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Atomic Structure of Promethium and Lanthanum

Promethium
Lanthanum
Atomic Structure of Lanthanum and Promethium


Atomic Properties
Atomic Number
61   
99+
57   
99+
Electron Configuration
[Xe] 4f5 6s2   
[Xe] 5d2 6s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Double Hexagonal Close Packed (DHCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100   
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   
Atom
  
  
Number of Protons
61   
99+
57   
99+
Number of Neutrons
84   
40
82   
99+
Number of Electrons
61   
99+
57   
99+
Radius of an Atom
  
  
Atomic Radius
183.00 pm   
10
187.00 pm   
8
Covalent Radius
199.00 pm   
12
207.00 pm   
6
Van der Waals Radius
236.00 pm   
16
240.00 pm   
13
Atomic Weight
145.00 amu   
99+
138.91 amu   
99+
Atomic Volume
22.39 cm3/mol   
12
20.73 cm3/mol   
16
Adjacent Atomic Numbers
  
  
Previous Element
Neodymium
  
Barium
  
Next Element
Samarium
  
Cerium
  
Valence Electron Potential
44.10 (-eV)   
39
40.71 (-eV)   
99+
Lattice Constant
Not Available   
377.20 pm   
28
Lattice Angles
Unknown   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.62   
2
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