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Atomic Structure of Americium and 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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