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Rubidium vs Strontium

Rubidium
Strontium
Strontium vs Rubidium


Periodic Table
Symbol
Rb   
Sr   
Group Number
1   
17
2   
16
Period Number
5   
5   
Block
s block   
s block   
Element Family
Alkali   
Alkaline Earth   
CAS Number
7440177   
99+
7440246   
99+
Space Group Name
Im_ 3m   
Fm_ 3m   
Space Group Number
229.00   
1
225.00   
2
Facts
Interesting Facts
  • Rubidium metal is 16th most common element found in the earth crust.
  • Rubidium metal also found in minerals as well as seawater.
  
  • Strontium element is softer than Calcium.
  • Silvery Strontium turns yellow, if exposed to air.
  
Sources
Obtained from Lithium Production.   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Robert Bunsen and Gustav Kirchhoff   
William Cruickshank   
Discovery
In 1861   
In 1787   
Abundance
  
  
Abundance In Universe
1 * 10-6 %   
16
4 * 10-6 %   
14
Abundance In Sun
~0.000003 %   
17
~0.000005 %   
15
Abundance In Meteorites
0.00 %   
19
0.00 %   
15
Abundance In Earth's Crust
0.01 %   
18
0.04 %   
10
Abundance In Oceans
0.00 %   
7
0.00 %   
4
Abundance In Humans
0.00 %   
7
0.00 %   
7
Uses
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.
  
  • Strontium metal is used to producing ferrite magnets as well as refining zinc.
  • By-product of nuclear reactors called Strontium-90 is a radioactive isotope; it is absorbed by tissues and destroys bone marrow and cancer growth.
  
Industrial Uses
NA   
Ammunition Industry, Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Non Toxic   
Non Toxic   
Present in Human Body
Yes   
Yes   
In Blood
2.49 Blood/mg dm-3   
7
0.03 Blood/mg dm-3   
19
In Bone
5.00 p.p.m.   
13
140.00 p.p.m.   
7
Physical Properties
Melting Point
38.89 °C   
99+
769.00 °C   
99+
Boiling Point
688.00 °C   
99+
1,384.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Grayish White   
Silvery White   
Luster
NA   
Metallic   
Hardness
  
  
Mohs Hardness
0.30   
24
1.50   
18
Brinell Hardness
0.22 MPa   
99+
Not Available   
Speed of Sound
1,300.00 m/s   
99+
Not Available   
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
Rb   
Sr   
Isotopes
  
  
Known Isotopes
29   
10
27   
12
Electronegativity
  
  
Pauling Electronegativity
0.82   
99+
0.95   
99+
Sanderson Electronegativity
0.31   
32
0.72   
27
Allred Rochow Electronegativity
0.89   
40
0.99   
37
Mulliken-Jaffe Electronegativity
0.69   
24
1.00   
18
Allen Electronegativity
0.71   
99+
0.96   
40
Electropositivity
  
  
Pauling Electropositivity
3.18   
3
3.05   
7
Ionization Energies
  
  
1st Energy Level
403.00 kJ/mol   
99+
549.50 kJ/mol   
99+
2nd Energy Level
2,633.00 kJ/mol   
6
1,064.20 kJ/mol   
99+
3rd Energy Level
3,860.00 kJ/mol   
11
4,138.00 kJ/mol   
10
4th Energy Level
5,080.00 kJ/mol   
18
5,500.00 kJ/mol   
13
5th Energy Level
6,850.00 kJ/mol   
19
6,910.00 kJ/mol   
18
6th Energy Level
8,140.00 kJ/mol   
20
8,760.00 kJ/mol   
18
7th Energy level
9,570.00 kJ/mol   
20
10,230.00 kJ/mol   
19
8th Energy Level
13,120.00 kJ/mol   
17
11,800.00 kJ/mol   
19
9th Energy Level
14,500.00 kJ/mol   
18
15,600.00 kJ/mol   
17
10th Energy Level
26,740.00 kJ/mol   
6
17,100.00 kJ/mol   
19
11th Energy Level
Not Available   
31,270.00 kJ/mol   
6
Electrochemical Equivalent
3.19 g/amp-hr   
14
1.64 g/amp-hr   
99+
Electron Work Function
2.16 eV   
99+
2.59 eV   
99+
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity   
Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Atomic Properties
Atomic Number
37   
99+
38   
99+
Electron Configuration
[Kr] 5s1   
[Kr] 5s2   
Crystal Structure
Body Centered Cubic (BCC)   
Face Centered Cubic (FCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
FCC-Crystal-Structure-of-Strontium.jpg#100   
Atom
  
  
Number of Protons
37   
99+
38   
99+
Number of Neutrons
48   
99+
50   
99+
Number of Electrons
37   
99+
38   
99+
Radius of an Atom
  
  
Atomic Radius
248.00 pm   
2
215.00 pm   
5
Covalent Radius
220.00 pm   
4
195.00 pm   
15
Van der Waals Radius
303.00 pm   
3
249.00 pm   
7
Atomic Weight
85.47 amu   
99+
87.62 amu   
99+
Atomic Volume
55.90 cm3/mol   
2
33.70 cm3/mol   
6
Adjacent Atomic Numbers
  
  
Previous Element
Gallium
  
Rubidium
  
Next Element
Strontium
  
Yttrium
  
Valence Electron Potential
9.47 (-eV)   
99+
25.70 (-eV)   
99+
Lattice Constant
558.50 pm   
10
608.49 pm   
6
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
1.53 g/cm3   
99+
2.64 g/cm3   
99+
Density When Liquid (at m.p.)
1.46 g/cm3   
99+
2.38 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
121.00 (Pa)   
1
Elasticity properties
  
  
Shear Modulus
Not Available   
6.03 GPa   
99+
Bulk Modulus
2.50 GPa   
99+
Not Available   
Young's Modulus
2.40 GPa   
99+
15.70 GPa   
99+
Poisson Ratio
Not Available   
0.28   
17
Other Mechanical Properties
Ductile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
1.53   
99+
2.64   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
128.00 nΩ·m   
26
132.00 nΩ·m   
24
Electrical Conductivity
0.08 106/cm Ω   
24
0.08 106/cm Ω   
26
Electron Affinity
46.90 kJ/mol   
24
5.03 kJ/mol   
38
Thermal Properties
Specific Heat
0.36 J/(kg K)   
17
0.30 J/(kg K)   
18
Molar Heat Capacity
31.06 J/mol·K   
5
26.40 J/mol·K   
28
Thermal Conductivity
58.20 W/m·K   
26
35.40 W/m·K   
37
Critical Temperature
2,093.00 K   
4
Not Available   
Thermal Expansion
90.00 µm/(m·K)   
2
22.50 µm/(m·K)   
18
Enthalpy
  
  
Enthalpy of Vaporization
69.20 kJ/mol   
99+
150.00 kJ/mol   
99+
Enthalpy of Fusion
2.19 kJ/mol   
99+
9.16 kJ/mol   
38
Enthalpy of Atomization
82.00 kJ/mol   
99+
163.20 kJ/mol   
99+
Standard Molar Entropy
76.80 J/mol.K   
5
55.00 J/mol.K   
26
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