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Atomic Structure of Lanthanum and Protactinium


Atomic Structure of Protactinium and Lanthanum


Atomic Properties

Atomic Number
57   
99+
91   
27

Electron Configuration
[Xe] 5d2 6s2   
[Rn] 5f2 6d1 7s2   

Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Tetragonal (TETR)   

Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   
TETR-Crystal-Structure-of-Protactinium.jpg#100   

Atom
  
  

Number of Protons
57   
99+
91   
27

Number of Neutrons
82   
99+
122   
21

Number of Electrons
57   
99+
91   
27

Radius of an Atom
  
  

Atomic Radius
187.00 pm   
8
163.00 pm   
25

Covalent Radius
207.00 pm   
6
200.00 pm   
11

Van der Waals Radius
240.00 pm   
13
243.00 pm   
11

Atomic Weight
138.91 amu   
99+
231.04 amu   
24

Atomic Volume
20.73 cm3/mol   
16
15.00 cm3/mol   
34

Adjacent Atomic Numbers
  
  

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Barium
  
Thorium
  

Next Element
Cerium
  
Uranium
  

Valence Electron Potential
40.71 (-eV)   
99+
92.00 (-eV)   
11

Lattice Constant
377.20 pm   
28
392.50 pm   
23

Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   

Lattice C/A Ratio
1.62   
2
Not Available   

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