Extended Periodic Table
      

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Periodic Table

Ground State Electron Configuration

  2, 8, 18,  

  8, 1  

 

 

  H
  1 		Li
3 		Na
11 		  K
19 		Rb
37 		Cs
55 		  Fr
 87 		Uue
119 		Uhe
169 		Bue
219

Rubidium

Symbol Rb
Atomic Number 37
Relative Atomic Mass
12C = 12.0000 		85.4678  (±3) [Since 1969]
Atomic Radius  pm 247.5
First Ionisation Energy
kJ mol -1 		403.0
Ionisation Energy (eV) 4.1771
Electronegativity 0.82
Density
kg m -3 		1532 [293 K]
1475 [l., m.p.]
Molar Volume  cm 3 55.79
Thermal Conductivity
W m -1 K -1 		58.2 [300 K]
Melting Point  K 312.2
Boiling Point   K 961
Number of Isotopes 30
Isotope Atomic mass/u Mole fraction 85Rb 84.911 7924(27) 0.7217(2)
87Rb 86.909 1858(28) 0.2783(2)
Inner + outer Shells
  3   +   2    = 5
Inner + outer Orbitals
  28   +   9    = 37
Filling Orbital
  5s 1   
Ground State Electron
Configuration
[Kr]   5s 1       
Ground State Electron
Configuration with
free Orbitals (n=17)

 

  0, 0, 0, 10, 7  

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Ground State Electron
Configuration with
compressed Orbitals (n=56)

 

  0, 0, 0, 14, 42  

[Picture]
 
Singularity
110 =  28 + 9 + 17 + 56
 
 
s
p
d
 f
g
h
i
j
1
2
             
2
2
6
           
3
2
6
10
         
4
2
6
10

14

       
5
1 1 6

10

14

18
     
6
               
7
               
8
               
  
Term Symbol 2S 1/2
Discovery It was discovered in the mineral lepidolite by the German chemist Robert Wilhelm Bunsen (University of Heidelberg, Germany) and the German physicist Gustav-Robert Kirchoff in 1861. Bunsen isolated rubidium in 1863.
 
Name Derived From The name derives from the Latin rubidus for deepest red because of the two "deep red lines" in its spectra.
 

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