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Atomic Structure of Americium and Protactinium

Americium
Protactinium
Atomic Structure of Protactinium and Americium


Atomic Properties
Atomic Number
95   
23
91   
27
Electron Configuration
[Rn] 5f7 7s2   
[Rn] 5f2 6d1 7s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Tetragonal (TETR)   
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100   
TETR-Crystal-Structure-of-Protactinium.jpg#100   
Atom
  
  
Number of Protons
95   
23
91   
27
Number of Neutrons
148   
12
122   
21
Number of Electrons
95   
23
91   
27
Radius of an Atom
  
  
Atomic Radius
173.00 pm   
21
163.00 pm   
25
Covalent Radius
180.00 pm   
21
200.00 pm   
11
Van der Waals Radius
244.00 pm   
10
243.00 pm   
11
Atomic Weight
243.00 amu   
20
231.04 amu   
24
Atomic Volume
17.86 cm3/mol   
29
15.00 cm3/mol   
34
Adjacent Atomic Numbers
  
  
Previous Element
Plutonium
  
Thorium
  
Next Element
Curium
  
Uranium
  
Valence Electron Potential
44.00 (-eV)   
40
92.00 (-eV)   
11
Lattice Constant
346.81 pm   
99+
392.50 pm   
23
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
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