Picture of Boron
    

 Atomic No. Order:
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 Alphabetic Order:
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Periodic Table

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  2,  

  3  

 

 

B
5 		Al
13 		Ga
31 		In
49 		Tl
81 		Uut
113 		Uht
163 		But
213

Boron

Symbol B
Atomic Number 5
Relative Atomic Mass
12C = 12.0000 		10.811
Atomic Radius  pm 88
First Ionisation Energy
kJ mol -1 		800.6
Ionization energy (eV) 8,2980
Electronegativity 2.04
Density   kg m -3 2340 (²-rhomb.) [293 K]
Molar Volume   cm 3 4.62
Thermal Conductivity
W m -1 K -1 		27.0 [300 K]
Melting Point  K 2573
Boiling Point  K 3931
Number of Isotopes 6
Inner + outer Shells
  1   +   1    = 2
Inner + outer Orbitals
  2   +   3    = 5
Filling Orbital
  2p 1   
Ground State Electron
Configuration 
[He] 2s 2    2p 1       
Ground State Electron
Co nfiguration with
free Orbitals (n= 5)
 

  0, 5  

 

Ground State Electron Configuration with free Orbitals of Boron
Ground State Electron
Configuration with
compressed Orbitals (n=0)
 

  0, 0  

 

Ground State Electron Configuration with compressed Orbitals of Boron

Singularity

10 =  2 + 3 + 5 + 0
  s p d  f g h i j
1 2              
2 2 1 5            
3                
4                
5                
6                
7                
8                
 
Term Symbol 2P 1/2
Discovery Discovered by L.J. Thenard and L.J. Lussac (Paris, France) and Sir H. Davey (London, England) in 1808
Name Derived From Arabic buraq
 

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2002-06-04

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