristics and hence it is used in aeroplane and car manufacturing.
  • It is also used to remove sulfur from the molten iron and steel.
  
  • 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, Ammunition Industry, Automobile Industry, Chemical Industry, Pharmaceutical Industry  
-  
Medical Uses
-  
-  
Other Uses
Surgical Instruments Manufacturing  
Alloys, Research Purposes  
Biological Properties
  
  
Toxicity
Non Toxic  
Non Toxic  
Present in Human Body
Yes  
Yes  
In Blood
37.80 Blood/mg dm-3  
5
2.49 Blood/mg dm-3  
7
In Bone
1,800.00 p.p.m.  
4
5.00 p.p.m.  
13
Physical
Melting Point
650.00 °C  
99+
38.89 °C  
99+
Boiling Point
1,107.00 °C  
99+
688.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Gray  
Grayish White  
Luster
-  
-  
Hardness
  
  
Mohs Hardness
2.50  
15
0.30  
26
Brinell Hardness
260.00 MPa  
99+
0.22 MPa  
99+
Vickers Hardness
260.00 MPa  
99+
0.22 MPa  
99+
Speed of Sound
4,940.00 m/s  
15
1,300.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.49  
37
1.54  
35
Reflectivity
74.00 %  
9
52.00 %  
29
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Mg  
Rb  
Isotopes
  
  
Known Isotopes
15  
24
29  
10
Electronegativity
  
  
Pauling Electronegativity
1.31  
32
0.82  
99+
Sanderson Electronegativity
1.32  
24
0.31  
99+
Allred Rochow Electronegativity
1.23  
26
0.89  
99+
Mulliken-Jaffe Electronegativity
1.37  
30
0.69  
99+
Allen Electronegativity
1.29  
99+
0.71  
99+
Electropositivity
  
  
Pauling Electropositivity
2.69  
23
3.18  
3
Ionization Energies
  
  
1st Energy Level
737.70 kJ/mol  
24
403.00 kJ/mol  
99+
2nd Energy Level
1,450.70 kJ/mol  
99+
2,633.00 kJ/mol  
6
3rd Energy Level
7,732.70 kJ/mol  
5
3,860.00 kJ/mol  
11
4th Energy Level
10,542.50 kJ/mol  
4
5,080.00 kJ/mol  
28
5th Energy Level
13,630.00 kJ/mol  
3
6,850.00 kJ/mol  
31
6th Energy Level
18,020.00 kJ/mol  
3
8,140.00 kJ/mol  
31
7th Energy level
21,711.00 kJ/mol  
3
9,570.00 kJ/mol  
20
8th Energy Level
25,661.00 kJ/mol  
3
13,120.00 kJ/mol  
17
9th Energy Level
31,653.00 kJ/mol  
3
14,500.00 kJ/mol  
18
10th Energy Level
35,458.00 kJ/mol  
5
26,740.00 kJ/mol  
6
11th Energy Level
169,988.00 kJ/mol  
1
4,030.00 kJ/mol  
99+
12th Energy Level
189,368.00 kJ/mol  
1
4,030.00 kJ/mol  
99+
13th Energy Level
7,370.00 kJ/mol  
24
4,030.00 kJ/mol  
99+
14th Energy Level
737.70 kJ/mol  
99+
4,030.00 kJ/mol  
99+
15th Energy Level
73,700.00 kJ/mol  
21
40,300.00 kJ/mol  
99+
16th Energy Level
73,770.00 kJ/mol  
16
40,300.00 kJ/mol  
99+
17th Energy Level
737.70 kJ/mol  
37
403.00 kJ/mol  
99+
18th Energy Level
7,370.00 kJ/mol  
27
4,030.00 kJ/mol  
99+
19th Energy Level
737.70 kJ/mol  
34
403.00 kJ/mol  
99+
20th Energy Level
737.00 kJ/mol  
28
403.00 kJ/mol  
99+
21st Energy Level
737.70 kJ/mol  
99+
403.00 kJ/mol  
99+
22nd Energy Level
738.00 kJ/mol  
22
403.00 kJ/mol  
99+
23rd Energy Level
737.70 kJ/mol  
99+
403.00 kJ/mol  
99+
24th Energy Level
737.70 kJ/mol  
20
403.00 kJ/mol  
99+
25th Energy Level
737.70 kJ/mol  
20
403.00 kJ/mol  
99+
26th Energy Level
737.70 kJ/mol  
20
403.00 kJ/mol  
99+
27th Energy Level
737.70 kJ/mol  
19
403.00 kJ/mol  
99+
28th Energy Level
737.70 kJ/mol  
25
403.00 kJ/mol  
99+
29th Energy Level
737.70 kJ/mol  
26
403.00 kJ/mol  
99+
30th Energy Level
737.70 kJ/mol  
20
403.00 kJ/mol  
99+
Electrochemical Equivalent
0.45 g/amp-hr  
99+
3.19 g/amp-hr  
16
Electron Work Function
3.66 eV  
40
2.16 eV  
99+
Other Chemical Properties
Corrosion, Highly Inflammable, Ionization, Solubility  
Corrosion, Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
12  
99+
37  
99+
Electron Configuration
[Ne] 3s2  
[Kr] 5s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Body Centered Cubic (BCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Magnesium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
12  
99+
37  
99+
Number of Neutrons
12  
99+
48  
99+
Number of Electrons
12  
99+
37  
99+
Radius of an Atom
  
