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Atomic Structure of Lanthanum and Thallium

Lanthanum
Thallium
Atomic Structure of Thallium and Lanthanum


Atomic Properties
Atomic Number
57   
99+
81   
35
Electron Configuration
[Xe] 5d2 6s2   
[Xe] 4f14 5d10 6s2 6p1   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
57   
99+
81   
35
Number of Neutrons
82   
99+
123   
20
Number of Electrons
57   
99+
81   
35
Radius of an Atom
  
  
Atomic Radius
187.00 pm   
8
170.00 pm   
22
Covalent Radius
207.00 pm   
6
145.00 pm   
39
Van der Waals Radius
240.00 pm   
13
196.00 pm   
30
Atomic Weight
138.91 amu   
99+
204.38 amu   
31
Atomic Volume
20.73 cm3/mol   
16
17.20 cm3/mol   
31
Adjacent Atomic Numbers
  
  
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Barium
  
Mercury
  
Next Element
Cerium
  
Lead
  
Valence Electron Potential
40.71 (-eV)   
99+
9.60 (-eV)   
99+
Lattice Constant
377.20 pm   
28
345.66 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
1.62   
2
1.60   
6
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