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Rubidium vs Radium

Rubidium
Radium
Radium vs Rubidium


Periodic Table
Symbol
Rb  
Ra  
Group Number
1  
17
2  
16
Period Number
5  
7  
Block
s block  
s block  
Element Family
Alkali  
Alkaline Earth  
CAS Number
7440177  
99+
7440144  
99+
Space Group Name
Im_ 3m  
Im_ 3m  
Space Group Number
229.00  
2
229.00  
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.
  
  • Radium metal is the heaviest metal of Alkaline earth metals column.
  • Radium metal is highly radioactive and does not have any stable isotopes.
  
Sources
Obtained from Lithium Production.  
Mining, Ores of metals  
History
  
  
Who Discovered
Robert Bunsen and Gustav Kirchhoff  
-  
Discovery
In 1861  
In 1898  
Abundance
  
  
Abundance In Universe
0.00 %  
17
0.00 %  
40
Abundance In Sun
0.00 %  
17
0.00 %  
26
Abundance In Meteorites
0.00 %  
19
-  
Abundance In Earth's Crust
0.01 %  
18
0.00 %  
99+
Abundance In Oceans
0.00 %  
7
0.00 %  
99+
Abundance In Humans
0.00 %  
8
0.00 %  
23
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.
  
  • It is a highly radioactive metal; and sometime Radium-223 is used to treat prostate cancer.
  • It is used in luminous paints.
  
Industrial Uses
-  
-  
Medical Uses
-  
Pharmaceutical Industry  
Other Uses
Alloys, Research Purposes  
-  
Biological Properties
  
  
Toxicity
Non Toxic  
Highly Toxic  
Present in Human Body
Yes  
No  
In Blood
2.49 Blood/mg dm-3  
7
0.00 Blood/mg dm-3  
34
In Bone
5.00 p.p.m.  
13
0.00 p.p.m.  
99+
Physical
Melting Point
38.89 °C  
99+
700.00 °C  
99+
Boiling Point
688.00 °C  
99+
1,737.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Grayish White  
Silvery White  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
0.30  
26
1.00  
22
Brinell Hardness
0.22 MPa  
99+
700.00 MPa  
17
Vickers Hardness
0.22 MPa  
99+
140.00 MPa  
99+
Speed of Sound
1,300.00 m/s  
99+
3,150.00 m/s  
37
Optical Properties
  
  
Refractive Index
1.54  
35
1.00  
99+
Reflectivity
52.00 %  
29
83.00 %  
6
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rb  
Ra  
Isotopes
  
  
Known Isotopes
29  
10
33  
6
Electronegativity
  
  
Pauling Electronegativity
0.82  
99+
0.90  
99+
Sanderson Electronegativity
0.31  
99+
0.89  
99+
Allred Rochow Electronegativity
0.89  
99+
0.97  
39
Mulliken-Jaffe Electronegativity
0.69  
99+
0.92  
99+
Allen Electronegativity
0.71  
99+
0.89  
99+
Electropositivity
  
