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Atomic Structure of Erbium and Promethium

Erbium
Promethium
Atomic Structure of Promethium and Erbium


Atomic Properties
Atomic Number
68   
99+
61   
99+
Electron Configuration
[Xe] 4f12 6s2   
[Xe] 4f5 6s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
HCP-Crystal-Structure-of-Erbium.jpg#100   
DHCP-Crystal-Structure-of-Promethium.jpg#100   
Atom
  
  
Number of Protons
68   
99+
61   
99+
Number of Neutrons
99   
33
84   
40
Number of Electrons
68   
99+
61   
99+
Radius of an Atom
  
  
Atomic Radius
176.00 pm   
18
183.00 pm   
10
Covalent Radius
189.00 pm   
19
199.00 pm   
12
Van der Waals Radius
Not Available   
236.00 pm   
16
Atomic Weight
167.26 amu   
99+
145.00 amu   
99+
Atomic Volume
18.40 cm3/mol   
25
22.39 cm3/mol   
12
Adjacent Atomic Numbers
  
  
Previous Element
Holmium
  
Neodymium
  
Next Element
Thulium
  
Samarium
  
Valence Electron Potential
49.00 (-eV)   
29
44.10 (-eV)   
39
Lattice Constant
355.88 pm   
39
Not Available   
Lattice Angles
π/2, π/2, 2 π/3   
Unknown   
Lattice C/A Ratio
1.57   
17
Not Available   
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