Home

Transition Metals + -

Actinide Metals + -

Lanthanide Metals + -

Post-Transition Metals + -

Alkaline Earth Metals + -

Compare Metals

Magnesium vs Rubidium

Magnesium
Rubidium
Rubidium vs Magnesium


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   
5
229.00   
1
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
6 * 10-2 %   
2
1 * 10-6 %   
16
Abundance In Sun
~0.07 %   
2
~0.000003 %   
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 %   
4
0.00 %   
7
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   
NA   
Medical Uses
NA   
NA   
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 Properties
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
NA   
NA   
Hardness
  
  
Mohs Hardness
2.50   
14
0.30   
24
Brinell Hardness
260.00 MPa   
36
0.22 MPa   
99+
Speed of Sound
4,940.00 m/s   
11
1,300.00 m/s   
99+
Optical Properties
  
  
Reflectivity
74.00 %   
7
Not Available   
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
Mg   
Rb   
Isotopes
  
  
Known Isotopes
15   
24
29   
10
Electronegativity
  
  
Pauling Electronegativity
1.31   
31
0.82   
99+
Sanderson Electronegativity
1.32   
18
0.31   
32
Allred Rochow Electronegativity
1.23   
25
0.89   
40
Mulliken-Jaffe Electronegativity
1.37   
16
0.69   
24
Allen Electronegativity
1.29   
35
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   
18
5th Energy Level
13,630.00 kJ/mol   
3
6,850.00 kJ/mol   
19
6th Energy Level
18,020.00 kJ/mol   
3
8,140.00 kJ/mol   
20
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
Not Available   
12th Energy Level
189,368.00 kJ/mol   
1
Not Available   
Electrochemical Equivalent
0.45 g/amp-hr   
99+
3.19 g/amp-hr   
14
Electron Work Function
3.66 eV   
29
2.16 eV   
99+
Other Chemical Properties
Corrosion, Highly Inflammable, Ionization, Solubility   
Corrosion, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
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   
27
248.00 pm   
2
Covalent Radius
141.00 pm   
99+
220.00 pm   
4
Van der Waals Radius
173.00 pm   
37
303.00 pm   
3
Atomic Weight
24.31 amu   
99+
85.47 amu   
99+
Atomic Volume
13.97 cm3/mol   
37
55.90 cm3/mol   
2
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   
10
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
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
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Shear Modulus
17.00 GPa   
37
Not Available   
Bulk Modulus
45.00 GPa   
25
2.50 GPa   
99+
Young's Modulus
45.00 GPa   
39
2.40 GPa   
99+
Poisson Ratio
0.29   
15
Not Available   
Other Mechanical Properties
NA   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
1.74   
99+
1.53   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
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   
24
Electron Affinity
0.00 kJ/mol   
40
46.90 kJ/mol   
24
Thermal Properties
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   
5
Thermal Conductivity
156.00 W/m·K   
8
58.20 W/m·K   
26
Critical Temperature
Not Available   
2,093.00 K   
4
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   
39
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
Periodic Table >>
<< All

Compare All Metals

All Metals

All Metals

Compare All Metals

Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!