  
Pauling Electropositivity
3.18  
3
3.10  
5
Ionization Energies
  
  
1st Energy Level
403.00 kJ/mol  
99+
509.30 kJ/mol  
99+
2nd Energy Level
2,633.00 kJ/mol  
6
979.00 kJ/mol  
99+
3rd Energy Level
3,860.00 kJ/mol  
11
509.30 kJ/mol  
99+
4th Energy Level
5,080.00 kJ/mol  
28
5,093.00 kJ/mol  
27
5th Energy Level
6,850.00 kJ/mol  
31
5,090.00 kJ/mol  
99+
6th Energy Level
8,140.00 kJ/mol  
31
5,090.00 kJ/mol  
99+
7th Energy level
9,570.00 kJ/mol  
20
5,090.00 kJ/mol  
99+
8th Energy Level
13,120.00 kJ/mol  
17
5,090.00 kJ/mol  
99+
9th Energy Level
14,500.00 kJ/mol  
18
5,090.00 kJ/mol  
99+
10th Energy Level
26,740.00 kJ/mol  
6
5,090.00 kJ/mol  
99+
11th Energy Level
4,030.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
12th Energy Level
4,030.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
13th Energy Level
4,030.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
14th Energy Level
4,030.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
15th Energy Level
40,300.00 kJ/mol  
99+
50,900.00 kJ/mol  
99+
16th Energy Level
40,300.00 kJ/mol  
99+
50,900.00 kJ/mol  
99+
17th Energy Level
403.00 kJ/mol  
99+
509.30 kJ/mol  
99+
18th Energy Level
4,030.00 kJ/mol  
99+
5,090.00 kJ/mol  
99+
19th Energy Level
403.00 kJ/mol  
99+
509.30 kJ/mol  
99+
20th Energy Level
403.00 kJ/mol  
99+
509.00 kJ/mol  
99+
21st Energy Level
403.00 kJ/mol  
99+
509.30 kJ/mol  
99+
22nd Energy Level
403.00 kJ/mol  
99+
509.00 kJ/mol  
99+
23rd Energy Level
403.00 kJ/mol  
99+
509.30 kJ/mol  
99+
24th Energy Level
403.00 kJ/mol  
99+
509.30 kJ/mol  
99+
25th Energy Level
403.00 kJ/mol  
99+
509.00 kJ/mol  
99+
26th Energy Level
403.00 kJ/mol  
99+
509.30 kJ/mol  
99+
27th Energy Level
403.00 kJ/mol  
99+
509.30 kJ/mol  
99+
28th Energy Level
403.00 kJ/mol  
99+
509.30 kJ/mol  
99+
29th Energy Level
403.00 kJ/mol  
99+
509.30 kJ/mol  
99+
30th Energy Level
403.00 kJ/mol  
99+
509.00 kJ/mol  
99+
Electrochemical Equivalent
3.19 g/amp-hr  
16
4.22 g/amp-hr  
6
Electron Work Function
2.16 eV  
99+
4.30 eV  
25
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
37  
99+
88  
30
Electron Configuration
[Kr] 5s1  
[Rn] 7s2  
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
37  
99+
88  
30
Number of Neutrons
48  
99+
138  
17
Number of Electrons
37  
99+
88  
30
Radius of an Atom
  
  
Atomic Radius
248.00 pm  
3
215.00 pm  
6
Covalent Radius
220.00 pm  
4
221.00 pm  
3
Van der Waals Radius
303.00 pm  
4
283.00 pm  
5
Atomic Weight
85.47 amu  
99+
226.00 amu  
26
Atomic Volume
55.90 cm3/mol  
3
45.20 cm3/mol  
5
Adjacent Atomic Numbers
  
  
Previous Element
Gallium
  
Francium
  
Next Element
Strontium
  
Actinium
  
Valence Electron Potential
9.47 (-eV)  
99+
20.10 (-eV)  
99+
Lattice Constant
558.50 pm  
11
514.80 pm  
15
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.59  
28
1.57  
99+
Mechanical
Density
  
  
Density At Room Temperature
1.53 g/cm3  
99+
5.50 g/cm3  
99+
Density When Liquid (at m.p.)
1.46 g/cm3  
99+
5.50 g/cm3  
99+
Tensile Strength
30.00 MPa  
99+
40.00 MPa  
99+
Viscosity
0.00  
23
0.00  
2
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
16
Vapor Pressure at 2000 K
0.00 (Pa)  
35
0.00 (Pa)  
33
Elasticity properties
  
  
Shear Modulus
2.50 GPa  
99+
25.00 GPa  
38
Bulk Modulus
2.50 GPa  
99+
43.00 GPa  
33
Young's Modulus
2.40 GPa  
99+
83.00 GPa  
25
Poisson Ratio
0.37  
7
0.31  
13
Other Mechanical Properties
Ductile  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
1.53  
99+
5.00  
99+
Magnetic Ordering
Paramagnetic  
Nonmagnetic  
Permeability
0.00 H/m  
11
0.00 H/m  
9
Susceptibility
0.00  
24
0.00  
18
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
128.00 nΩ·m  
26
100.00 nΩ·m  
31
Electrical Conductivity
0.08 106/cm Ω  
29
0.00 106/cm Ω  
99+
Electron Affinity
46.90 kJ/mol  
29
0.90 kJ/mol  
99+
Thermal
Specific Heat
0.36 J/(kg K)  
17
0.12 J/(kg K)  
99+
Molar Heat Capacity
31.06 J/mol·K  
7
20.05 J/mol·K  
99+
Thermal Conductivity
58.20 W/m·K  
26
18.60 W/m·K  
99+
Critical Temperature
2,093.00 K  
18
973.00 K  
99+
Thermal Expansion
90.00 µm/(m·K)  
2
8.50 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
69.20 kJ/mol  
99+
113.00 kJ/mol  
99+
Enthalpy of Fusion
2.19 kJ/mol  
99+
8.60 kJ/mol  
99+
Enthalpy of Atomization
82.00 kJ/mol  
99+
163.00 kJ/mol  
99+
Standard Molar Entropy
76.80 J/mol.K  
5
71.00 J/mol.K  
14
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