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Atomic Structure of Lanthanum and Barium

Lanthanum
Barium
Atomic Structure of Barium and Lanthanum


Atomic Properties
Atomic Number
57   
99+
56   
99+
Electron Configuration
[Xe] 5d2 6s2   
[Xe] 6s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Body Centered Cubic (BCC)   
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
57   
99+
56   
99+
Number of Neutrons
82   
99+
81   
99+
Number of Electrons
57   
99+
56   
99+
Radius of an Atom
  
  
Atomic Radius
187.00 pm   
8
222.00 pm   
4
Covalent Radius
207.00 pm   
6
215.00 pm   
5
Van der Waals Radius
240.00 pm   
13
268.00 pm   
6
Atomic Weight
138.91 amu   
99+
137.33 amu   
99+
Atomic Volume
20.73 cm3/mol   
16
39.24 cm3/mol   
5
Adjacent Atomic Numbers
  
  
Previous Element
Barium
  
Cesium
  
Next Element
Cerium
  
Lanthanum
  
Valence Electron Potential
40.71 (-eV)   
99+
21.30 (-eV)   
99+
Lattice Constant
377.20 pm   
28
502.80 pm   
15
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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