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 Atomic No. Order:
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 Alphabetic Order:
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  2, 8, 18,  

  30,  8, 2  

 

 

Er
68		Fm
100		Upn
150		Bnn
200		  

Erbium

SymbolEr
Atomic Number68
Relative Atomic Mass
12C = 12.0000		167.259
Atomic Radius  pm176
First Ionisation Energy
kJ mol -1		588.7
Electronegativity1.24
Density  kg m -39066 [298 K]
Molar Volume   cm 318.44
Thermal Conductivity
W m -1 K -1		14.3 [300 K]
Melting Point  K1802
Boiling Point  K3136
Number of Isotopes25
Inner/outer Shells
  3  +  3   =6
Inner/outer Orbitals
  28  +  40   =68
Filling Orbital
  4f 12   
Ground State Electron Configuration
[Xe]  4f 12     5p 6    6s 2    
Ground State Electron Configuration with free Orbitals (n=18)

 

  0, 0, 0, 2, 10, 6  

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Ground State Electron Configuration with compressed Orbitals (n=96)

 

  0, 0, 0, 0, 32, 64  

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Singularity
182= 28+40+18+96
 
 
s
p
d
 f
g
h
i
j
1
2
       
2
2
6
      
3
2
6
10
     
4
2
6
10

12

2    
5
2
6
10

14

18
   
6

2

6
10

14

18
22
  
7
        
8
        
 
Term Symbol3 H 6
DiscoveryDiscovered by C.G. Mosander (Stockholm, Sweden) in 1842
Name Derived FromNamed after Ytterby, Sweden
 

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APSIDIUM  ©  Created:    

2002-08-08

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2005-01-18