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Atomic Structure of Promethium and 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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