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Atomic Structure of Promethium and Protactinium

Promethium
Protactinium
Atomic Structure of Protactinium and Promethium


Atomic Properties
Atomic Number
61   
99+
91   
27
Electron Configuration
[Xe] 4f5 6s2   
[Rn] 5f2 6d1 7s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Tetragonal (TETR)   
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100   
TETR-Crystal-Structure-of-Protactinium.jpg#100   
Atom
  
  
Number of Protons
61   
99+
91   
27
Number of Neutrons
84   
40
122   
21
Number of Electrons
61   
99+
91   
27
Radius of an Atom
  
  
Atomic Radius
183.00 pm   
10
163.00 pm   
25
Covalent Radius
199.00 pm   
12
200.00 pm   
11
Van der Waals Radius
236.00 pm   
16
243.00 pm   
11
Atomic Weight
145.00 amu   
99+
231.04 amu   
24
Atomic Volume
22.39 cm3/mol   
12
15.00 cm3/mol   
34
Adjacent Atomic Numbers
  
  
Previous Element
Neodymium
  
Thorium
  
Next Element
Samarium
  
Uranium
  
Valence Electron Potential
44.10 (-eV)   
39
92.00 (-eV)   
11
Lattice Constant
Not Available   
392.50 pm   
23
Lattice Angles
Unknown   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
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