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Atomic Structure of Promethium and Thulium

Promethium
Thulium
Atomic Structure of Thulium and Promethium


Atomic Properties
Atomic Number
61   
99+
69   
99+
Electron Configuration
[Xe] 4f5 6s2   
[Xe] 4f13 6s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100   
HCP-Crystal-Structure-of-Thulium.jpg#100   
Atom
  
  
Number of Protons
61   
99+
69   
99+
Number of Neutrons
84   
40
100   
32
Number of Electrons
61   
99+
69   
99+
Radius of an Atom
  
  
Atomic Radius
183.00 pm   
10
176.00 pm   
18
Covalent Radius
199.00 pm   
12
160.00 pm   
30
Van der Waals Radius
236.00 pm   
16
Not Available   
Atomic Weight
145.00 amu   
99+
168.93 amu   
99+
Atomic Volume
22.39 cm3/mol   
12
18.10 cm3/mol   
28
Adjacent Atomic Numbers
  
  
Previous Element
Neodymium
  
Erbium
  
Next Element
Samarium
  
Ytterbium
  
Valence Electron Potential
44.10 (-eV)   
39
49.70 (-eV)   
28
Lattice Constant
Not Available   
353.75 pm   
40
Lattice Angles
Unknown   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.57   
17
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