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Atomic Structure of Lanthanum and Promethium

Lanthanum
Promethium
Atomic Structure of Promethium and Lanthanum


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