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 Atomic No. Order:
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 Alphabetic Order:
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Periodic Table

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  2, 8,  

  15, 2  

 

 

Co
27 		  Rh
45 		  Ir
77 		Mt
109 		Upe
159 		Bne
209

Cobalt

Symbol Co
Atomic Number 27
Relative Atomic Mass
12C = 12.0000 		58.933 200 (±9) [Since 1995]
Atomic Radius pm 125
First Ionisation Energy
kJ mol -1 		760.0
Ionisation Energy (eV)  7.8810
Electronegativity 1.88
Density kg m -3 8900 [293 K]
7970 [m.p.]
Molar Volume cm 3 6.62
Thermal Conductivity
W m -1 K -1 		100 [300 K]
Melting Point K 1768
Boiling Point K 3143
Number of Isotopes 17
Isotope Atomic mass/u Mole fraction 59Co 58.933 1999(15) 1.0000
Inner + outer Shells
  2   +   2    = 4
Inner + outer Orbitals
  10   +   17    = 27
Filling Orbital
  3d 7   
Ground State Electron
Configuration
[Ar]   3d 7    4s 2 
Ground State Electron
Configuration with
free Orbitals (n= 9)

 

  0, 0, 3, 6  

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Ground State Electron
Configuration with
compressed Orbitals (n= 24)

 

  0, 0, 0, 24  

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Singularity
60 =  10 + 17 + 9 + 24
 
  s p d  f g h i j
1 2              
2 2 6            
3 2 6 7 3          
4 2 6 10

14

       
5                
6                
7                
 
Term Symbol 4F 9/2
Discovery It was discovered in 1735 by the Swedish chemist Georg Brandt (Stockholm, Sweden).
Name Derived From The name derives from the German Kobald for "evil spirits or goblins", who were superstitiously thought to cause trouble for miners because the mineral contained arsenic that injured their health and the metallic ores did not yield metals when treated with the normal methods.
 

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2002-06-01

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