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Atomic Structure of Lanthanum and 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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