  
Atomic Radius
160.00 pm  
29
248.00 pm  
3
Covalent Radius
141.00 pm  
99+
220.00 pm  
4
Van der Waals Radius
173.00 pm  
99+
303.00 pm  
4
Atomic Weight
24.31 amu  
99+
85.47 amu  
99+
Atomic Volume
13.97 cm3/mol  
99+
55.90 cm3/mol  
3
Adjacent Atomic Numbers
  
  
Previous Element
Sodium
  
Gallium
  
Next Element
Aluminium
  
Strontium
  
Valence Electron Potential
40.00 (-eV)  
99+
9.47 (-eV)  
99+
Lattice Constant
320.94 pm  
99+
558.50 pm  
11
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.62  
15
1.59  
28
Mechanical
Density
  
  
Density At Room Temperature
1.74 g/cm3  
99+
1.53 g/cm3  
99+
Density When Liquid (at m.p.)
1.58 g/cm3  
99+
1.46 g/cm3  
99+
Tensile Strength
150.00 MPa  
25
30.00 MPa  
99+
Viscosity
0.00  
24
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
30
0.00 (Pa)  
35
Elasticity properties
  
  
Shear Modulus
17.00 GPa  
99+
2.50 GPa  
99+
Bulk Modulus
45.00 GPa  
29
2.50 GPa  
99+
Young's Modulus
45.00 GPa  
99+
2.40 GPa  
99+
Poisson Ratio
0.29  
15
0.37  
7
Other Mechanical Properties
-  
Ductile  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
1.74  
99+
1.53  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
8
0.00 H/m  
11
Susceptibility
0.00  
33
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
43.90 nΩ·m  
99+
128.00 nΩ·m  
26
Electrical Conductivity
0.23 106/cm Ω  
7
0.08 106/cm Ω  
29
Electron Affinity
0.00 kJ/mol  
99+
46.90 kJ/mol  
29
Thermal
Specific Heat
1.02 J/(kg K)  
4
0.36 J/(kg K)  
17
Molar Heat Capacity
24.87 J/mol·K  
99+
31.06 J/mol·K  
7
Thermal Conductivity
156.00 W/m·K  
8
58.20 W/m·K  
26
Critical Temperature
923.00 K  
99+
2,093.00 K  
18
Thermal Expansion
24.80 µm/(m·K)  
15
90.00 µm/(m·K)  
2
Enthalpy
  
  
Enthalpy of Vaporization
128.70 kJ/mol  
99+
69.20 kJ/mol  
99+
Enthalpy of Fusion
8.95 kJ/mol  
99+
2.19 kJ/mol  
99+
Enthalpy of Atomization
148.50 kJ/mol  
99+
82.00 kJ/mol  
99+
Standard Molar Entropy
32.70 J/mol.K  
99+
76.80 J/mol.K  
5
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