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Atomic Structure of Thallium and Lanthanum

Thallium
Lanthanum
Atomic Structure of Lanthanum and Thallium


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