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Atomic Structure of Thulium and Lanthanum


Atomic Structure of Lanthanum and Thulium


Atomic Properties

Atomic Number
69   
99+
57   
99+

Electron Configuration
[Xe] 4f13 6s2   
[Xe] 5d2 6s2   

Crystal Structure
Hexagonal Close Packed (HCP)   
Double Hexagonal Close Packed (DHCP)   

Crystal Lattice
HCP-Crystal-Structure-of-Thulium.jpg#100   
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   

Atom
  
  

Number of Protons
69   
99+
57   
99+

Number of Neutrons
100   
32
82   
99+

Number of Electrons
69   
99+
57   
99+

Radius of an Atom
  
  

Atomic Radius
176.00 pm   
18
187.00 pm   
8

Covalent Radius
160.00 pm   
30
207.00 pm   
6

Van der Waals Radius
Not Available   
240.00 pm   
13

Atomic Weight
168.93 amu   
99+
138.91 amu   
99+

Atomic Volume
18.10 cm3/mol   
28
20.73 cm3/mol   
16

Adjacent Atomic Numbers
  
  

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Next Element
Ytterbium
  
Cerium
  

Valence Electron Potential
49.70 (-eV)   
28
40.71 (-eV)   
99+

Lattice Constant
353.75 pm   
40
377.20 pm   
28

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

Lattice C/A Ratio
1.57   
17
1.62   
2

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