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Beryllium vs Rubidium

Beryllium
Rubidium
Rubidium vs Beryllium


Periodic Table
Symbol
Be   
Rb   
Group Number
2   
16
1   
17
Period Number
2   
5   
Block
s block   
s block   
Element Family
Alkaline Earth   
Alkali   
CAS Number
7440417   
99+
7440177   
99+
Space Group Name
P63/mmc   
Im_ 3m   
Space Group Number
194.00   
5
229.00   
1
Facts
Interesting Facts
  • Beryllium is best anti corrosion metal.
  • Beryllium is the lightest metal and still it is stronger than steel.
  • It also finds various applications in Nuclear reactors as a reflector.
  
  • Rubidium metal is 16th most common element found in the earth crust.
  • Rubidium metal also found in minerals as well as seawater.
  
Sources
Earth's crust, Found in Minerals, Mining, Ores of metals, Ores of Minerals   
Obtained from Lithium Production.   
History
  
  
Who Discovered
Louis Nicolas Vauquelin   
Robert Bunsen and Gustav Kirchhoff   
Discovery
In 1797   
In 1861   
Abundance
  
  
Abundance In Universe
1 * 10-7 %   
23
1 * 10-6 %   
16
Abundance In Sun
~0.00000001 %   
29
~0.000003 %   
17
Abundance In Meteorites
0.00 %   
99+
0.00 %   
19
Abundance In Earth's Crust
0.00 %   
35
0.01 %   
18
Abundance In Oceans
0.00 %   
39
0.00 %   
7
Abundance In Humans
0.00 %   
19
0.00 %   
7
Uses
Uses & Benefits
  • Its alloys with copper or nickel are used in manufacturing Gyroscopes, springs, electrical contact and non sparking tools.
  • Beryllium Alloys are used as a material for aircraft, missiles, spacecraft and satellite.
  
  • 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, Electrical Industry, Electronic Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys, Research Purposes   
Biological Properties
  
  
Toxicity
Toxic   
Non Toxic   
Present in Human Body
Yes   
Yes   
In Blood
0.00 Blood/mg dm-3   
32
2.49 Blood/mg dm-3   
7
In Bone
0.00 p.p.m.   
32
5.00 p.p.m.   
13
Physical Properties
Melting Point
1,278.00 °C   
36
38.89 °C   
99+
Boiling Point
2,970.00 °C   
32
688.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
White Gray   
Grayish White   
Luster
Metallic   
NA   
Hardness
  
  
Mohs Hardness
5.50   
7
0.30   
24
Brinell Hardness
590.00 MPa   
21
0.22 MPa   
99+
Vickers Hardness
1,670.00 MPa   
4
Not Available   
Speed of Sound
12,890.00 m/s   
2
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
Be   
Rb   
Isotopes
  
  
Known Isotopes
9   
29
29   
10
Electronegativity
  
  
Pauling Electronegativity
1.57   
24
0.82   
99+
Sanderson Electronegativity
1.81   
12
0.31   
32
Allred Rochow Electronegativity
1.47   
14
0.89   
40
Mulliken-Jaffe Electronegativity
1.54   
12
0.69   
24
Allen Electronegativity
1.58   
23
0.71   
99+
Electropositivity
  
  
Pauling Electropositivity
2.43   
30
3.18   
3
Ionization Energies
  
  
1st Energy Level
899.50 kJ/mol   
7
403.00 kJ/mol   
99+
2nd Energy Level
1,757.10 kJ/mol   
23
2,633.00 kJ/mol   
6
3rd Energy Level
14,848.70 kJ/mol   
2
3,860.00 kJ/mol   
11
4th Energy Level
21,006.60 kJ/mol   
2
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
0.17 g/amp-hr   
99+
3.19 g/amp-hr   
14
Electron Work Function
4.98 eV   
6
2.16 eV   
99+
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes   
Corrosion, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
4   
99+
37   
99+
Electron Configuration
[He] 2s2   
[Kr] 5s1   
Crystal Structure
Hexagonal Close Packed (HCP)   
Body Centered Cubic (BCC)   
Crystal Lattice
HCP-Crystal-Structure-of-Beryllium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
4   
99+
37   
99+
Number of Neutrons
5   
99+
48   
99+
Number of Electrons
4   
99+
37   
99+
Radius of an Atom
  
  
Atomic Radius
112.00 pm   
99+
248.00 pm   
2
Covalent Radius
96.00 pm   
99+
220.00 pm   
4
Van der Waals Radius
153.00 pm   
99+
303.00 pm   
3
Atomic Weight
9.01 amu   
99+
85.47 amu   
99+
Atomic Volume
5.00 cm3/mol   
99+
55.90 cm3/mol   
2
Adjacent Atomic Numbers
  
  
Previous Element
Lithium
  
Gallium
  
Next Element
Sodium
  
Strontium
  
Valence Electron Potential
82.00 (-eV)   
15
9.47 (-eV)   
99+
Lattice Constant
228.58 pm   
99+
558.50 pm   
10
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
1.57   
18
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
1.85 g/cm3   
99+
1.53 g/cm3   
99+
Density When Liquid (at m.p.)
1.69 g/cm3   
99+
1.46 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
19
Not Available   
Elasticity properties
  
  
Shear Modulus
132.00 GPa   
7
Not Available   
Bulk Modulus
130.00 GPa   
13
2.50 GPa   
99+
Young's Modulus
287.00 GPa   
7
2.40 GPa   
99+
Poisson Ratio
0.03   
35
Not Available   
Other Mechanical Properties
NA   
Ductile   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
1.85   
99+
1.53   
99+
Magnetic Ordering
Diamagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Semiconductor   
Conductor   
Resistivity
36.00 nΩ·m   
99+
128.00 nΩ·m   
26
Electrical Conductivity
0.31 106/cm Ω   
5
0.08 106/cm Ω   
24
Electron Affinity
0.00 kJ/mol   
40
46.90 kJ/mol   
24
Thermal Properties
Specific Heat
1.82 J/(kg K)   
2
0.36 J/(kg K)   
17
Molar Heat Capacity
16.44 J/mol·K   
99+
31.06 J/mol·K   
5
Thermal Conductivity
200.00 W/m·K   
6
58.20 W/m·K   
26
Critical Temperature
Not Available   
2,093.00 K   
4
Thermal Expansion
11.30 µm/(m·K)   
34
90.00 µm/(m·K)   
2
Enthalpy
  
  
Enthalpy of Vaporization
294.70 kJ/mol   
30
69.20 kJ/mol   
99+
Enthalpy of Fusion
11.72 kJ/mol   
30
2.19 kJ/mol   
99+
Enthalpy of Atomization
326.40 kJ/mol   
30
82.00 kJ/mol   
99+
Standard Molar Entropy
9.50 J/mol.K   
99+
76.80 J/mol.K   
5
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