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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

Symbol Er
Atomic Number 68
Relative Atomic Mass
12C = 12.0000 		167.259
Atomic Radius  pm 176
First Ionisation Energy
kJ mol -1 		588.7
Electronegativity 1.24
Density  kg m -3 9066 [298 K]
Molar Volume   cm 3 18.44
Thermal Conductivity
W m -1 K -1 		14.3 [300 K]
Melting Point  K 1802
Boiling Point  K 3136
Number of Isotopes 25
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 Symbol 3 H 6
Discovery Discovered by C.G. Mosander (Stockholm, Sweden) in 1842
Name Derived From Named after Ytterby, Sweden
 

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APSIDIUM  ©   Created:     

2002-08-08

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