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Atomic Structure of Lanthanum and Technetium

Lanthanum
Technetium
Atomic Structure of Technetium and Lanthanum


Atomic Properties
Atomic Number
57   
99+
43   
99+
Electron Configuration
[Xe] 5d2 6s2   
[Kr] 4d5 5s2   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   
HCP-Crystal-Structure-of-Technetium.jpg#100   
Atom
  
  
Number of Protons
57   
99+
43   
99+
Number of Neutrons
82   
99+
55   
99+
Number of Electrons
57   
99+
43   
99+
Radius of an Atom
  
  
Atomic Radius
187.00 pm   
8
136.00 pm   
99+
Covalent Radius
207.00 pm   
6
147.00 pm   
37
Van der Waals Radius
240.00 pm   
13
200.00 pm   
28
Atomic Weight
138.91 amu   
99+
98.00 amu   
99+
Atomic Volume
20.73 cm3/mol   
16
8.50 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Barium
  
Molybdenum
  
Next Element
Cerium
  
Ruthenium
  
Valence Electron Potential
40.71 (-eV)   
99+
180.00 (-eV)   
3
Lattice Constant
377.20 pm   
28
273.50 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   
5
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